diff --git a/pkgs/development/libraries/haskell/foldl/default.nix b/pkgs/development/libraries/haskell/foldl/default.nix
index 926c2a812a0b..5224bf11f291 100644
--- a/pkgs/development/libraries/haskell/foldl/default.nix
+++ b/pkgs/development/libraries/haskell/foldl/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "foldl";
-  version = "1.0.3";
-  sha256 = "0jl50bh7k8wp0nz0s0sb2zwh92yrgsm2l6szib41g7zq34mwamn9";
+  version = "1.0.4";
+  sha256 = "0l5gyaw2rb0wfdm5q13vsxfr0z2y9ad5nsjh605p1jp8i0rgwgkv";
   buildDepends = [ primitive text transformers vector ];
   meta = {
     description = "Composable, streaming, and efficient left folds";