diff --git a/.github/workflows/documentation-links.yml b/.github/workflows/documentation-links.yml
index a4de7dc..2c68275 100644
--- a/.github/workflows/documentation-links.yml
+++ b/.github/workflows/documentation-links.yml
@@ -18,7 +18,7 @@ jobs:
   documentation-links:
     runs-on: ubuntu-latest
     steps:
-      - uses: readthedocs/actions/preview@v1
+      - uses: readthedocs/actions/preview@b8bba1484329bda1a3abe986df7ebc80a8950333 # v1.5
         with:
           project-slug: "python-docs-theme-previews"
           single-version: "true"
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 2c301a8..eb37549 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: j178/prek-action@v2
+      - uses: j178/prek-action@cbc2f23eb5539cf20d82d1aabd0d0ecbcc56f4e3 # v2.0.2
diff --git a/.github/workflows/pypi-package.yml b/.github/workflows/pypi-package.yml
index 2734399..306af50 100644
--- a/.github/workflows/pypi-package.yml
+++ b/.github/workflows/pypi-package.yml
@@ -20,10 +20,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
 
       - name: Compile translations
         run: |
@@ -31,7 +31,7 @@ jobs:
           pip install -r requirements.txt
           python babel_runner.py compile
 
-      - uses: hynek/build-and-inspect-python-package@v2
+      - uses: hynek/build-and-inspect-python-package@fe0a0fb1925ca263d076ca4f2c13e93a6e92a33e # v2.17.0
 
   # Upload to real PyPI on GitHub Releases.
   release-pypi:
@@ -49,10 +49,10 @@ jobs:
 
     steps:
       - name: Download packages built by build-and-inspect-python-package
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: Packages
           path: dist
 
       - name: Upload package to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # v1.14.0
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6a10a67..fdd840d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -19,10 +19,10 @@ jobs:
           - python-version: "3.15"
             branch: "main"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
@@ -52,7 +52,7 @@ jobs:
         run: |
           cat ./logs/docsbuild.log
       - name: Upload
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: doc-html-${{ matrix.python-version }}
           path: www/
@@ -66,10 +66,10 @@ jobs:
         # Test minimum supported and latest stable from 3.x series
         python-version: ["3.12", "3"]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
diff --git a/.github/zizmor.yml b/.github/zizmor.yml
index 9b42b47..7c776d5 100644
--- a/.github/zizmor.yml
+++ b/.github/zizmor.yml
@@ -1,10 +1,6 @@
-# Configuration for the zizmor static analysis tool, run via pre-commit in CI
-# https://woodruffw.github.io/zizmor/configuration/
+# Configuration for the zizmor static analysis tool, run via prek in CI
+# https://docs.zizmor.sh/configuration/
 rules:
   dangerous-triggers:
     ignore:
       - documentation-links.yml
-  unpinned-uses:
-    config:
-      policies:
-        "*": ref-pin