diff --git a/.github/workflows/assemble.yml b/.github/workflows/assemble.yml
index 9dcd525866a9b..c8092d2cf6b0d 100644
--- a/.github/workflows/assemble.yml
+++ b/.github/workflows/assemble.yml
@@ -10,7 +10,7 @@ jobs:
         java: [ 21, 25 ]
         os: [ubuntu-latest, windows-latest, macos-15, ubuntu-24.04-arm]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v5
         with:
diff --git a/.github/workflows/auto-release.yml b/.github/workflows/auto-release.yml
index 95a7c2ae4f64d..2a72f68e9babd 100644
--- a/.github/workflows/auto-release.yml
+++ b/.github/workflows/auto-release.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Get tag
         id: tag
         uses: dawidd6/action-get-tag@v1
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ncipollo/release-action@v1
         with:
           github_token: ${{ steps.github_app_token.outputs.token }}
diff --git a/.github/workflows/benchmark-pull-request.yml b/.github/workflows/benchmark-pull-request.yml
index 1d59ba0149741..7ef07e36e4edc 100644
--- a/.github/workflows/benchmark-pull-request.yml
+++ b/.github/workflows/benchmark-pull-request.yml
@@ -16,7 +16,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up required env vars
         run: |
           echo "PR_NUMBER=${{ github.event.issue.number }}" >> $GITHUB_ENV
@@ -135,7 +135,7 @@ jobs:
           issue-body: "Please approve or deny the benchmark run for PR #${{ env.PR_NUMBER }}"
           exclude-workflow-initiator-as-approver: false
       - name: Checkout PR Repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: ${{ env.prHeadRepo }}
           ref: ${{ env.prHeadRefSha }}
@@ -159,7 +159,7 @@ jobs:
           aws s3 cp distribution/archives/linux-tar/build/distributions/opensearch-min-$OPENSEARCH_VERSION-linux-x64.tar.gz s3://${{ secrets.ARCHIVE_ARTIFACT_BUCKET_NAME }}/PR-$PR_NUMBER/
           echo "DISTRIBUTION_URL=${{ secrets.ARTIFACT_BUCKET_CLOUDFRONT_URL }}/PR-$PR_NUMBER/opensearch-min-$OPENSEARCH_VERSION-linux-x64.tar.gz" >> $GITHUB_ENV
       - name: Checkout opensearch-build repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: opensearch-project/opensearch-build
           ref: main
diff --git a/.github/workflows/changelog_verifier.yml b/.github/workflows/changelog_verifier.yml
index d6d0c7a47f731..fae03cbe34713 100644
--- a/.github/workflows/changelog_verifier.yml
+++ b/.github/workflows/changelog_verifier.yml
@@ -9,7 +9,7 @@ jobs:
     if: github.repository == 'opensearch-project/OpenSearch'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           ref: ${{ github.event.pull_request.head.sha }}
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 4f4e4b3deb056..6b1b13eba87e3 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
diff --git a/.github/workflows/create-documentation-issue.yml b/.github/workflows/create-documentation-issue.yml
index 71e87784c16c6..21f3cfae81f47 100644
--- a/.github/workflows/create-documentation-issue.yml
+++ b/.github/workflows/create-documentation-issue.yml
@@ -21,7 +21,7 @@ jobs:
           installation_id: 22958780
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         
       - name: Edit the issue template
         run: |
diff --git a/.github/workflows/dependabot_pr.yml b/.github/workflows/dependabot_pr.yml
index 3178e2c4bee5c..4939c1e882844 100644
--- a/.github/workflows/dependabot_pr.yml
+++ b/.github/workflows/dependabot_pr.yml
@@ -18,7 +18,7 @@ jobs:
           installation_id: 22958780
 
       - name: Check out code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ steps.github_app_token.outputs.token }}
           ref: ${{ github.head_ref }}
diff --git a/.github/workflows/detect-breaking-change.yml b/.github/workflows/detect-breaking-change.yml
index d9a0aa000f79e..45019ef5e4436 100644
--- a/.github/workflows/detect-breaking-change.yml
+++ b/.github/workflows/detect-breaking-change.yml
@@ -6,7 +6,7 @@ jobs:
   detect-breaking-change:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-java@v5
       with:
         distribution: temurin # Temurin is a distribution of adoptium
diff --git a/.github/workflows/gradle-check.yml b/.github/workflows/gradle-check.yml
index 78c47dc32e697..a2e6973d44407 100644
--- a/.github/workflows/gradle-check.yml
+++ b/.github/workflows/gradle-check.yml
@@ -21,7 +21,7 @@ jobs:
     outputs:
       RUN_GRADLE_CHECK: ${{ steps.changed-files-specific.outputs.any_changed }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Get changed files
       id: changed-files-specific
       uses: tj-actions/changed-files@v47.0.0
@@ -42,7 +42,7 @@ jobs:
     timeout-minutes: 130
     steps:
       - name: Checkout OpenSearch repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 
@@ -93,7 +93,7 @@ jobs:
           echo "post_merge_action=true" >> $GITHUB_ENV
 
