diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index b0749db..415c553 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -8,6 +8,8 @@ jobs:
   lockfile:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@v1
       - name: Update flake.lock