diff --git a/modules/openapi-generator/src/main/resources/swift6/api.mustache b/modules/openapi-generator/src/main/resources/swift6/api.mustache
index 1ea5b5607946..9eecf88a575c 100644
--- a/modules/openapi-generator/src/main/resources/swift6/api.mustache
+++ b/modules/openapi-generator/src/main/resources/swift6/api.mustache
@@ -32,7 +32,7 @@ extension {{projectName}}API {
     /**
      * enum for parameter {{paramName}}
      */
-    {{#nonPublicApi}}internal{{/nonPublicApi}}{{^nonPublicApi}}public{{/nonPublicApi}} enum {{enumName}}_{{operationId}}: {{^isContainer}}{{{dataType}}}{{/isContainer}}{{#isContainer}}String{{/isContainer}}, CaseIterable{{#useVapor}}, Content{{/useVapor}} {
+    {{#nonPublicApi}}internal{{/nonPublicApi}}{{^nonPublicApi}}public{{/nonPublicApi}} enum {{enumName}}_{{operationId}}: {{^isContainer}}{{{dataType}}}{{/isContainer}}{{#isContainer}}String{{/isContainer}}, Sendable, CaseIterable{{#useVapor}}, Content{{/useVapor}} {
         {{^enumUnknownDefaultCase}}
         {{#allowableValues}}
         {{#enumVars}}
diff --git a/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
index 40e7ae87fbd1..5e8864e85ea5 100644
--- a/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -411,7 +411,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -419,7 +419,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -428,7 +428,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -436,7 +436,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -445,7 +445,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -453,7 +453,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -461,7 +461,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -469,7 +469,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
index 5d03cf93ff4e..ffa55fa3bcf6 100644
--- a/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -114,7 +114,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/FakeAPI.swift
index 8548c9d3e213..26525de39e26 100644
--- a/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -1268,7 +1268,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -1276,7 +1276,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -1285,7 +1285,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -1293,7 +1293,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -1302,7 +1302,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -1310,7 +1310,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -1318,7 +1318,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -1326,7 +1326,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/PetAPI.swift
index 61cd0b04916b..c194af440e45 100644
--- a/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -330,7 +330,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
index 064e28b98ca6..f6d85eaf0b53 100644
--- a/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -355,7 +355,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -363,7 +363,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -372,7 +372,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -380,7 +380,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -389,7 +389,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -397,7 +397,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -405,7 +405,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -413,7 +413,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
index 4cb91830b4dd..054a24e3abb5 100644
--- a/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -100,7 +100,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift b/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
index 349d7fc51c25..47a6884488b1 100644
--- a/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
@@ -518,7 +518,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -526,7 +526,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -535,7 +535,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -543,7 +543,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -552,7 +552,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -560,7 +560,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -568,7 +568,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -576,7 +576,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift b/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
index 13facaf8462b..94ddf898e2b1 100644
--- a/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
@@ -143,7 +143,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/FakeAPI.swift b/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/FakeAPI.swift
index 72e1ba9b7665..bd77aa2f1159 100644
--- a/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/FakeAPI.swift
@@ -502,7 +502,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -510,7 +510,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -519,7 +519,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -527,7 +527,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -536,7 +536,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -544,7 +544,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -552,7 +552,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -560,7 +560,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/PetAPI.swift b/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/PetAPI.swift
index 52e06462861a..c86a7ade2814 100644
--- a/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/APIs/PetAPI.swift
@@ -139,7 +139,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/FakeAPI.swift
index 9d3e3a4ade7e..6bb85e2d91fe 100644
--- a/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -393,7 +393,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -401,7 +401,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -410,7 +410,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -418,7 +418,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -427,7 +427,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -435,7 +435,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -443,7 +443,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -451,7 +451,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/PetAPI.swift
index 79e51af03c8c..eca9439777b6 100644
--- a/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/default/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -97,7 +97,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/FakeAPI.swift
index 10f0902bf485..76c1d55c50c1 100644
--- a/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -411,7 +411,7 @@ import Foundation
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -419,7 +419,7 @@ import Foundation
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -428,7 +428,7 @@ import Foundation
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -436,7 +436,7 @@ import Foundation
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -445,7 +445,7 @@ import Foundation
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -453,7 +453,7 @@ import Foundation
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -461,7 +461,7 @@ import Foundation
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -469,7 +469,7 @@ import Foundation
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/PetAPI.swift
index 8aab10afd44e..4229f71788aa 100644
--- a/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -114,7 +114,7 @@ import Foundation
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift b/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
index 5d41eda71d2b..0d4dc2f7f6b1 100644
--- a/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
@@ -420,7 +420,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -428,7 +428,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -437,7 +437,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -445,7 +445,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -454,7 +454,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -462,7 +462,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -470,7 +470,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -478,7 +478,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift b/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
