diff --git a/.github/workflows/validate-spec.yml b/.github/workflows/validate-spec.yml
index fd317c8..2e430b1 100644
--- a/.github/workflows/validate-spec.yml
+++ b/.github/workflows/validate-spec.yml
@@ -1,7 +1,7 @@
 name: validate specification
 
 on:
-  push:
+  pull_request:
     branches:
       - master
 
diff --git a/.github/workflows/verify-clients.yml b/.github/workflows/verify-clients.yml
index c924a58..b624143 100644
--- a/.github/workflows/verify-clients.yml
+++ b/.github/workflows/verify-clients.yml
@@ -1,7 +1,7 @@
 name: verify clients
 
 on:
-  push:
+  pull_request:
     branches:
       - master