diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fbb1aad5e..58ecbfa35 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@
 # limitations under the License.
 name: Continuous Integration
 
-on: push
+on: pull_request
 
 jobs:
   build: