diff --git a/h2o-assemblies/main/build.gradle b/h2o-assemblies/main/build.gradle
index ec63f9c00e73..10d6648d7d93 100644
--- a/h2o-assemblies/main/build.gradle
+++ b/h2o-assemblies/main/build.gradle
@@ -56,6 +56,9 @@ dependencies {
             because 'Fixes CVE-2020-8908'
             because 'Fixes CVE-2018-10237'
         }
+        api('com.squareup.okio:okio:3.5.0') {
+            because 'Fixes CVE-2023-3635'
+        }
     }
 }
 
diff --git a/h2o-assemblies/steam/build.gradle b/h2o-assemblies/steam/build.gradle
index 210cb0d94e6c..ee5b569437a6 100644
--- a/h2o-assemblies/steam/build.gradle
+++ b/h2o-assemblies/steam/build.gradle
@@ -72,6 +72,9 @@ dependencies {
             because 'Fixes CVE-2020-8908'
             because 'Fixes CVE-2018-10237'
         }
+        api('com.squareup.okio:okio:3.5.0') {
+            because 'Fixes CVE-2023-3635'
+        }
     }
 }