diff --git a/pkgs/development/libraries/haskell/MFlow/default.nix b/pkgs/development/libraries/haskell/MFlow/default.nix
index f5e088a4238..aaf84a84187 100644
--- a/pkgs/development/libraries/haskell/MFlow/default.nix
+++ b/pkgs/development/libraries/haskell/MFlow/default.nix
@@ -9,8 +9,8 @@
 
 cabal.mkDerivation (self: {
   pname = "MFlow";
-  version = "0.4.5.8";
-  sha256 = "1gfv5ky68dyn8gjjg60c5s9x3dl9xn6j9q43w7vaj9sd1q12wk3c";
+  version = "0.4.5.9";
+  sha256 = "0mqsyx7wkfgvpppqgpjpvzwx79vj7lh4c8afzzj1hgh8z0ilb4ik";
   buildDepends = [
     blazeHtml blazeMarkup caseInsensitive clientsession conduit
     conduitExtra extensibleExceptions httpTypes monadloc mtl parsec