diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index ae8a4bc0ea..8b3ce1689c 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -20,7 +20,7 @@ jobs:
     outputs:
       RUN_BUILD_AND_TEST: ${{ steps.check.outputs.files_changed }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Check files
         id: check
         uses: ./.github/actions/check-files
@@ -30,7 +30,7 @@ jobs:
   Get-CI-Image-Tag:
     needs: check-files
     if: needs.check-files.outputs.RUN_BUILD_AND_TEST == 'true'
-    uses: opensearch-project/opensearch-build/.github/workflows/get-ci-image-tag.yml@main
+    uses: opensearch-project/opensearch-build/.github/workflows/get-ci-image-tag.yml@c2498b758c08fb7bc48476509a5fc1b8dd5f7493 # main
     with:
       product: opensearch
 
@@ -59,7 +59,7 @@ jobs:
         run: ${{ needs.Get-CI-Image-Tag.outputs.ci-image-start-command }}
 
       - name: Checkout k-NN
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
@@ -68,7 +68,7 @@ jobs:
           su `id -un 1000` -c 'git config --global user.email "github-actions[bot]@users.noreply.github.com"'
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'
@@ -98,7 +98,7 @@ jobs:
 
 
       - name: Upload Coverage Report
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@75cd11691c0faa626561e295848008c8a7dddffe # v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           use_pypi: true
@@ -114,7 +114,7 @@ jobs:
 
     steps:
       - name: Checkout k-NN
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
@@ -123,7 +123,7 @@ jobs:
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'
@@ -157,7 +157,7 @@ jobs:
 
     steps:
       - name: Checkout k-NN
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
@@ -166,7 +166,7 @@ jobs:
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'
diff --git a/.github/workflows/auto-release.yml b/.github/workflows/auto-release.yml
index c67e12badb..8505a552aa 100644
--- a/.github/workflows/auto-release.yml
+++ b/.github/workflows/auto-release.yml
@@ -13,16 +13,16 @@ jobs:
     steps:
       - name: GitHub App token
         id: github_app_token
-        uses: tibdex/github-app-token@v1.5.0
+        uses: tibdex/github-app-token@1901dc7d52169e70c27a8da37aef0d423e2867a2 # v1.5.0
         with:
           app_id: ${{ secrets.APP_ID }}
           private_key: ${{ secrets.APP_PRIVATE_KEY }}
           installation_id: 22958780
       - name: Get tag
         id: tag
-        uses: dawidd6/action-get-tag@v1
-      - uses: actions/checkout@v2
-      - uses: ncipollo/release-action@v1
+        uses: dawidd6/action-get-tag@727a6f0a561be04e09013531e73a3983a65e3479 # v1
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
+      - uses: ncipollo/release-action@339a81892b84b4eeb0f6e744e4574d79d0d9b8dd # v1
         with:
           github_token: ${{ steps.github_app_token.outputs.token }}
           bodyFile: release-notes/opensearch-knn.release-notes-${{steps.tag.outputs.tag}}.md
diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index e47d8d88c0..2609a3c460 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -15,14 +15,14 @@ jobs:
     steps:
       - name: GitHub App token
         id: github_app_token
-        uses: tibdex/github-app-token@v1.5.0
+        uses: tibdex/github-app-token@1901dc7d52169e70c27a8da37aef0d423e2867a2 # v1.5.0
         with:
           app_id: ${{ secrets.APP_ID }}
           private_key: ${{ secrets.APP_PRIVATE_KEY }}
           installation_id: 22958780
 
       - name: Backport
-        uses: VachaShah/backport@v1.1.4
+        uses: VachaShah/backport@28c49d91ceec57d7c9f625f1031c1a4d637251f5 # v1.1.4
         with:
           github_token: ${{ steps.github_app_token.outputs.token }}
           branch_name: backport/backport-${{ github.event.number }}
diff --git a/.github/workflows/backwards_compatibility_tests_workflow.yml b/.github/workflows/backwards_compatibility_tests_workflow.yml
index 5429ddbb42..0db4b36f88 100644
--- a/.github/workflows/backwards_compatibility_tests_workflow.yml
+++ b/.github/workflows/backwards_compatibility_tests_workflow.yml
@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: Checkout k-NN
-        uses: actions/checkout@v1
+        uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e # v1
 
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
@@ -63,7 +63,7 @@ jobs:
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@b6e674f4b717d7b0ae3baee0fbe79f498905dfde # v1
         with:
           java-version: ${{ matrix.java }}
 
@@ -140,7 +140,7 @@ jobs:
 
     steps:
       - name: Checkout k-NN
-        uses: actions/checkout@v1
+        uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e # v1
 
