diff --git a/pkgs/development/ocaml-modules/uecc/default.nix b/pkgs/development/ocaml-modules/uecc/default.nix
index 5e24f955b17d..efb86d862476 100644
--- a/pkgs/development/ocaml-modules/uecc/default.nix
+++ b/pkgs/development/ocaml-modules/uecc/default.nix
@@ -2,17 +2,15 @@
 
 buildDunePackage rec {
   pname = "uecc";
-  version = "0.3";
+  version = "0.4";
 
   src = fetchFromGitLab {
     owner = "nomadic-labs";
     repo = "ocaml-uecc";
     rev = "v${version}";
-    sha256 = "0m3cw34254baajscrwlrj0jp5n0yad3dhgi4jh3pz89iqykj15fr";
+    hash = "sha256-o/DylUx+olRRloiCU6b1t/xOmW8A5IZB2n3U7fkMo80=";
   };
 
-  useDune2 = true;
-
   propagatedBuildInputs = [
     bigstring
   ];