diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index 81ea8cc..b925d7e 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -13,7 +13,7 @@ jobs:
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@v10
       - name: update
-        uses: DeterminateSystems/update-flake-lock@v20
+        uses: DeterminateSystems/update-flake-lock@v21
         with:
           pr-title: "Update flake.lock" 
       - name: merge