diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index e245068a..5af200d5 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -19,7 +19,7 @@ jobs:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v20
+        uses: DeterminateSystems/update-flake-lock@v21
         with:
           pr-title: "Update flake.lock" # Title of PR to be created
           inputs: nixpkgs