diff --git a/modules/lsp/src/test/resources/test-workspaces/default/smithy-build.json b/modules/lsp/src/test/resources/test-workspaces/default/smithy-build.json
index 01d376b6..20069145 100644
--- a/modules/lsp/src/test/resources/test-workspaces/default/smithy-build.json
+++ b/modules/lsp/src/test/resources/test-workspaces/default/smithy-build.json
@@ -2,6 +2,6 @@
   "imports": ["./weather.smithy", "./no-runner.smithy"],
   "mavenDependencies": [
     "com.disneystreaming.alloy:alloy-core:0.3.8",
-    "com.disneystreaming.smithy4s:smithy4s-protocol:0.18.16"
+    "com.disneystreaming.smithy4s:smithy4s-protocol:0.18.19"
   ]
 }
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 96b2c0a2..adc144f5 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -9,7 +9,7 @@ libraryDependencies ++= Seq(
 )
 
 // try to keep in sync with smithy-build.json
-addSbtPlugin("com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "0.18.15")
+addSbtPlugin("com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "0.18.19")
 
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.1")
diff --git a/smithy-build.json b/smithy-build.json
index 34ccf910..8ebc4e54 100644
--- a/smithy-build.json
+++ b/smithy-build.json
@@ -2,7 +2,7 @@
   "imports": ["modules/core/src/test/smithy"],
   "mavenDependencies": [
     "com.disneystreaming.alloy:alloy-core:0.3.8",
-    "com.disneystreaming.smithy4s:smithy4s-protocol:0.18.16",
+    "com.disneystreaming.smithy4s:smithy4s-protocol:0.18.19",
     "software.amazon.smithy:smithy-aws-traits:1.49.0"
   ]
 }