diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index a7683b8..2efc8e5 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -12,9 +12,9 @@ jobs:
   docs-build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set up Python 3.12
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
         with:
           python-version: "3.12"
           cache: "pip"
@@ -28,7 +28,7 @@ jobs:
           sphinx-build -b html docs/ docs/build/
 
       - name: Upload Artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: docs-build
           path: docs/build/
@@ -45,14 +45,14 @@ jobs:
       pages: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Download Artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093  # v4.3.0
         with:
           name: docs-build
           path: docs/build/
 
       - name: Deploy to GitHub pages
-        uses: JamesIves/github-pages-deploy-action@v4
+        uses: JamesIves/github-pages-deploy-action@6c2d9db40f9296374acc17b90404b6e8864128c8  # v4.7.3
         with:
           folder: docs/build/
diff --git a/.github/workflows/pip.yml b/.github/workflows/pip.yml
index f1fc58c..2153ae8 100644
--- a/.github/workflows/pip.yml
+++ b/.github/workflows/pip.yml
@@ -22,9 +22,9 @@ jobs:
 
     steps:
       # actions/setup-python@v5 has built-in functionality for caching and restoring dependencies.
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
         with:
           python-version: ${{ matrix.python-version }}
           cache: "pip" # caching pip dependencies