diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 3e04f3724f..a5d21e56c7 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -42,7 +42,7 @@ jobs:
   Build-k-NN-Linux:
     strategy:
       matrix:
-        java: [11, 17, 21]
+        java: [21]
 
     name: Build and Test k-NN Plugin on Linux
     runs-on: ubuntu-latest
@@ -91,7 +91,7 @@ jobs:
   Build-k-NN-MacOS:
     strategy:
       matrix:
-        java: [ 11, 17, 21 ]
+        java: [ 21 ]
 
     name: Build and Test k-NN Plugin on MacOS
     needs: Get-CI-Image-Tag
@@ -131,7 +131,7 @@ jobs:
   Build-k-NN-Windows:
     strategy:
       matrix:
-        java: [ 11, 17, 21 ]
+        java: [ 21 ]
 
     name: Build and Test k-NN Plugin on Windows
     needs: Get-CI-Image-Tag
diff --git a/.github/workflows/backwards_compatibility_tests_workflow.yml b/.github/workflows/backwards_compatibility_tests_workflow.yml
index 5092cd170d..90a20eda89 100644
--- a/.github/workflows/backwards_compatibility_tests_workflow.yml
+++ b/.github/workflows/backwards_compatibility_tests_workflow.yml
@@ -33,7 +33,7 @@ jobs:
   Restart-Upgrade-BWCTests-k-NN:
     strategy:
       matrix:
-        java: [ 11, 17 ]
+        java: [ 21 ]
         os: [ubuntu-latest]
         bwc_version : [ "2.0.1", "2.1.0", "2.2.1", "2.3.0", "2.4.1", "2.5.0", "2.6.0", "2.7.0", "2.8.0", "2.9.0", "2.10.0", "2.11.0", "2.12.0", "2.13.0", "2.14.0", "2.15.0", "2.16.0-SNAPSHOT"]
         opensearch_version : [ "3.0.0-SNAPSHOT" ]
@@ -112,7 +112,7 @@ jobs:
   Rolling-Upgrade-BWCTests-k-NN:
     strategy:
       matrix:
-        java: [ 11, 17 ]
+        java: [ 21 ]
         os: [ubuntu-latest]
         bwc_version: [ "2.16.0-SNAPSHOT" ]
         opensearch_version: [ "3.0.0-SNAPSHOT" ]
diff --git a/.github/workflows/maven-publish.yml b/.github/workflows/maven-publish.yml
index 724e3a2139..644342c78b 100644
--- a/.github/workflows/maven-publish.yml
+++ b/.github/workflows/maven-publish.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: temurin # Temurin is a distribution of adoptium
-          java-version: 11
+          java-version: 21
       - uses: actions/checkout@v3
       - uses: aws-actions/configure-aws-credentials@v1
         with: