diff --git a/.github/workflows/feature-branch.yml b/.github/workflows/feature-branch.yml
index c25c099..2b9f393 100644
--- a/.github/workflows/feature-branch.yml
+++ b/.github/workflows/feature-branch.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236  # v4
         with:
           python-version: ${{ matrix.python-version }}
           cache: "pip"
@@ -31,7 +31,7 @@ jobs:
           pytest tests --doctest-modules --junitxml=junit/test-results.xml --cov=com --cov-report=xml --cov-report=html
 
       - name: Upload pytest test results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32  # v3
         with:
           name: pytest-results-${{ matrix.python-version }}
           path: junit/test-results-${{ matrix.python-version }}.xml
@@ -47,12 +47,12 @@ jobs:
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
 
       - name: Set up Python environment
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236  # v4
         with:
           python-version: "3.11"
 
       - name: flake8 Lint
-        uses: py-actions/flake8@v2
+        uses: py-actions/flake8@84ec6726560b6d5bd68f2a5bed83d62b52bb50ba  # v2
 
   ruff-lint:
     runs-on: ubuntu-latest
@@ -63,7 +63,7 @@ jobs:
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
 
       - name: Set up Python environment
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236  # v4
         with:
           python-version: "3.11"