diff --git a/.harness/firebase-deploy.yaml b/.harness/firebase-deploy.yaml
index 18015b9..9ed670d 100644
--- a/.harness/firebase-deploy.yaml
+++ b/.harness/firebase-deploy.yaml
@@ -5,6 +5,7 @@ spec:
     - name: build
       type: ci
       spec:
+        when: build.event == "branch_updated" && build.target == "main"
         steps:
           - name: build
             type: run