diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 626f8c73f..7a55952e3 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,5 +1,10 @@
 version: 2
 updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
   - package-ecosystem: "dotnet-sdk"
     directory: "/msbuild"
     schedule:
diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index ee4eceb1f..aa85cabad 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -15,7 +15,7 @@ permissions:
 jobs:
   backport:
     if: ${{ contains(github.event.comment.body, '/backport to') || github.event_name == 'schedule' }}
-    uses: dotnet/arcade/.github/workflows/backport-base.yml@main
+    uses: dotnet/arcade/.github/workflows/backport-base.yml@042024f31f9f89422bc172362a04b5a51ac17df9 # main
     with:
       pr_description_template: |
         Backport of #%source_pr_number% to %target_branch%
diff --git a/.github/workflows/branch-snap.yml b/.github/workflows/branch-snap.yml
index ef117a817..c804e0481 100644
--- a/.github/workflows/branch-snap.yml
+++ b/.github/workflows/branch-snap.yml
@@ -8,7 +8,7 @@ permissions:
 
 jobs:
   check-script:
-    uses: dotnet/arcade/.github/workflows/inter-branch-merge-base.yml@main
+    uses: dotnet/arcade/.github/workflows/inter-branch-merge-base.yml@042024f31f9f89422bc172362a04b5a51ac17df9 # main
     with:
       configuration_file_path: '.config/snap-flow.json'
 
@@ -18,9 +18,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
       - name: Install NodeJS
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: '24.x'
       - name: Install dependencies
@@ -28,7 +28,7 @@ jobs:
       - name: Update version.json
         run: npm run incrementVersion
       - name: Create version update PR
-        uses: peter-evans/create-pull-request@v4
+        uses: peter-evans/create-pull-request@38e0b6e68b4c852a5500a94740f0e535e0d7ba54 # v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: Update main version
@@ -41,12 +41,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out merge branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
         with:
           ref: merge/prerelease-to-release
           fetch-depth: 0
       - name: Install NodeJS
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: '24.x'
       - name: Install dependencies
diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
index 49e1fa4b1..66bf734c1 100644
--- a/.github/workflows/copilot-setup-steps.yml
+++ b/.github/workflows/copilot-setup-steps.yml
@@ -23,16 +23,16 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5
 
       # Install Node.js (required for TypeScript compilation and npm packages)
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: '24'
           cache: 'npm'
 
       # Install .NET SDK (required for some build components and MSBuild tasks)
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4
         with:
           dotnet-version: '10.0.x'
 
diff --git a/.github/workflows/release-comment-handler.yml b/.github/workflows/release-comment-handler.yml
index d1b9473f4..0b1ce458c 100644
--- a/.github/workflows/release-comment-handler.yml
+++ b/.github/workflows/release-comment-handler.yml
@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: Gather participants
         id: participants
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
         with:
           script: |
             console.log("=== WORKFLOW START ===");
@@ -125,7 +125,7 @@ jobs:
           result-encoding: string
 
       - name: Add label comment
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
         with:
           script: |
             console.log("=== STEP 2: ADD COMMENT ===");
diff --git a/.github/workflows/release-reusable.yml b/.github/workflows/release-reusable.yml
index 4a2b0426b..13745f8da 100644
--- a/.github/workflows/release-reusable.yml
+++ b/.github/workflows/release-reusable.yml
@@ -16,12 +16,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout tag
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
         with:
           ref: refs/tags/${{ inputs.tag }}
 
       - name: Create release from CHANGELOG
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
         env:
           TAG: ${{ inputs.tag }}
         with:
diff --git a/.github/workflows/update-changelog.yml b/.github/workflows/update-changelog.yml
index 92e544943..bf5c47870 100644
--- a/.github/workflows/update-changelog.yml
+++ b/.github/workflows/update-changelog.yml
@@ -14,13 +14,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@0717577d45739eb3c851188b29f50ed6c0b2194e # v2
         with:
           fetch-depth: 0
       - name: Install roslyn-tools
         run: dotnet tool install -g Microsoft.RoslynTools --prerelease --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json
       - name: Install NodeJS
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: '24.x'
       - name: Install dependencies
@@ -28,7 +28,7 @@ jobs:
       - name: Update CHANGELOG
         run: npm run updateChangelog
       - name: Create update PR
-        uses: peter-evans/create-pull-request@v4
+        uses: peter-evans/create-pull-request@38e0b6e68b4c852a5500a94740f0e535e0d7ba54 # v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: Update ${{ github.ref_name }} CHANGELOG
diff --git a/azure-pipelines/green-insertion.yml b/azure-pipelines/green-insertion.yml
index 5a139584d..0fe7f879a 100644
--- a/azure-pipelines/green-insertion.yml
+++ b/azure-pipelines/green-insertion.yml
@@ -23,6 +23,7 @@ resources:
   - repository: VSCodeExtensionRepo
     type: git
     name: vs-green
+    ref: a51da83e979246d6c4c52970990ac721fc94d1f7 # refs/heads/main
 
 jobs:
 - job: npmpack