diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2382f0b..e26611d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     name: flutter analyze + test + build apk
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.2
 
       - name: Setup Java 17 (Android build)
         uses: actions/setup-java@v5
diff --git a/.github/workflows/gitleaks.yml b/.github/workflows/gitleaks.yml
index 72b52cd..5a997a7 100644
--- a/.github/workflows/gitleaks.yml
+++ b/.github/workflows/gitleaks.yml
@@ -29,7 +29,7 @@ jobs:
     name: gitleaks (secret scan)
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6.0.2
         with:
           fetch-depth: 0  # full history so commit-range scan covers the whole tree
       - name: Install gitleaks
diff --git a/.github/workflows/link-check.yml b/.github/workflows/link-check.yml
index ec02b2d..1e15c45 100644
--- a/.github/workflows/link-check.yml
+++ b/.github/workflows/link-check.yml
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
 
       - name: Run lychee
         uses: lycheeverse/lychee-action@8646ba30535128ac92d33dfc9133794bfdd9b411  # v2.8.0