diff --git a/pkgs/development/libraries/haskell/yesod/default.nix b/pkgs/development/libraries/haskell/yesod/default.nix
index ebb46f68bc8..e51ca16aa4f 100644
--- a/pkgs/development/libraries/haskell/yesod/default.nix
+++ b/pkgs/development/libraries/haskell/yesod/default.nix
@@ -12,8 +12,8 @@
 
 cabal.mkDerivation (self: {
   pname = "yesod";
-  version = "1.1.9";
-  sha256 = "0fcvf0bg7dsrka639q20dncinqq0fdv21zyvwpx63qfcmilhmjlm";
+  version = "1.1.9.1";
+  sha256 = "0kysj3akf2pvhsiy6f8yfs41mrya86b8ddskqzzibjmdyipiqksj";
   isLibrary = true;
   isExecutable = true;
   buildDepends = [