diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51ff76a7dba4a..ed4f49625ca32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -47,6 +47,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Bump `jakarta.enterprise:jakarta.enterprise.cdi-api` from 4.0.1 to 4.1.0 ([#13328](https://github.com/opensearch-project/OpenSearch/pull/13328))
 - Bump `com.google.api.grpc:proto-google-iam-v1` from 0.12.0 to 1.33.0 ([#13332](https://github.com/opensearch-project/OpenSearch/pull/13332))
 - Bump `com.squareup.okio:okio` from 3.8.0 to 3.9.0 ([#12997](https://github.com/opensearch-project/OpenSearch/pull/12997))
+- OpenJDK Update (April 2024 Patch releases), update to Eclipse Temurin 21.0.3+9 ([#13389](https://github.com/opensearch-project/OpenSearch/pull/13389))
 
 ### Changed
 - [BWC and API enforcement] Enforcing the presence of API annotations at build time ([#12872](https://github.com/opensearch-project/OpenSearch/pull/12872))
diff --git a/buildSrc/src/main/java/org/opensearch/gradle/test/DistroTestPlugin.java b/buildSrc/src/main/java/org/opensearch/gradle/test/DistroTestPlugin.java
index bc44f81a81aff..b2b3e3003e572 100644
--- a/buildSrc/src/main/java/org/opensearch/gradle/test/DistroTestPlugin.java
+++ b/buildSrc/src/main/java/org/opensearch/gradle/test/DistroTestPlugin.java
@@ -77,9 +77,9 @@
 import java.util.stream.Stream;
 
 public class DistroTestPlugin implements Plugin<Project> {
-    private static final String SYSTEM_JDK_VERSION = "21.0.2+13";
+    private static final String SYSTEM_JDK_VERSION = "21.0.3+9";
     private static final String SYSTEM_JDK_VENDOR = "adoptium";
-    private static final String GRADLE_JDK_VERSION = "21.0.2+13";
+    private static final String GRADLE_JDK_VERSION = "21.0.3+9";
     private static final String GRADLE_JDK_VENDOR = "adoptium";
 
     // all distributions used by distro tests. this is temporary until tests are per distribution
diff --git a/buildSrc/version.properties b/buildSrc/version.properties
index af993530b58d1..92c248768b1e2 100644
--- a/buildSrc/version.properties
+++ b/buildSrc/version.properties
@@ -2,7 +2,7 @@ opensearch        = 2.14.0
 lucene            = 9.10.0
 
 bundled_jdk_vendor = adoptium
-bundled_jdk = 21.0.2+13
+bundled_jdk = 21.0.3+9
 
 # optional dependencies
 spatial4j         = 0.7