diff --git a/pkgs/development/ocaml-modules/ounit2/default.nix b/pkgs/development/ocaml-modules/ounit2/default.nix
index 0b68609584d4..f1358760696e 100644
--- a/pkgs/development/ocaml-modules/ounit2/default.nix
+++ b/pkgs/development/ocaml-modules/ounit2/default.nix
@@ -1,19 +1,19 @@
-{ lib, ocaml, buildDunePackage, fetchurl, stdlib-shims, ncurses }:
+{ lib, ocaml, buildDunePackage, fetchurl, seq, stdlib-shims, ncurses }:
 
 buildDunePackage rec {
   minimumOCamlVersion = "4.04";
 
   pname = "ounit2";
-  version = "2.2.4";
+  version = "2.2.6";
 
   useDune2 = lib.versionAtLeast ocaml.version "4.08";
 
   src = fetchurl {
-    url = "https://github.com/gildor478/ounit/releases/download/v${version}/ounit-v${version}.tbz";
-    sha256 = "0i9kiqbf2dp12c4qcvbn4abdpdp6h4g5z54ycsh0q8jpv6jnkh5m";
+    url = "https://github.com/gildor478/ounit/releases/download/v${version}/ounit-${version}.tbz";
+    sha256 = "sha256-BpD7Hg6QoY7tXDVms8wYJdmLDox9UbtrhGyVxFphWRM=";
   };
 
-  propagatedBuildInputs = [ stdlib-shims ];
+  propagatedBuildInputs = [ seq stdlib-shims ];
 
   doCheck = true;
   checkInputs = lib.optional (lib.versionOlder ocaml.version "4.07") ncurses;