diff --git a/pkgs/development/libraries/haskell/transformers-base/default.nix b/pkgs/development/libraries/haskell/transformers-base/default.nix
index e323905f81b..ea48a566dc0 100644
--- a/pkgs/development/libraries/haskell/transformers-base/default.nix
+++ b/pkgs/development/libraries/haskell/transformers-base/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "transformers-base";
-  version = "0.4.1";
-  sha256 = "1d3w7k7smvdnnn4q6xpdhsj9zvj6372ihyhz4lrhdvgh72pfiaag";
+  version = "0.4.2";
+  sha256 = "030w5p209bam77z6grq6279qwvwip1ax7phrc5wanxrshiw8699m";
   buildDepends = [ transformers ];
   meta = {
     homepage = "https://github.com/mvv/transformers-base";