diff --git a/codegen/CHANGELOG.md b/codegen/CHANGELOG.md
index 52d245b85d4c..69b3fd0cf457 100644
--- a/codegen/CHANGELOG.md
+++ b/codegen/CHANGELOG.md
@@ -1,15 +1,28 @@
 # Smithy AWS Typescript Codegen Changelog
 
+## 0.40.0 (2025-12-22)
+
+### Features
+
+- Upgraded to smithy-typescript 0.40.0 ([Release Notes](https://github.com/smithy-lang/smithy-typescript/blob/main/CHANGELOG.md#0400-2025-12-22))
+- Upgraded smithy version to 1.65.0 ([#7588](https://github.com/aws/aws-sdk-js-v3/pull/7588))
+
 ## 0.39.1 (2025-12-10)
 
+### Features
+
 - Upgraded to smithy-typescript 0.39.1 ([Release Notes](https://github.com/smithy-lang/smithy-typescript/blob/main/CHANGELOG.md#0391-2025-12-10))
 
 ## 0.39.0 (2025-12-05)
 
+### Features
+
 - Upgraded to smithy-typescript 0.39.0 ([Release Notes](https://github.com/smithy-lang/smithy-typescript/blob/main/CHANGELOG.md#0390-2025-12-05))
 
 ## 0.38.0 (2025-11-20)
 
+### Features
+
 - Upgraded to smithy-typescript 0.38.0 ([Release Notes](https://github.com/smithy-lang/smithy-typescript/blob/main/CHANGELOG.md#0380-2025-11-20))
 - Includes upgrade of smithy to 1.64.0
 
diff --git a/codegen/build.gradle.kts b/codegen/build.gradle.kts
index a05a5e26a1b1..ab30eb147283 100644
--- a/codegen/build.gradle.kts
+++ b/codegen/build.gradle.kts
@@ -37,7 +37,7 @@ allprojects {
         mavenCentral()
     }
     group = "software.amazon.smithy.typescript"
-    version = "0.39.1"
+    version = "0.40.0"
 }
 
 // The root project doesn't produce a JAR.
diff --git a/codegen/smithy-aws-typescript-codegen/build.gradle.kts b/codegen/smithy-aws-typescript-codegen/build.gradle.kts
index d64ccedd6f36..5cc4ad7f13f9 100644
--- a/codegen/smithy-aws-typescript-codegen/build.gradle.kts
+++ b/codegen/smithy-aws-typescript-codegen/build.gradle.kts
@@ -31,7 +31,7 @@ buildscript {
 
 dependencies {
     // Smithy TypeScript
-    api("software.amazon.smithy.typescript:smithy-typescript-codegen:0.39.1")
+    api("software.amazon.smithy.typescript:smithy-typescript-codegen:0.40.0")
 
     // Smithy generic dependencies
     api("software.amazon.smithy:smithy-model:$smithyVersion")
diff --git a/scripts/generate-clients/config.js b/scripts/generate-clients/config.js
index 5282bc8d74df..a4a63decf63e 100644
--- a/scripts/generate-clients/config.js
+++ b/scripts/generate-clients/config.js
@@ -2,8 +2,8 @@
 module.exports = {
   // Use full commit hash as we explicitly fetch it.
   // Comparison link (update with previous hash):
-  // https://github.com/smithy-lang/smithy-typescript/compare/521d67c38f8928c514d1fcea3fc08e40c2300513...ce2697be6df3479d5dd239abb1a19a38093aaeeb
-  SMITHY_TS_COMMIT: "ce2697be6df3479d5dd239abb1a19a38093aaeeb",
+  // https://github.com/smithy-lang/smithy-typescript/compare/ce2697be6df3479d5dd239abb1a19a38093aaeeb...cb65d39b6c223608ad7752b0ffe7dc9cf997a8e6
+  SMITHY_TS_COMMIT: "cb65d39b6c223608ad7752b0ffe7dc9cf997a8e6",
 };
 
 if (module.exports.SMITHY_TS_COMMIT.length < 40) {