diff --git a/pkgs/development/libraries/haskell/bytestring-lexing/default.nix b/pkgs/development/libraries/haskell/bytestring-lexing/default.nix
index 77bf20f3d81..93c8b2aa229 100644
--- a/pkgs/development/libraries/haskell/bytestring-lexing/default.nix
+++ b/pkgs/development/libraries/haskell/bytestring-lexing/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "bytestring-lexing";
-  version = "0.4.2";
-  sha256 = "0s9rip1ik7f29n2i88277vhy7dqhc2bb5bb9l6fd47disb78ic9h";
+  version = "0.4.3";
+  sha256 = "0dynfrf8ym01v2dl57422h8r75kdlqh2qzqi9yc0f1bmbfqxap6r";
   buildTools = [ alex ];
   meta = {
     homepage = "http://code.haskell.org/~wren/";