diff --git a/pkgs/development/libraries/haskell/wai/default.nix b/pkgs/development/libraries/haskell/wai/default.nix
index f1922a95b7e..deb1090dd4a 100644
--- a/pkgs/development/libraries/haskell/wai/default.nix
+++ b/pkgs/development/libraries/haskell/wai/default.nix
@@ -4,8 +4,8 @@
 
 cabal.mkDerivation (self: {
   pname = "wai";
-  version = "1.3.0.3";
-  sha256 = "091qykycxfh9f1jysdjxkw4msdgxp796as3yzv9sgqsxvz58rv1n";
+  version = "1.4.0";
+  sha256 = "1213sib2qp1xafrrnmkxabgkba0g00awy6dx9jnlfkj5r6m32wdq";
   buildDepends = [
     blazeBuilder conduit httpTypes network text transformers vault
   ];