       - name: Checkout opensearch-build repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: opensearch-project/opensearch-build
           ref: main
diff --git a/.github/workflows/links.yml b/.github/workflows/links.yml
index 533db328b4d23..bb2f4bb9d8a35 100644
--- a/.github/workflows/links.yml
+++ b/.github/workflows/links.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: lychee Link Checker
         id: lychee
         uses: lycheeverse/lychee-action@v2.6.1
diff --git a/.github/workflows/lucene-snapshots.yml b/.github/workflows/lucene-snapshots.yml
index 1b1c838ce9a90..c09f4c1f470d8 100644
--- a/.github/workflows/lucene-snapshots.yml
+++ b/.github/workflows/lucene-snapshots.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout Lucene ref:${{ github.event.inputs.ref }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: 'apache/lucene'
           ref: ${{ github.event.inputs.ref }}
diff --git a/.github/workflows/precommit.yml b/.github/workflows/precommit.yml
index b6ba15fe1c598..f2e490e233b0c 100644
--- a/.github/workflows/precommit.yml
+++ b/.github/workflows/precommit.yml
@@ -14,7 +14,7 @@ jobs:
             os: 'windows-2025'
             experimental: true
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v5
         with:
diff --git a/.github/workflows/publish-maven-snapshots.yml b/.github/workflows/publish-maven-snapshots.yml
index 6b6158a354cdb..f74b285a15b94 100644
--- a/.github/workflows/publish-maven-snapshots.yml
+++ b/.github/workflows/publish-maven-snapshots.yml
@@ -18,7 +18,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up JDK 21
         uses: actions/setup-java@v5
         with:
diff --git a/.github/workflows/version.yml b/.github/workflows/version.yml
index fe95cc9cb9adb..2417354d0f013 100644
--- a/.github/workflows/version.yml
+++ b/.github/workflows/version.yml
@@ -49,7 +49,7 @@ jobs:
           echo "NEXT_VERSION_UNDERSCORE=$NEXT_VERSION_UNDERSCORE" >> $GITHUB_ENV
           echo "NEXT_VERSION_ID=$NEXT_VERSION_ID" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ env.BASE }}
 
@@ -75,7 +75,7 @@ jobs:
           body: |
             I've noticed that a new tag ${{ env.TAG }} was pushed, and incremented the version from ${{ env.CURRENT_VERSION }} to ${{ env.NEXT_VERSION }}.
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ env.MAIN_BRANCH }}
 
diff --git a/.github/workflows/wrapper.yml b/.github/workflows/wrapper.yml
index e9803c2939e44..21e8821af15df 100644
--- a/.github/workflows/wrapper.yml
+++ b/.github/workflows/wrapper.yml
@@ -7,5 +7,5 @@ jobs:
     if: github.repository == 'opensearch-project/OpenSearch'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: gradle/actions/wrapper-validation@v5
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8afacb5ed267..45850f1f1800c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -141,6 +141,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Bump `actions/upload-artifact` from 4 to 5 ([#20081](https://github.com/opensearch-project/OpenSearch/pull/20081))
 - Bump `com.nimbusds:nimbus-jose-jwt` from 10.5 to 10.6 ([#20084](https://github.com/opensearch-project/OpenSearch/pull/20084))
 - Bump `commons-logging` from 1.2 to 1.3.5 ([#20156](https://github.com/opensearch-project/OpenSearch/pull/20156))
+- Bump `actions/checkout` from 5 to 6 ([#20186](https://github.com/opensearch-project/OpenSearch/pull/20186))
 - Bump `org.apache.commons:commons-configuration2` from 2.12.0 to 2.13.0 ([#20185](https://github.com/opensearch-project/OpenSearch/pull/20185))
 
 ### Deprecated