diff --git a/pkgs/development/compilers/ocaml/4.09.nix b/pkgs/development/compilers/ocaml/4.09.nix
new file mode 100644
index 00000000000..4b56d82eba5
--- /dev/null
+++ b/pkgs/development/compilers/ocaml/4.09.nix
@@ -0,0 +1,6 @@
+import ./generic.nix {
+  major_version = "4";
+  minor_version = "09";
+  patch_version = "0";
+  sha256 = "1v3z5ar326f3hzvpfljg4xj8b9lmbrl53fn57yih1bkbx3gr3yzj";
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 23c0643f1c4..ce0a6fe5bfb 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1133,7 +1133,9 @@ in let inherit (pkgs) callPackage; in rec
 
   ocamlPackages_4_08 = mkOcamlPackages (callPackage ../development/compilers/ocaml/4.08.nix { });
 
-  ocamlPackages_latest = ocamlPackages_4_08;
+  ocamlPackages_4_09 = mkOcamlPackages (callPackage ../development/compilers/ocaml/4.09.nix { });
+
+  ocamlPackages_latest = ocamlPackages_4_09;
 
   ocamlPackages = ocamlPackages_4_06;
 }