diff --git a/ppx_let.opam b/ppx_let.opam
index 331f34e78..f6e188581 100644
--- a/ppx_let.opam
+++ b/ppx_let.opam
@@ -13,7 +13,7 @@ depends: [
   "ocaml" {>= "4.04.2"}
   "base"
   "dune"   {build & >= "1.5.1"}
-  "ppxlib" {>= "0.4.0"}
+  "ppxlib" {>= "0.5.0"}
 ]
 synopsis: "Monadic let-bindings"
 description: "