diff --git a/dispatch-js.opam b/dispatch-js.opam
index 4649af3..c9707ea 100644
--- a/dispatch-js.opam
+++ b/dispatch-js.opam
@@ -8,7 +8,7 @@ depends: [
   "ocaml" {>= "4.03.0"}
   "dune" {build & >= "1.0"}
   "dispatch" {>="0.4.0"}
-  "js_of_ocaml-lwt" {>="3.3.0"}
+  "js_of_ocaml-lwt" {>="3.3.0" & < "3.5.0"}
   "result"
 ]
 build: [