diff --git a/.gitmodules b/.gitmodules
index 7be0d2d48e44c79c5f7d51cbf90be2a3c934851c..ca57e24332d29942a9e64117fb83f3bd99ed30c1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "app"]
 	path = app
 	url = https://gitlab.eclipse.org/eclipse/xfsc/tsa/cache.git
+  branch = main