diff --git a/pkgs/development/ocaml-modules/qcheck/core.nix b/pkgs/development/ocaml-modules/qcheck/core.nix
index f80eff860259..19f8c8cf9ac5 100644
--- a/pkgs/development/ocaml-modules/qcheck/core.nix
+++ b/pkgs/development/ocaml-modules/qcheck/core.nix
@@ -7,13 +7,13 @@
 
 buildDunePackage (finalAttrs: {
   pname = "qcheck-core";
-  version = "0.27";
+  version = "0.91";
 
   src = fetchFromGitHub {
     owner = "c-cube";
     repo = "qcheck";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-UfBfFVSvDeVPUakj2GQCRy5G5IZBxrgdceYtj+VAYbg=";
+    hash = "sha256-ToF+bRbiq1P5YaGOKiW//onJDhxaxmnaz9/JbJ82OWM=";
   };
 
   doCheck = true;