diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 868b71a..c10a86c 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -16,9 +16,9 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5
       - name: Install prek
         run: uv tool install prek
       - name: Run prek
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e39132e..3bc3444 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,12 +10,12 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           submodules: true
           fetch-depth: 0
 
-      - uses: actions/setup-python@v5.2.0
+      - uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3 # v5.2.0
         name: Install Python
         with:
           python-version: "3.11"
@@ -26,7 +26,7 @@ jobs:
           pip install hatch
       - name: Build wheel and sdist
         run: hatch build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: releases
           path: dist
@@ -35,7 +35,7 @@ jobs:
     needs: [build_artifacts]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: releases
           path: dist
@@ -54,9 +54,9 @@ jobs:
       id-token: write
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags/v')
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: releases
           path: dist
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@v1.12.4
+        uses: pypa/gh-action-pypi-publish@76f52bc884231f62b9a034ebfe128415bbaabdfc # v1.12.4
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0738565..94a5a63 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,21 +25,21 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       with:
         fetch-depth: 0  # grab all branches and tags
     - name: Install uv
-      uses: astral-sh/setup-uv@v7
+      uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
       with:
         enable-cache: true
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Run Tests
       run: |
         uv run --all-groups pytest --cov-config=pyproject.toml --cov=pkg --cov-report xml --cov=src
     - name: Upload coverage
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@75cd11691c0faa626561e295848008c8a7dddffe # v5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}