diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0280bd2..90e59ab 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,13 +25,13 @@ jobs:
           - "3.11"
           - "3.12"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5
         with:
           python-version: ${{ matrix.python-version }}
       - name: Set up uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@e779db74266a80753577425b0f4ee823649f251d # v3
         with:
           enable-cache: true
           cache-dependency-glob: "**/pyproject.toml"