diff --git a/zxcvbn.opam b/zxcvbn.opam
index 324f936..2ebd3d8 100644
--- a/zxcvbn.opam
+++ b/zxcvbn.opam
@@ -14,7 +14,7 @@ run-test: [
 ]
 depends: [
   "dune" {build & >= "1.4.0"}
-  "ocaml" {>= "4.02.0"}
+  "ocaml" {>= "4.04.0"}
   "ounit" {with-test}
   "ppx_deriving" {>= "4.0" & < "5.0"}
 ]