diff --git a/codegen/CHANGELOG.md b/codegen/CHANGELOG.md
index ea353356c6a9..26fa153d6e72 100644
--- a/codegen/CHANGELOG.md
+++ b/codegen/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Smithy AWS Typescript Codegen Changelog
 
+## 0.20.0 (2024-03-27)
+
+### Features
+* Reduced code size for xml serde ([#5568](https://github.com/aws/aws-sdk-js-v3/pull/5568), [#5566](https://github.com/aws/aws-sdk-js-v3/pull/5566))
+* Reduced generated code size for all clients with library serde helpers ([#5855](https://github.com/aws/aws-sdk-js-v3/pull/5855)) 
+* Implemented lazy-loading of STS & SSO clients in credential providers ([#5681](https://github.com/aws/aws-sdk-js-v3/pull/5681))
+
+### Bug Fixes
+* Fixed an issue that could cause endpoint augmentations not to be applied in certain cases ([#5933](https://github.com/aws/aws-sdk-js-v3/pull/5933))
+* Fixed an issue where the `_json` deser function wouldn't be imported ([#5837](https://github.com/aws/aws-sdk-js-v3/pull/5837))
+* Added string fallback for S3 responses that contain the `Expires` timestamp instead of throwing an exception ([#5715](https://github.com/aws/aws-sdk-js-v3/pull/5715))
+
 ## 0.19.0 (2023-11-03)
 
 ### Features 
diff --git a/codegen/build.gradle.kts b/codegen/build.gradle.kts
index 42cf1ec60c64..1850284d660c 100644
--- a/codegen/build.gradle.kts
+++ b/codegen/build.gradle.kts
@@ -31,7 +31,7 @@ allprojects {
         mavenCentral()
     }
     group = "software.amazon.smithy.typescript"
-    version = "0.19.0"
+    version = "0.20.0"
 }
 
 // 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 21a43823519a..d647b432a102 100644
--- a/codegen/smithy-aws-typescript-codegen/build.gradle.kts
+++ b/codegen/smithy-aws-typescript-codegen/build.gradle.kts
@@ -43,7 +43,7 @@ dependencies {
     api("software.amazon.smithy:smithy-protocol-test-traits:$smithyVersion")
     api("software.amazon.smithy:smithy-model:$smithyVersion")
     api("software.amazon.smithy:smithy-rules-engine:$smithyVersion")
-    api("software.amazon.smithy.typescript:smithy-typescript-codegen:0.19.0")
+    api("software.amazon.smithy.typescript:smithy-typescript-codegen:0.20.0")
 }
 
 tasks.register("set-aws-sdk-versions") {
diff --git a/scripts/generate-clients/config.js b/scripts/generate-clients/config.js
index e412ef63a3bc..434e4f99fa84 100644
--- a/scripts/generate-clients/config.js
+++ b/scripts/generate-clients/config.js
@@ -1,7 +1,7 @@
 // Update this commit when taking up new changes from smithy-typescript.
 module.exports = {
   // Use full commit hash as we explicitly fetch it.
-  SMITHY_TS_COMMIT: "47555d30d155f4b6d6966c2dfe28740d18e5b5a1",
+  SMITHY_TS_COMMIT: "66f2b660e6b1dfc40699772a51778086495fd2cf",
 };
 
 if (module.exports.SMITHY_TS_COMMIT.length < 40) {