diff --git a/dune-project b/dune-project
index 728fd8a37eb9..d439aca54577 100644
--- a/dune-project
+++ b/dune-project
@@ -1,4 +1,5 @@
-(lang dune 1.8)
+(lang dune 1.9)
 (name dune)
 
-(implicit_transitive_deps false)
\ No newline at end of file
+(implicit_transitive_deps false)
+(explicit_js_mode)