diff --git a/.github/workflows/bump-version.yml b/.github/workflows/bump-version.yml
index 8c5a23b..32751da 100644
--- a/.github/workflows/bump-version.yml
+++ b/.github/workflows/bump-version.yml
@@ -9,7 +9,7 @@ jobs:
   bump-version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/create-github-app-token@v3.2.0
+      - uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
         id: app-token
         with:
           app-id: ${{ secrets.CSDA_RELEASE_BOT_CLIENT_ID }}
@@ -17,7 +17,7 @@ jobs:
           owner: ${{ github.repository_owner }}
           repositories: ${{ github.event.repository.name }}
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           token: ${{ steps.app-token.outputs.token }}
 
@@ -32,7 +32,7 @@ jobs:
           fi
 
       - if: steps.check.outputs.should_run == 'true'
-        uses: astral-sh/setup-uv@v7
+        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
 
       - if: steps.check.outputs.should_run == 'true'
         id: bump
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 75203a1..8e3e5aa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: astral-sh/setup-uv@v7
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+      - uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
       - name: Run tests
         run: uv run pytest
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 5ba894e..d3baccf 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -13,7 +13,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/create-github-app-token@v3.2.0
+      - uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
         id: app-token
         with:
           app-id: ${{ secrets.CSDA_RELEASE_BOT_CLIENT_ID }}