diff --git a/packages/slacko/slacko.0.13.0/opam b/packages/slacko/slacko.0.13.0/opam
index be016df14ce..7c92e90fe28 100644
--- a/packages/slacko/slacko.0.13.0/opam
+++ b/packages/slacko/slacko.0.13.0/opam
@@ -18,7 +18,7 @@ depends: [
   "ocamlfind"
   "cmdliner"
   "yojson"
-  "lwt" {>= "2.4.7" & < "4.0.0"}
+  "lwt" {>= "2.4.7"}
   "tls" | "ssl"
   "cohttp" {>= "0.21.1" & <"0.99"}
   "ppx_deriving_yojson" {>= "3.0"}