diff --git a/.github/workflows/plugin_install.yml b/.github/workflows/plugin_install.yml
index 44c06b962e..6d3731b3fc 100644
--- a/.github/workflows/plugin_install.yml
+++ b/.github/workflows/plugin_install.yml
@@ -3,7 +3,7 @@ name: Plugin Install
 on: [push, pull_request, workflow_dispatch]
 
 env:
-  OPENSEARCH_VERSION: 1.3.20
+  OPENSEARCH_VERSION: 1.3.21
   PLUGIN_NAME: opensearch-security
 
 jobs:
diff --git a/build.gradle b/build.gradle
index a800f5d5f3..3911f7cce1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -58,7 +58,7 @@ repositories {
 
 ext {
     isSnapshot = "true" == System.getProperty("build.snapshot", "true")
-    opensearch_version = System.getProperty("opensearch.version", "1.3.20-SNAPSHOT")
+    opensearch_version = System.getProperty("opensearch.version", "1.3.21-SNAPSHOT")
     buildVersionQualifier = System.getProperty("build.version_qualifier", "")
     version_tokens = opensearch_version.tokenize('-')
     opensearch_build = version_tokens[0] + '.0'