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
@@ -149,7 +149,7 @@ jobs:
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@b6e674f4b717d7b0ae3baee0fbe79f498905dfde # v1
         with:
           java-version: ${{ matrix.java }}
 
diff --git a/.github/workflows/changelog_verifier.yml b/.github/workflows/changelog_verifier.yml
index 791c02ab70..3c2a2060cc 100644
--- a/.github/workflows/changelog_verifier.yml
+++ b/.github/workflows/changelog_verifier.yml
@@ -8,11 +8,11 @@ jobs:
   verify-changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           ref: ${{ github.event.pull_request.head.sha }}
 
-      - uses: dangoslen/changelog-enforcer@v3
+      - uses: dangoslen/changelog-enforcer@204e7d3ef26579f4cd0fd759c57032656fdf23c7 # v3
         with:
           skipLabels: "autocut, skip-changelog"
diff --git a/.github/workflows/create-documentation-issue.yml b/.github/workflows/create-documentation-issue.yml
index 1ab6e8b15c..af2b9f2cad 100644
--- a/.github/workflows/create-documentation-issue.yml
+++ b/.github/workflows/create-documentation-issue.yml
@@ -14,14 +14,14 @@ jobs:
     steps:
       - name: GitHub App token
         id: github_app_token
-        uses: tibdex/github-app-token@v1.5.0
+        uses: tibdex/github-app-token@1901dc7d52169e70c27a8da37aef0d423e2867a2 # v1.5.0
         with:
           app_id: ${{ secrets.APP_ID }}
           private_key: ${{ secrets.APP_PRIVATE_KEY }}
           installation_id: 22958780
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
         
       - name: Edit the issue template
         run: |
@@ -29,7 +29,7 @@ jobs:
           
       - name: Create Issue From File
         id: create-issue
-        uses: peter-evans/create-issue-from-file@v4
+        uses: peter-evans/create-issue-from-file@433e51abf769039ee20ba1293a088ca19d573b7f # v4
         with:
           title: Add documentation related to new feature
           content-filepath: ./.github/ISSUE_TEMPLATE/documentation-issue.md
diff --git a/.github/workflows/delete_backport_branch.yml b/.github/workflows/delete_backport_branch.yml
index a4d186ca79..0ff2f7b704 100644
--- a/.github/workflows/delete_backport_branch.yml
+++ b/.github/workflows/delete_backport_branch.yml
@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'opensearch-project/k-NN' && startsWith(github.event.pull_request.head.ref,'backport/')
     steps:
     - name: Delete merged branch
-      uses: actions/github-script@v7
+      uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
       with:
         script: |
           github.rest.git.deleteRef({
diff --git a/.github/workflows/draft-release-notes-workflow.yml b/.github/workflows/draft-release-notes-workflow.yml
index 6b3d89c33c..48e2bf97aa 100644
--- a/.github/workflows/draft-release-notes-workflow.yml
+++ b/.github/workflows/draft-release-notes-workflow.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Update draft release notes
-        uses: release-drafter/release-drafter@v5
+        uses: release-drafter/release-drafter@09c613e259eb8d4e7c81c2cb00618eb5fc4575a7 # v5
         with:
           config-name: draft-release-notes-config.yml
           name: Version (set here)
diff --git a/.github/workflows/issue-dedupe.yml b/.github/workflows/issue-dedupe.yml
index 6a7c78627f..10cd4ab5ac 100644
--- a/.github/workflows/issue-dedupe.yml
+++ b/.github/workflows/issue-dedupe.yml
@@ -20,7 +20,7 @@ jobs:
       (github.event_name == 'issues' &&
        github.event.issue.user.type != 'Bot' &&
        github.repository == 'opensearch-project/k-NN')
-    uses: opensearch-project/opensearch-build/.github/workflows/issue-dedupe-detect.yml@main
+    uses: opensearch-project/opensearch-build/.github/workflows/issue-dedupe-detect.yml@c2498b758c08fb7bc48476509a5fc1b8dd5f7493 # main
     permissions:
       contents: read
       issues: write
@@ -33,7 +33,7 @@ jobs:
 
   auto-close-issue:
     if: github.event_name == 'schedule' && github.repository == 'opensearch-project/k-NN'
-    uses: opensearch-project/opensearch-build/.github/workflows/issue-dedupe-autoclose.yml@main
+    uses: opensearch-project/opensearch-build/.github/workflows/issue-dedupe-autoclose.yml@c2498b758c08fb7bc48476509a5fc1b8dd5f7493 # main
     permissions:
       issues: write
     with:
diff --git a/.github/workflows/links.yml b/.github/workflows/links.yml
index 3d0b81ad5f..88f0d32121 100644
--- a/.github/workflows/links.yml
+++ b/.github/workflows/links.yml
@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
       - name: lychee Link Checker
         id: lychee
-        uses: lycheeverse/lychee-action@master
+        uses: lycheeverse/lychee-action@6da1d14f3a43098a294b7696d93d938aa8d20fc0 # master
         with:
           args: --accept=200,403,429  **/*.html **/*.md **/*.txt **/*.json
         env:
diff --git a/.github/workflows/maven-publish.yml b/.github/workflows/maven-publish.yml
index 7c33a35fad..c7c792e34c 100644
--- a/.github/workflows/maven-publish.yml
+++ b/.github/workflows/maven-publish.yml
@@ -17,14 +17,14 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/setup-java@v3
+      - uses: actions/setup-java@17f84c3641ba7b8f6deff6309fc4c864478f5d62 # v3
         with:
           distribution: temurin # Temurin is a distribution of adoptium
           java-version: 21
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
 
