diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88a6c6d..24fb09b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,9 +12,9 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
       with:
         python-version: ${{ matrix.python-version }}
     - name: Unit tests
diff --git a/.github/workflows/linters.yml b/.github/workflows/linters.yml
index e176e2d..29ecc90 100644
--- a/.github/workflows/linters.yml
+++ b/.github/workflows/linters.yml
@@ -7,9 +7,9 @@ jobs:
   linters:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Install Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: "3.13"
       - name: Install dependencies
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index dd6d203..f152fc7 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -9,9 +9,9 @@ jobs:
     name: Build distribution package
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
       with:
         python-version: "3.x"
     - name: Install pypa/build
@@ -23,7 +23,7 @@ jobs:
     - name: Build a binary wheel and a source tarball
       run: python3 -m build
     - name: Store the distribution packages
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
       with:
         name: python-package-distributions
         path: dist/
@@ -42,9 +42,9 @@ jobs:
 
     steps:
     - name: Download all the dists
-      uses: actions/download-artifact@v8
+      uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
       with:
         name: python-package-distributions
         path: dist/
     - name: Publish distribution 📦 to PyPI
-      uses: pypa/gh-action-pypi-publish@release/v1
+      uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1