diff --git a/pkgs/development/libraries/wt/cmake.patch b/pkgs/development/libraries/wt/cmake.patch
deleted file mode 100644
index e7b1f87411d9..000000000000
--- a/pkgs/development/libraries/wt/cmake.patch
+++ /dev/null
@@ -1,10 +0,0 @@
---- a/CMakeLists.txt	2016-07-13 14:27:26.000000000 +0200
-+++ b/CMakeLists.txt	2016-08-16 12:58:28.135652964 +0200
-@@ -6,6 +6,7 @@
-   CMAKE_POLICY(SET CMP0002 OLD)
-   CMAKE_POLICY(SET CMP0003 OLD)
-   CMAKE_POLICY(SET CMP0005 OLD)
-+  CMAKE_POLICY(SET CMP0037 OLD)
- ENDIF(COMMAND CMAKE_POLICY)
- 
- PROJECT(WT)
diff --git a/pkgs/development/libraries/wt/default.nix b/pkgs/development/libraries/wt/default.nix
index 5d4caed890a8..8dc6db03bc31 100644
--- a/pkgs/development/libraries/wt/default.nix
+++ b/pkgs/development/libraries/wt/default.nix
@@ -4,13 +4,13 @@
 
 stdenv.mkDerivation rec {
   name = "wt";
-  version = "3.3.6";
+  version = "4.0.0";
 
   src = fetchFromGitHub {
     owner = "kdeforche";
     repo = name;
     rev = version;
-    sha256 = "1pvykc969l9cpd0da8bgpi4gr8f6qczrbpprrxamyj1pn0ydzvq3";
+    sha256 = "1451xxvnx6mlvxg0jxlr1mfv5v18h2214kijk5kacilqashfc43i";
   };
 
   enableParallelBuilding = true;
@@ -28,8 +28,6 @@ stdenv.mkDerivation rec {
     "--no-warn-unused-cli"
   ];
 
-  patches = [ ./cmake.patch ];  # fix a cmake warning; PR sent to upstream 
-
   meta = with stdenv.lib; {
     homepage = https://www.webtoolkit.eu/wt;
     description = "C++ library for developing web applications";