diff --git a/packages/jackline.0.1~dev/opam b/packages/jackline.0.1~dev/opam
index 1cc2734..091ab61 100644
--- a/packages/jackline.0.1~dev/opam
+++ b/packages/jackline.0.1~dev/opam
@@ -26,7 +26,7 @@ homepage: "https://github.com/hannesm/jackline"
 bug-reports: "https://github.com/hannesm/jackline/issues"
 depends: [
   "dune" {>= "2.5"}
-  "ocaml" {>= "4.08"}
+  "ocaml" {>= "4.08" & < "5.0.0"}
   "ppx_sexp_conv" {build}
   "ppx_deriving" {>= "0.14.0"}
   "erm_xmpp" {> "0.3"}