diff --git a/pkgs/development/libraries/haskell/attoparsec/enumerator.nix b/pkgs/development/libraries/haskell/attoparsec/enumerator.nix
index ee4b42a49bd..d52687d8080 100644
--- a/pkgs/development/libraries/haskell/attoparsec/enumerator.nix
+++ b/pkgs/development/libraries/haskell/attoparsec/enumerator.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "attoparsec-enumerator";
-  version = "0.3";
-  sha256 = "1sfqcr1mvny9gf0zzggwvs2b20knxrbb208rzaa86ay0b5b5jw5v";
+  version = "0.3.1";
+  sha256 = "10h6i23vhcishp599s4lbp0c46wcba99w6iv4ickdr1avrm9z2m7";
   buildDepends = [ attoparsec enumerator text ];
   meta = {
     homepage = "https://john-millikin.com/software/attoparsec-enumerator/";