diff --git a/.gitea/ci/thirdparty_skills.json b/.gitea/ci/thirdparty_skills.json
index 5864f5fb..50a47439 100644
--- a/.gitea/ci/thirdparty_skills.json
+++ b/.gitea/ci/thirdparty_skills.json
@@ -63,7 +63,7 @@
     {
       "id": "codebase-migrate",
       "upstream_repo": "https://github.com/ComposioHQ/awesome-codex-skills.git",
-      "upstream_ref": "main",
+      "upstream_ref": "master",
       "snapshot_dir": "awesome-codex-skills",
       "sync_mode": "copy_skill_dirs",
       "source_list": "skills/thirdparty/.sources/codebase-migrate.list",
diff --git a/skills/thirdparty/thirdparty-skills.yml b/skills/thirdparty/thirdparty-skills.yml
index 5abe5122..eaf9d768 100644
--- a/skills/thirdparty/thirdparty-skills.yml
+++ b/skills/thirdparty/thirdparty-skills.yml
@@ -43,7 +43,7 @@ skills:
   - id: codebase-migrate
     sync: enabled
     upstream_repo: https://github.com/ComposioHQ/awesome-codex-skills
-    upstream_ref: main
+    upstream_ref: master
     upstream_path: codebase-migrate
     upstream_layout: single_skill_dir
     selected_for:
diff --git a/tests/test_thirdparty_skills_pipeline.py b/tests/test_thirdparty_skills_pipeline.py
index 25f6907a..40fef3d0 100644
--- a/tests/test_thirdparty_skills_pipeline.py
+++ b/tests/test_thirdparty_skills_pipeline.py
@@ -101,6 +101,11 @@ class ThirdpartySkillsPipelineTests(unittest.TestCase):
         migrate = next(
             item for item in data["sources"] if item["id"] == "codebase-migrate"
         )
+        self.assertEqual(
+            migrate["upstream_repo"],
+            "https://github.com/ComposioHQ/awesome-codex-skills.git",
+        )
+        self.assertEqual(migrate["upstream_ref"], "master")
         self.assertEqual(migrate["sync_mode"], "copy_skill_dirs")
         self.assertEqual(migrate["snapshot_dir"], "awesome-codex-skills")
         self.assertEqual(migrate["skills_subdir"], ".")