diff --git a/pkgs/development/libraries/haskell/yesod-core/default.nix b/pkgs/development/libraries/haskell/yesod-core/default.nix
index 789d158fa6c..86b2eec8945 100644
--- a/pkgs/development/libraries/haskell/yesod-core/default.nix
+++ b/pkgs/development/libraries/haskell/yesod-core/default.nix
@@ -4,21 +4,22 @@
 , httpTypes, HUnit, liftedBase, monadControl, monadLogger, parsec
 , pathPieces, QuickCheck, random, resourcet, safe, shakespeare
 , shakespeareCss, shakespeareI18n, shakespeareJs, text, time
-, transformers, transformersBase, vector, wai, waiExtra, waiTest
-, warp, yesodRoutes
+, transformers, transformersBase, unixCompat, vector, wai, waiExtra
+, waiLogger, waiTest, warp, yesodRoutes
 }:
 
 cabal.mkDerivation (self: {
   pname = "yesod-core";
-  version = "1.2.5";
-  sha256 = "0ia5j6vnxy32y6776wlsfcv9d6s7slqpmkhxw3pipcqd5sjn4kf9";
+  version = "1.2.6.1";
+  sha256 = "12w8lxkxdwf2pfanz33grciyh4ijn6nzrz4lm478w20y9frmf1nm";
   buildDepends = [
     aeson attoparsecConduit blazeBuilder blazeHtml blazeMarkup
     caseInsensitive cereal clientsession conduit cookie dataDefault
     failure fastLogger hamlet httpTypes liftedBase monadControl
     monadLogger parsec pathPieces random resourcet safe shakespeare
     shakespeareCss shakespeareI18n shakespeareJs text time transformers
-    transformersBase vector wai waiExtra warp yesodRoutes
+    transformersBase unixCompat vector wai waiExtra waiLogger warp
+    yesodRoutes
   ];
   testDepends = [
     blazeBuilder conduit hamlet hspec httpTypes HUnit liftedBase