diff --git a/pkgs/development/libraries/haskell/zlib-conduit/default.nix b/pkgs/development/libraries/haskell/zlib-conduit/default.nix
index e902cce44e5f..cf62afc6c013 100644
--- a/pkgs/development/libraries/haskell/zlib-conduit/default.nix
+++ b/pkgs/development/libraries/haskell/zlib-conduit/default.nix
@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self: {
   pname = "zlib-conduit";
-  version = "0.5.0.3";
-  sha256 = "05rlbyxcwq952psbfp94irmygabqxyf1kkm80pwdanlaaky03nsb";
+  version = "1.0.0";
+  sha256 = "0q0l4qw1f2cwjj71n4i082ba47x1xba695q8xk0ky2vw5s8cg0bv";
   buildDepends = [ conduit transformers void zlibBindings ];
   meta = {
     homepage = "http://github.com/snoyberg/conduit";