diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6b8430c..6f73614 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,8 +25,8 @@ jobs:
         node: [18, 20]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: ${{ matrix.node }}
       - run: npm ci
@@ -34,7 +34,7 @@ jobs:
       - run: npm test -- --coverage
       - run: node scripts/check-coverage.mjs
       - if: matrix.os == 'ubuntu-22.04' && matrix.node == '20'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: coverage
           path: coverage/
@@ -43,8 +43,8 @@ jobs:
   mcp:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 20
       - name: Install MCP deps
diff --git a/.github/workflows/release-prod.yml b/.github/workflows/release-prod.yml
index 02436cc..4cd7247 100644
--- a/.github/workflows/release-prod.yml
+++ b/.github/workflows/release-prod.yml
@@ -18,11 +18,11 @@ jobs:
   release:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 20
 
@@ -85,7 +85,7 @@ jobs:
 
       - name: Create GitHub release
         if: steps.tag_check.outputs.skip != 'true'
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@3bb12739c298aeb8a4eeaf626c5b8d85266b0e65 # v2
         with:
           tag_name: ${{ steps.version.outputs.tag }}
           name: ${{ steps.version.outputs.tag }}