diff --git a/build.sbt b/build.sbt
index 9d362cf7..af562334 100644
--- a/build.sbt
+++ b/build.sbt
@@ -131,7 +131,7 @@ lazy val core = module("core")
       "com.disneystreaming.smithy4s" %% "smithy4s-aws-http4s" % smithy4sVersion.value,
       "com.disneystreaming.smithy4s" % "smithy4s-protocol" % smithy4sVersion.value % Test,
       "com.disneystreaming.alloy" % "alloy-core" % "0.2.7" % Test,
-      "software.amazon.smithy" % "smithy-aws-traits" % "1.34.0" % Test,
+      "software.amazon.smithy" % "smithy-aws-traits" % "1.38.0" % Test,
     ),
     Smithy4sCodegenPlugin.defaultSettings(Test),
   )
diff --git a/smithy-build.json b/smithy-build.json
index 1bdb8712..f3632d89 100644
--- a/smithy-build.json
+++ b/smithy-build.json
@@ -3,6 +3,6 @@
   "mavenDependencies": [
     "com.disneystreaming.alloy:alloy-core:0.2.7",
     "com.disneystreaming.smithy4s:smithy4s-protocol:0.17.6",
-    "software.amazon.smithy:smithy-aws-traits:1.34.0"
+    "software.amazon.smithy:smithy-aws-traits:1.38.0"
   ]
 }