diff --git a/.github/workflows/user_agent_updater.yml b/.github/workflows/user_agent_updater.yml
index c1713b357f..1e3dae8182 100644
--- a/.github/workflows/user_agent_updater.yml
+++ b/.github/workflows/user_agent_updater.yml
@@ -6,8 +6,6 @@ on:
   schedule:
     # At 00:00 on day-of-month 1.
     - cron: "0 0 1 * *"
-  pull_request_target:
-    types: [closed]
 
 jobs:
   User-agent: