diff --git a/pkgs/tools/text/kdiff3/default.nix b/pkgs/tools/text/kdiff3/default.nix
index c230278c0a0..1362591e24c 100644
--- a/pkgs/tools/text/kdiff3/default.nix
+++ b/pkgs/tools/text/kdiff3/default.nix
@@ -1,26 +1,38 @@
-{
-  mkDerivation, lib, fetchurl,
-  extra-cmake-modules, kdoctools, wrapGAppsHook,
-  kcrash, kconfig, kinit, kparts, kiconthemes
+{ mkDerivation
+, lib
+, fetchurl
+, extra-cmake-modules
+, kdoctools
+, wrapGAppsHook
+, boost
+, kcrash
+, kconfig
+, kinit
+, kparts
+, kiconthemes
 }:
 
 mkDerivation rec {
   pname = "kdiff3";
-  version = "1.8.5";
+  version = "1.9.4";
 
   src = fetchurl {
     url = "https://download.kde.org/stable/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "sha256-vJL30E6xI/nFbb4wR69nv3FSQPqZSHrB0czypF4IVME=";
+    sha256 = "sha256-oTBxLO7wdN9pFCaQn8SjMrZvTD8UkKVIq1v7RjFsOFo=";
   };
 
+  buildInputs = [ boost ];
+
   nativeBuildInputs = [ extra-cmake-modules kdoctools wrapGAppsHook ];
 
   propagatedBuildInputs = [ kconfig kcrash kinit kparts kiconthemes ];
 
+  cmakeFlags = [ "-Wno-dev" ];
+
   meta = with lib; {
+    description = "Compares and merges 2 or 3 files or directories";
     homepage = "https://invent.kde.org/sdk/kdiff3";
     license = licenses.gpl2Plus;
-    description = "Compares and merges 2 or 3 files or directories";
     maintainers = with maintainers; [ peterhoeg ];
     platforms = with platforms; linux;
   };