       - name: Load secret
-        uses: 1password/load-secrets-action@v2
+        uses: 1password/load-secrets-action@581a835fb51b8e7ec56b71cf2ffddd7e68bb25e0 # v2
         with:
           # Export loaded secrets as environment variables
           export-env: true
@@ -34,7 +34,7 @@ jobs:
           MAVEN_SNAPSHOTS_S3_ROLE: op://opensearch-infra-secrets/maven-snapshots-s3/role
 
       - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v5
+        uses: aws-actions/configure-aws-credentials@61815dcd50bd041e203e49132bacad1fd04d2708 # v5
         with:
           role-to-assume: ${{ env.MAVEN_SNAPSHOTS_S3_ROLE }}
           aws-region: us-east-1
diff --git a/.github/workflows/pr_review.yml b/.github/workflows/pr_review.yml
index 7939008645..ba73e64567 100644
--- a/.github/workflows/pr_review.yml
+++ b/.github/workflows/pr_review.yml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   Code-Diff-Analyzer:
-    uses: opensearch-project/opensearch-build/.github/workflows/code-diff-analyzer.yml@main
+    uses: opensearch-project/opensearch-build/.github/workflows/code-diff-analyzer.yml@c2498b758c08fb7bc48476509a5fc1b8dd5f7493 # main
     if: github.repository == 'opensearch-project/k-NN'
     permissions:
       id-token: write  # github oidc to assume aws roles
@@ -18,7 +18,7 @@ jobs:
       update_pr_comment_with_analyzer_report: true
 
   Code-Diff-Reviewer:
-    uses: opensearch-project/opensearch-build/.github/workflows/code-diff-reviewer.yml@main
+    uses: opensearch-project/opensearch-build/.github/workflows/code-diff-reviewer.yml@c2498b758c08fb7bc48476509a5fc1b8dd5f7493 # main
     needs: Code-Diff-Analyzer
     if: github.repository == 'opensearch-project/k-NN'
     permissions:
diff --git a/.github/workflows/remote_index_build.yml b/.github/workflows/remote_index_build.yml
index a9c5999edf..897cd2f7d7 100644
--- a/.github/workflows/remote_index_build.yml
+++ b/.github/workflows/remote_index_build.yml
@@ -18,7 +18,7 @@ jobs:
     outputs:
       RUN_IT_TEST: ${{ steps.check.outputs.files_changed }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Check files
         id: check
         uses: ./.github/actions/check-files
@@ -45,7 +45,7 @@ jobs:
 
     steps:
       - name: Checkout k-NN
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
@@ -54,7 +54,7 @@ jobs:
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'
diff --git a/.github/workflows/test_security.yml b/.github/workflows/test_security.yml
index 65953e8e22..51d0bd5b95 100644
--- a/.github/workflows/test_security.yml
+++ b/.github/workflows/test_security.yml
@@ -18,7 +18,7 @@ jobs:
     outputs:
       RUN_SECURE_IT_TEST: ${{ steps.check.outputs.files_changed }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Check files
         id: check
         uses: ./.github/actions/check-files
@@ -28,7 +28,7 @@ jobs:
   Get-CI-Image-Tag:
     needs: check-files
     if: needs.check-files.outputs.RUN_SECURE_IT_TEST == 'true'
-    uses: opensearch-project/opensearch-build/.github/workflows/get-ci-image-tag.yml@main
+    uses: opensearch-project/opensearch-build/.github/workflows/get-ci-image-tag.yml@c2498b758c08fb7bc48476509a5fc1b8dd5f7493 # main
     with:
       product: opensearch
 
@@ -55,7 +55,7 @@ jobs:
       - name: Run start commands
         run: ${{ needs.Get-CI-Image-Tag.outputs.ci-image-start-command }}
       - name: Checkout k-NN
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       # Setup git user so that patches for native libraries can be applied and committed
       - name: Setup git user
         run: |
@@ -63,7 +63,7 @@ jobs:
           su `id -un 1000` -c 'git config --global user.email "github-actions[bot]@users.noreply.github.com"'
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4
         with:
           java-version: ${{ matrix.java }}
           distribution: 'temurin'