diff --git a/pkgs/by-name/op/opn2bankeditor/package.nix b/pkgs/by-name/op/opn2bankeditor/package.nix
index 74e6a0e6df99..cb3872eb9850 100644
--- a/pkgs/by-name/op/opn2bankeditor/package.nix
+++ b/pkgs/by-name/op/opn2bankeditor/package.nix
@@ -5,45 +5,39 @@
   unstableGitUpdater,
   cmake,
   pkg-config,
-  # No Qt6 yet: https://github.com/Wohlstand/OPN2BankEditor/issues/126
-  libsForQt5,
+  qt6Packages,
   rtaudio,
   rtmidi,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "opn2bankeditor";
-  version = "1.3-unstable-2026-01-01";
+  version = "1.3-unstable-2026-05-05";
 
   src = fetchFromGitHub {
     owner = "Wohlstand";
     repo = "opn2bankeditor";
-    rev = "0371db0867ac23f49e8d160f9fd3163cf1fe41a2";
+    rev = "c3e12e6b1fc1a6a295fe66c64eceeba5e52832f2";
     fetchSubmodules = true;
-    hash = "sha256-+BgvzZoGAh9KlKjAyn7BsWnfGDB5njW8tJoFwtY0fCo=";
+    hash = "sha256-NosvIFVqu2b0p6QAzd+r5+TcxTNB66PZS358pWB8xpk=";
   };
 
-  # https://github.com/Wohlstand/OPN2BankEditor/issues/125
-  postPatch = ''
-    substituteInPlace CMakeLists.txt \
-      --replace-fail 'cmake_minimum_required(VERSION 3.2)' 'cmake_minimum_required(VERSION 3.2...3.10)'
-  '';
-
   nativeBuildInputs = [
     cmake
     pkg-config
-    libsForQt5.qttools
-    libsForQt5.wrapQtAppsHook
+    qt6Packages.qttools
+    qt6Packages.wrapQtAppsHook
   ];
 
   buildInputs = [
-    libsForQt5.qtbase
-    libsForQt5.qwt
+    qt6Packages.qtbase
+    qt6Packages.qwt
     rtaudio
     rtmidi
   ];
 
   cmakeFlags = [
+    (lib.strings.cmakeFeature "BUILD_MAJOR_QT" "6")
     (lib.strings.cmakeBool "USE_RTAUDIO" true)
     (lib.strings.cmakeBool "USE_RTMIDI" true)
     (lib.strings.cmakeBool "USE_VENDORED_RTAUDIO" false)
@@ -54,7 +48,7 @@ stdenv.mkDerivation (finalAttrs: {
     mkdir $out/{bin,Applications}
     mv "OPN2 Bank Editor.app" $out/Applications/
 
-    install_name_tool -change {,${libsForQt5.qwt}/lib/}libqwt.6.dylib "$out/Applications/OPN2 Bank Editor.app/Contents/MacOS/OPN2 Bank Editor"
+    install_name_tool -change {,${qt6Packages.qwt}/lib/}libqwt.6.dylib "$out/Applications/OPN2 Bank Editor.app/Contents/MacOS/OPN2 Bank Editor"
 
     ln -s "$out/Applications/OPN2 Bank Editor.app/Contents/MacOS/OPN2 Bank Editor" $out/bin/opn2_bank_editor
   '';