diff --git a/.github/workflows/python-pr.yaml b/.github/workflows/python-pr.yaml
index e557028..102598c 100644
--- a/.github/workflows/python-pr.yaml
+++ b/.github/workflows/python-pr.yaml
@@ -3,23 +3,30 @@ 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@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
 
       - name: Install dependencies
         run: uv pip install tox tox-gh tox-uv --system
diff --git a/.github/workflows/python-publish.yaml b/.github/workflows/python-publish.yaml
index abb3e92..d75757b 100644
--- a/.github/workflows/python-publish.yaml
+++ b/.github/workflows/python-publish.yaml
@@ -5,6 +5,8 @@ on:
   release:
     types: [created]
 
+permissions: {}
+
 jobs:
   deploy:
 
@@ -15,13 +17,16 @@ jobs:
       url: https://pypi.org/project/libres
 
     permissions:
+      contents: read
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.x"
 
@@ -34,4 +39,4 @@ 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 3f57967..bb17666 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@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Get branch name (merge)
         if: github.event_name != 'pull_request'
@@ -28,12 +35,12 @@ jobs:
                >> $GITHUB_ENV
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
 
       - name: Install dependencies
         run: uv pip install tox tox-gh tox-uv --system
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 0000000..6d0b1ea
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,33 @@
+# 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
+    permissions:
+      contents: read # Required for private repos
+      actions: read # Required for private repos
+    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 48e24df..d1facfa 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -48,4 +48,8 @@ repos:
         #       instead of for every file. So we exclude all files
         exclude: '.*'
         always_run: true
-        pass_filenames: false
\ No newline at end of file
+        pass_filenames: false
+  - repo: https://github.com/zizmorcore/zizmor-pre-commit
+    rev: v1.28.0
+    hooks:
+      - id: zizmor