diff --git a/project.config b/project.config
index 874398d..fa79ca9 100644
--- a/project.config
+++ b/project.config
@@ -8,7 +8,7 @@
 	createNewChangeForAllNotInTarget = false
 	maxObjectSizeLimit = 2m
 	requireSignedPush = false
-	rejectImplicitMerges = false
+	rejectImplicitMerges = true
 [submit]
 	mergeContent = true
 [capability]