diff --git a/.gitmodules b/.gitmodules
index d125947..aa2e98e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -17,3 +17,4 @@
 [submodule "packages/astchunk-leann"]
 	path = packages/astchunk-leann
 	url = git@github.com:yichuan-w/astchunk-leann.git
+	branch = main