diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 26eda6d..b0d76a6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,7 @@ jobs:
     name: Run all checks
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: DeterminateSystems/determinate-nix-action@v3
       - uses: DeterminateSystems/flakehub-cache-action@main
       - name: Install pnpm dependencies
diff --git a/.github/workflows/update-downstream.yml b/.github/workflows/update-downstream.yml
index 67dea88..326ac3e 100644
--- a/.github/workflows/update-downstream.yml
+++ b/.github/workflows/update-downstream.yml
@@ -40,7 +40,7 @@ jobs:
       GH_TOKEN: ${{ secrets.detsys_pr_bot_token }} # for `gh pr create`
     steps:
       - name: Check out detsys-ts
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           path: current
           token: ${{ env.GH_TOKEN }}
@@ -53,7 +53,7 @@ jobs:
           echo "msg=${MSG}" >> $GITHUB_OUTPUT
 
       - name: Check out ${{ env.TARGET_REPO }}
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           path: target
           repository: ${{ env.TARGET_REPO }}