diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index 92c74fceba..3ba027ce0f 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -26,13 +26,13 @@ jobs:
       actions: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           fetch-depth: 1
 
       - name: Run Claude Code
         id: claude
-        uses: anthropics/claude-code-action@v1
+        uses: anthropics/claude-code-action@51705da45eecce209d4700538bf8377d5b5fc695 # v1
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
 
diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index df84276249..3e2efb6fb8 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -14,7 +14,7 @@ jobs:
     outputs:
       packages: ${{ steps.find-packages.outputs.packages }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
       - name: Find Python packages
         id: find-packages
@@ -31,13 +31,13 @@ jobs:
     name: Test ${{ matrix.package }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39 # v3
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version-file: "src/${{ matrix.package }}/.python-version"
 
@@ -68,13 +68,13 @@ jobs:
     name: Build ${{ matrix.package }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39 # v3
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version-file: "src/${{ matrix.package }}/.python-version"
 
@@ -91,7 +91,7 @@ jobs:
         run: uv build
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: dist-${{ matrix.package }}
           path: src/${{ matrix.package }}/dist/
@@ -112,10 +112,10 @@ jobs:
 
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
         with:
           name: dist-${{ matrix.package }}
           path: dist/
 
       - name: Publish package to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
diff --git a/.github/workflows/readme-pr-check.yml b/.github/workflows/readme-pr-check.yml
index 66cb3a31e6..1cabb1eee2 100644
--- a/.github/workflows/readme-pr-check.yml
+++ b/.github/workflows/readme-pr-check.yml
@@ -17,7 +17,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Check files and comment if README-only
-        uses: actions/github-script@v8
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const { owner, repo } = context.repo;
@@ -63,7 +63,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Swap labels and minimize comments
-        uses: actions/github-script@v8
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         with:
           script: |
             const { owner, repo } = context.repo;
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a3ad5387d3..edeba25d77 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -15,7 +15,7 @@ jobs:
       npm_packages: ${{ steps.create-npm-packages.outputs.npm_packages}}
       pypi_packages: ${{ steps.create-pypi-packages.outputs.pypi_packages}}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           fetch-depth: 0
 
@@ -27,7 +27,7 @@ jobs:
           echo "Using last release hash: ${HASH}"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5
 
       - name: Create version name
         id: create-version
@@ -43,7 +43,7 @@ jobs:
           cat RELEASE_NOTES.md
 
       - name: Release notes
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: release-notes
           path: RELEASE_NOTES.md
@@ -74,12 +74,12 @@ jobs:
     outputs:
       changes_made: ${{ steps.commit.outputs.changes_made }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           fetch-depth: 0
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5
 
       - name: Update packages
         run: |
@@ -118,15 +118,15 @@ jobs:
       id-token: write # Required for trusted publishing
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           ref: ${{ needs.create-metadata.outputs.version }}
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version-file: "src/${{ matrix.package }}/.python-version"
 
@@ -143,7 +143,7 @@ jobs:
         run: uv build
 
       - name: Publish package to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
         with:
           packages-dir: src/${{ matrix.package }}/dist
 
@@ -158,11 +158,11 @@ jobs:
     environment: release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
         with:
           ref: ${{ needs.create-metadata.outputs.version }}
 
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: 22
           cache: npm
@@ -204,10 +204,10 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
       - name: Download release notes
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
         with:
           name: release-notes
 
diff --git a/.github/workflows/typescript.yml b/.github/workflows/typescript.yml
index 4e29e524ad..33fc6d5499 100644
--- a/.github/workflows/typescript.yml
+++ b/.github/workflows/typescript.yml
@@ -14,7 +14,7 @@ jobs:
     outputs:
       packages: ${{ steps.find-packages.outputs.packages }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       - name: Find JS packages
         id: find-packages
         working-directory: src
@@ -30,9 +30,9 @@ jobs:
     name: Test ${{ matrix.package }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: 22
           cache: npm
@@ -53,9 +53,9 @@ jobs:
     name: Build ${{ matrix.package }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
 
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: 22
           cache: npm
@@ -84,8 +84,8 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
         with:
           node-version: 22
           cache: npm