index 49c2cb23b53e..56af1eb1ae14 100644
--- a/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
@@ -117,7 +117,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift b/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
index a3a036328a7a..101c812e73ec 100644
--- a/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
@@ -411,7 +411,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    internal enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    internal enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -419,7 +419,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    internal enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    internal enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -428,7 +428,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    internal enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    internal enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -436,7 +436,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    internal enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    internal enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -445,7 +445,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    internal enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    internal enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -453,7 +453,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    internal enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    internal enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -461,7 +461,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    internal enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    internal enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -469,7 +469,7 @@ internal class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    internal enum EnumFormString_testEnumParameters: String, CaseIterable {
+    internal enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift b/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
index 6f3d13022e78..d0049c26822d 100644
--- a/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
@@ -114,7 +114,7 @@ internal class PetAPI {
     /**
      * enum for parameter status
      */
-    internal enum Status_findPetsByStatus: String, CaseIterable {
+    internal enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift b/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
index 6e0ec88f2015..60e8e223ad06 100644
--- a/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/FakeAPI.swift
@@ -460,7 +460,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -468,7 +468,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -477,7 +477,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -485,7 +485,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -494,7 +494,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -502,7 +502,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -510,7 +510,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -518,7 +518,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift b/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
index 50b53724c797..9212294bd2ba 100644
--- a/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/APIs/PetAPI.swift
@@ -127,7 +127,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
index e4091ba52a42..f580b54f406c 100644
--- a/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -414,7 +414,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -422,7 +422,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -431,7 +431,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -439,7 +439,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -448,7 +448,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable {
         case _1 = 1
         case number2 = -2
     }
@@ -456,7 +456,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -464,7 +464,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -472,7 +472,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
index c353281f7b4b..977022cc096a 100644
--- a/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -117,7 +117,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable {
         case available = "available"
         case pending = "pending"
         case sold = "sold"
diff --git a/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift b/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
index 66af99ea7215..c51e0c815762 100644
--- a/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
+++ b/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/FakeAPI.swift
@@ -499,7 +499,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderStringArray
      */
-    public enum EnumHeaderStringArray_testEnumParameters: String, CaseIterable, Content {
+    public enum EnumHeaderStringArray_testEnumParameters: String, Sendable, CaseIterable, Content {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -507,7 +507,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumHeaderString
      */
-    public enum EnumHeaderString_testEnumParameters: String, CaseIterable, Content {
+    public enum EnumHeaderString_testEnumParameters: String, Sendable, CaseIterable, Content {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -516,7 +516,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryStringArray
      */
-    public enum EnumQueryStringArray_testEnumParameters: String, CaseIterable, Content {
+    public enum EnumQueryStringArray_testEnumParameters: String, Sendable, CaseIterable, Content {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -524,7 +524,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryString
      */
-    public enum EnumQueryString_testEnumParameters: String, CaseIterable, Content {
+    public enum EnumQueryString_testEnumParameters: String, Sendable, CaseIterable, Content {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
@@ -533,7 +533,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryInteger
      */
-    public enum EnumQueryInteger_testEnumParameters: Int, CaseIterable, Content {
+    public enum EnumQueryInteger_testEnumParameters: Int, Sendable, CaseIterable, Content {
         case _1 = 1
         case number2 = -2
     }
@@ -541,7 +541,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumQueryDouble
      */
-    public enum EnumQueryDouble_testEnumParameters: Double, CaseIterable, Content {
+    public enum EnumQueryDouble_testEnumParameters: Double, Sendable, CaseIterable, Content {
         case _11 = 1.1
         case number12 = -1.2
     }
@@ -549,7 +549,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormStringArray
      */
-    public enum EnumFormStringArray_testEnumParameters: String, CaseIterable, Content {
+    public enum EnumFormStringArray_testEnumParameters: String, Sendable, CaseIterable, Content {
         case greaterThan = ">"
         case dollar = "$"
     }
@@ -557,7 +557,7 @@ open class FakeAPI {
     /**
      * enum for parameter enumFormString
      */
-    public enum EnumFormString_testEnumParameters: String, CaseIterable, Content {
+    public enum EnumFormString_testEnumParameters: String, Sendable, CaseIterable, Content {
         case abc = "_abc"
         case efg = "-efg"
         case xyz = "(xyz)"
diff --git a/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/PetAPI.swift b/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
index 80026c35fe9e..e93e73fcb531 100644
--- a/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
+++ b/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/APIs/PetAPI.swift
@@ -129,7 +129,7 @@ open class PetAPI {
     /**
      * enum for parameter status
      */
-    public enum Status_findPetsByStatus: String, CaseIterable, Content {
+    public enum Status_findPetsByStatus: String, Sendable, CaseIterable, Content {
         case available = "available"
         case pending = "pending"
         case sold = "sold"