diff --git a/pkgs/development/tools/ocaml/ocp-indent/default.nix b/pkgs/development/tools/ocaml/ocp-indent/default.nix
index 73c834c6624f..21ff45f76d0d 100644
--- a/pkgs/development/tools/ocaml/ocp-indent/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-indent/default.nix
@@ -7,19 +7,17 @@
 }:
 
 buildDunePackage rec {
-  version = "1.8.2";
+  version = "1.9.0";
   pname = "ocp-indent";
 
-  duneVersion = "3";
-
   src = fetchFromGitHub {
     owner = "OCamlPro";
     repo = "ocp-indent";
-    rev = version;
-    sha256 = "sha256-IyvURw/6R0eKrnahV1fqLV0iIeypykrmxDbliECgbLc=";
+    tag = version;
+    hash = "sha256-71dbZ8c842MYZfHad6RT0E48JlgzJSHnQgLVA5dGLv8=";
   };
 
-  minimalOCamlVersion = "4.03";
+  minimalOCamlVersion = "4.08";
 
   buildInputs = [ cmdliner ];
   propagatedBuildInputs = [ findlib ];