diff --git a/.github/workflows/update-flake-lock.yml b/.github/workflows/update-flake-lock.yml
index b14287c..3a84743 100644
--- a/.github/workflows/update-flake-lock.yml
+++ b/.github/workflows/update-flake-lock.yml
@@ -28,7 +28,7 @@ jobs:
 
       - name: Update flake.lock
         id: update
-        uses: DeterminateSystems/update-flake-lock@da2fd6f2563fe3e4f2af8be73b864088564e263d # v20
+        uses: DeterminateSystems/update-flake-lock@a3ccb8f59719c48d6423e97744560221bcf7a3fa # v21
 
       - name: Enable automerge
         if: ${{ steps.update.outputs.pull-request-number != '' }}