diff --git a/.gitmodules b/.gitmodules
index 3d04b8b..d1d518e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "toon-python"]
 	path = toon-python
 	url = https://github.com/toon-format/toon-python.git
+	branch = main