diff --git a/.changes/68339620-44f2-4016-8595-5dbcb3ccfe1e.json b/.changes/68339620-44f2-4016-8595-5dbcb3ccfe1e.json
new file mode 100644
index 00000000000..38e0a29fa45
--- /dev/null
+++ b/.changes/68339620-44f2-4016-8595-5dbcb3ccfe1e.json
@@ -0,0 +1,5 @@
+{
+    "id": "68339620-44f2-4016-8595-5dbcb3ccfe1e",
+    "type": "misc",
+    "description": "Bump to smithy-kotlin 1.3.18"
+}
\ No newline at end of file
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 88d44c67b11..39d46503428 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -11,8 +11,8 @@ coroutines-version = "1.9.0"
 atomicfu-version = "0.25.0"
 
 # smithy-kotlin codegen and runtime are versioned separately
-smithy-kotlin-runtime-version = "1.3.17"
-smithy-kotlin-codegen-version = "0.33.17"
+smithy-kotlin-runtime-version = "1.3.18"
+smithy-kotlin-codegen-version = "0.33.18"
 
 # codegen
 smithy-version = "1.51.0"