diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 98a47f3..36224af 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,11 +18,11 @@ jobs:
       matrix:
         python-version: ["3.11", "3.12", "3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: astral-sh/setup-uv@v6
+      - uses: astral-sh/setup-uv@d0cc045d04ccac9d8b7881df0226f9e82c39688e # v6
       - name: Create virtual environment
         run: uv venv --python "${{ matrix.python-version }}" .venv
       - name: Install current Amplifier sources and test runner dependencies