diff --git a/.github/workflows/update-flake-lock.yaml b/.github/workflows/update-flake-lock.yaml
index f9f5ec7..7c21d15 100644
--- a/.github/workflows/update-flake-lock.yaml
+++ b/.github/workflows/update-flake-lock.yaml
@@ -1,6 +1,9 @@
 name: "Flake.lock: update Nix dependencies"
 
 on:
+  push:
+    branches:
+      - main
   workflow_dispatch:
   schedule:
     - cron: "0 0 * * 0" # runs weekly on Sunday at 00:00