diff --git a/.github/workflows/spec.yml b/.github/workflows/spec.yml
index 67e0456..f6b6fda 100644
--- a/.github/workflows/spec.yml
+++ b/.github/workflows/spec.yml
@@ -2,6 +2,8 @@ name: Spec
 
 on:
   push:
+    branches:
+      - master
   pull_request:
 
 permissions: