diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92a51144..060a9eac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,10 @@ Amazon Kinesis Client Library (KCL) 1.x will reach end-of-support on January 30,
 * [Kinesis documentation: KCL version lifecycle policy](https://docs.aws.amazon.com/streams/latest/dev/kcl-version-lifecycle-policy.html)
 * [Kinesis documentation: Migrating from KCL 1.x to KCL 3.x](https://docs.aws.amazon.com/streams/latest/dev/kcl-migration-1-3.html)
 
-### Latest Release (1.15.2 - Aug 14, 2024)
+### Latest Release (1.15.3 - May 27, 2025)
+* [#1475](https://github.com/awslabs/amazon-kinesis-client/pull/1475) Upgraded protobuf dependency from 4.27.1 to 4.31.0
+
+### Release (1.15.2 - Aug 14, 2024)
 * [#1371](https://github.com/awslabs/amazon-kinesis-client/pull/1371) Fix a bug in debug and trace logging levels for worker
 * [#1224](https://github.com/awslabs/amazon-kinesis-client/pull/1224) Modify RecordProcessorCheckpointer#advancePosition Metrics usage to ensure proper closure
 * [#1345](https://github.com/awslabs/amazon-kinesis-client/pull/1345) Generate wrappers from proto files instead of shipping them directly
diff --git a/README.md b/README.md
index 1eca4d8a..4a63ab52 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,10 @@ To make it easier for developers to write record processors in other languages,
 
 ## Release Notes
 
-### Latest Release (1.15.2 - Aug 14, 2024)
+### Latest Release (1.15.3 - May 27, 2025)
+* [#1475](https://github.com/awslabs/amazon-kinesis-client/pull/1475) Upgraded protobuf dependency from 4.27.1 to 4.31.0
+
+### Release (1.15.2 - Aug 14, 2024)
 * [#1371](https://github.com/awslabs/amazon-kinesis-client/pull/1371) Fix a bug in debug and trace logging levels for worker
 * [#1224](https://github.com/awslabs/amazon-kinesis-client/pull/1224) Modify RecordProcessorCheckpointer#advancePosition Metrics usage to ensure proper closure
 * [#1345](https://github.com/awslabs/amazon-kinesis-client/pull/1345) Generate wrappers from proto files instead of shipping them directly
diff --git a/pom.xml b/pom.xml
index bcfc7b3d..86cc0a8f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
   <artifactId>amazon-kinesis-client</artifactId>
   <packaging>jar</packaging>
   <name>Amazon Kinesis Client Library for Java</name>
-  <version>1.15.3-SNAPSHOT</version>
+  <version>1.15.3</version>
   <description>The Amazon Kinesis Client Library for Java enables Java developers to easily consume and process data
     from Amazon Kinesis.
   </description>
diff --git a/src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/KinesisClientLibConfiguration.java b/src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/KinesisClientLibConfiguration.java
index f96974b8..baa17448 100644
--- a/src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/KinesisClientLibConfiguration.java
+++ b/src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/KinesisClientLibConfiguration.java
@@ -149,7 +149,7 @@ public class KinesisClientLibConfiguration {
     /**
      * User agent set when Amazon Kinesis Client Library makes AWS requests.
      */
-    public static final String KINESIS_CLIENT_LIB_USER_AGENT = "amazon-kinesis-client-library-java-1.15.2";
+    public static final String KINESIS_CLIENT_LIB_USER_AGENT = "amazon-kinesis-client-library-java-1.15.3";
 
     /**
      * KCL will validate client provided sequence numbers with a call to Amazon Kinesis before checkpointing for calls