diff --git a/.github/workflows/ai-review.yml b/.github/workflows/ai-review.yml
index c3ef059..e1a094a 100644
--- a/.github/workflows/ai-review.yml
+++ b/.github/workflows/ai-review.yml
@@ -13,7 +13,7 @@ jobs:
     name: Review PR with GitHub Models
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c01ab0..5b05148 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     name: Backend — lint, types, tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup backend
         uses: ./.github/actions/setup-backend
@@ -37,7 +37,7 @@ jobs:
     name: Frontend — lint, types, tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup frontend
         uses: ./.github/actions/setup-frontend
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 565e96c..d6af0d9 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -8,7 +8,7 @@ jobs:
     name: Deploy backend → Fly.io
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install flyctl
         uses: superfly/flyctl-actions/setup-flyctl@master
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: deploy-backend
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup frontend
         uses: ./.github/actions/setup-frontend