diff --git a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix
index b0f7b3d54fee..d295bde3ae5e 100644
--- a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix
+++ b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/default.nix
@@ -32,6 +32,7 @@
 , jemalloc
 , rnnoise
 , abseil-cpp
+, kcoreaddons
   # Transitive dependencies:
 , util-linuxMinimal
 , pcre
@@ -73,7 +74,7 @@ let
 in
 env.mkDerivation rec {
   pname = "telegram-desktop";
-  version = "4.1.1";
+  version = "4.2.0";
   # Note: Update via pkgs/applications/networking/instant-messengers/telegram/tdesktop/update.py
 
   # Telegram-Desktop with submodules
@@ -82,7 +83,7 @@ env.mkDerivation rec {
     repo = "tdesktop";
     rev = "v${version}";
     fetchSubmodules = true;
-    sha256 = "0b8nwimks6hfnb3bqik8d4s9z689hhj4p9ykqgc36pmpr54nyma8";
+    sha256 = "1wpqn79pbarz48kmrh6gciw4a9y5hiki5qczlvj8smvx9is6yrf8";
   };
 
   postPatch = ''
@@ -138,6 +139,7 @@ env.mkDerivation rec {
     jemalloc
     rnnoise
     tg_owt
+    kcoreaddons
     # Transitive dependencies:
     util-linuxMinimal # Required for libmount thus not nativeBuildInputs.
     pcre
@@ -194,6 +196,6 @@ env.mkDerivation rec {
     platforms = platforms.linux;
     homepage = "https://desktop.telegram.org/";
     changelog = "https://github.com/telegramdesktop/tdesktop/releases/tag/v${version}";
-    maintainers = with maintainers; [ oxalica ];
+    maintainers = with maintainers; [ nickcao ];
   };
 }
diff --git a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/tg_owt.nix b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/tg_owt.nix
index 590e8f337fe6..c1101a1f2d41 100644
--- a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/tg_owt.nix
+++ b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/tg_owt.nix
@@ -9,13 +9,13 @@
 
 stdenv.mkDerivation {
   pname = "tg_owt";
-  version = "unstable-2022-08-11";
+  version = "unstable-2022-09-14";
 
   src = fetchFromGitHub {
     owner = "desktop-app";
     repo = "tg_owt";
-    rev = "a5fbc9123e056e611e69acf0ceb4252ddd838adb";
-    sha256 = "1hzck63spjjkqzkj0mlrxygrix4lw0n3i5cmc0vkxaphfzawz74n";
+    rev = "621f3da55331733bf0d1b223786b96b68c03dca1";
+    sha256 = "0xh4mm8lpiyj3c62iarsld8q82a1w81x3dxdlcwq8s6sg3r04fns";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/development/libraries/kde-frameworks/default.nix b/pkgs/development/libraries/kde-frameworks/default.nix
index e9a333c98a19..31bce026daa0 100644
--- a/pkgs/development/libraries/kde-frameworks/default.nix
+++ b/pkgs/development/libraries/kde-frameworks/default.nix
@@ -40,7 +40,7 @@ let
     mirror = "mirror://kde";
   };
 
-  mkDerivation = libsForQt5.callPackage ({ mkDerivation }: mkDerivation) {};
+  mkDerivation = libsForQt5.callPackage ({ stdenv, mkDerivation ? stdenv.mkDerivation }: mkDerivation) {};
 
   packages = self: with self;
     # SUPPORT
diff --git a/pkgs/development/libraries/kde-frameworks/kcoreaddons.nix b/pkgs/development/libraries/kde-frameworks/kcoreaddons.nix
index f790d802c0ca..fbd671099465 100644
--- a/pkgs/development/libraries/kde-frameworks/kcoreaddons.nix
+++ b/pkgs/development/libraries/kde-frameworks/kcoreaddons.nix
@@ -1,12 +1,21 @@
 {
-  mkDerivation,
+  mkDerivation, lib,
   extra-cmake-modules,
   qtbase, qttools, shared-mime-info
 }:
 
-mkDerivation {
+mkDerivation ({
   pname = "kcoreaddons";
   nativeBuildInputs = [ extra-cmake-modules ];
   buildInputs = [ qttools shared-mime-info ];
   propagatedBuildInputs = [ qtbase ];
-}
+} // lib.optionalAttrs (lib.versionAtLeast qtbase.version "6") {
+  dontWrapQtApps = true;
+  cmakeFlags = [
+    "-DBUILD_WITH_QT6=ON"
+    "-DEXCLUDE_DEPRECATED_BEFORE_AND_AT=CURRENT"
+  ];
+  postInstall = ''
+    moveToOutput "mkspecs" "$dev"
+  '';
+})
diff --git a/pkgs/top-level/qt6-packages.nix b/pkgs/top-level/qt6-packages.nix
index e6f3b4ae5fd5..3320ff4ee204 100644
--- a/pkgs/top-level/qt6-packages.nix
+++ b/pkgs/top-level/qt6-packages.nix
@@ -14,11 +14,20 @@
 let
   libsForQt6 = self;
   callPackage = self.callPackage;
+  kdeFrameworks = let
+    mkFrameworks = import ../development/libraries/kde-frameworks;
+    attrs = {
+      libsForQt5 = libsForQt6;
+      inherit (pkgs) lib fetchurl;
+    };
+  in (lib.makeOverridable mkFrameworks attrs);
 in
 
 (qt6 // {
   # LIBRARIES
 
+  inherit (kdeFrameworks) kcoreaddons;
+
   quazip = callPackage ../development/libraries/quazip { };
 
   poppler = callPackage ../development/libraries/poppler {