diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 91a00715..ab6dc74c 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -56,6 +56,8 @@ updates:
       timezone: Asia/Tokyo
     cooldown:
       default-days: 7
+      exclude:
+        - "ruby_header_parser"
     open-pull-requests-limit: 99
     assignees:
       - sue445