diff --git a/.gitmodules b/.gitmodules
index 046ca48..5c2a0a6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "openapi/api"]
 	path = openapi/api
 	url = https://git.ghoscht.com/schnabu/api.git
+	branch = main