diff --git a/packages/melange/melange.4.0.0-51/opam b/packages/melange/melange.4.0.0-51/opam
index a932101359f..855095b905c 100644
--- a/packages/melange/melange.4.0.0-51/opam
+++ b/packages/melange/melange.4.0.0-51/opam
@@ -7,7 +7,7 @@ homepage: "https://github.com/melange-re/melange"
 bug-reports: "https://github.com/melange-re/melange/issues"
 depends: [
   "dune" {>= "3.13"}
-  "ocaml" {>= "5.1" & < "5.2"}
+  "ocaml" {>= "5.1.1" & < "5.2"}
   "cmdliner" {>= "1.1.0"}
   "dune-build-info"
   "cppo" {build}