diff --git a/buf.gen.yaml b/buf.gen.yaml
index 85106a5ee..887982cbc 100644
--- a/buf.gen.yaml
+++ b/buf.gen.yaml
@@ -2,7 +2,7 @@
 version: v2
 inputs:
   - git_repo: https://github.com/a2aproject/A2A.git
-    ref: main
+    ref: v1.0.0-rc
     subdir: specification
 managed:
   enabled: true