diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 97bb9f1..907b0aa 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -19,6 +19,6 @@ jobs:
 
     steps:
     - id: deployment
-      uses: sphinx-notes/pages@v3
+      uses: sphinx-notes/pages@dc3b20246f3aa36461db0a9d1a68879df0fd6cc3 # v3
       with:
         python_version: '3.11'
diff --git a/.github/workflows/python-pr.yaml b/.github/workflows/python-pr.yaml
index 8b38c4b..1a75279 100644
--- a/.github/workflows/python-pr.yaml
+++ b/.github/workflows/python-pr.yaml
@@ -3,21 +3,28 @@ name: tests (pull_request)
 on:
   pull_request:
 
+permissions: {}
+
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
     strategy:
       matrix:
         python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/python-publish.yaml b/.github/workflows/python-publish.yaml
index 7aba92a..76fae70 100644
--- a/.github/workflows/python-publish.yaml
+++ b/.github/workflows/python-publish.yaml
@@ -19,10 +19,12 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.x"
 
@@ -35,4 +37,4 @@ jobs:
         run: python -m build -s -w
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@ba38be9e461d3875417946c167d0b5f3d385a247 # v1.14.1
diff --git a/.github/workflows/python-tox.yaml b/.github/workflows/python-tox.yaml
index 02f1092..8e95f65 100644
--- a/.github/workflows/python-tox.yaml
+++ b/.github/workflows/python-tox.yaml
@@ -3,15 +3,22 @@ name: tests
 on:
   push:
 
+permissions: {}
+
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
     strategy:
       matrix:
         python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Get branch name (merge)
         if: github.event_name != 'pull_request'
@@ -28,10 +35,10 @@ jobs:
                >> $GITHUB_ENV
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: ${{ matrix.python-version }}
 
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 0000000..aefcfcf
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,30 @@
+# https://docs.zizmor.sh/integrations/#github-actions
+name: Zizmor (GitHub Actions Security)
+
+on:
+  push:
+    paths:
+      - '.github/workflows/**'
+  pull_request:
+    paths:
+      - '.github/workflows/**'
+
+permissions: {}
+
+concurrency:
+  group: zizmor-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  zizmor:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@6599ee8b7a49aef6a770f63d261d214911a7ce02 # v0.6.0
+        with:
+          advanced-security: false
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8860ab4..79334c1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -47,3 +47,7 @@ repos:
         pass_filenames: false
         args: ["-p", "suitable", "-p", "tests"]
 
+  - repo: https://github.com/zizmorcore/zizmor-pre-commit
+    rev: v1.28.0
+    hooks:
+      - id: zizmor