diff --git a/Makefile b/Makefile
index c581ba0..53b8218 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,7 @@ coverage:
 
 submodule:
 	git submodule update --remote src/cppmdlp
+	git submodule update --merge
 
 lint:  ## Lint and static-check
 	black src