diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 68d45730d27f..1f768d7cbc5e 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1234,5 +1234,5 @@ in let inherit (pkgs) callPackage; in rec
 
   ocamlPackages_latest = ocamlPackages_4_10;
 
-  ocamlPackages = ocamlPackages_4_08;
+  ocamlPackages = ocamlPackages_4_09;
 }