diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5605b2..8dae988 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,11 +7,7 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-# Find Qt
-if (NOT QT_VERSION_MAJOR)
-    set(QT_VERSION_MAJOR 6)
-endif ()
-find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets Network Svg LinguistTools)
+find_package(Qt6 REQUIRED COMPONENTS Widgets Network Svg LinguistTools QuickControls2)
 
 if (NKR_CROSS)
     set_property(TARGET Qt6::moc PROPERTY IMPORTED_LOCATION /usr/bin/moc)
@@ -243,7 +239,7 @@ target_sources(nekoray PRIVATE ${CMAKE_BINARY_DIR}/translations.qrc)
 # Target Link
 
 target_link_libraries(nekoray PRIVATE
-        Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Network Qt${QT_VERSION_MAJOR}::Svg
+        Qt6::Widgets Qt6::Network Qt6::Svg
         Threads::Threads
         ${NKR_EXTERNAL_TARGETS}
         ${PLATFORM_LIBRARIES}
diff --git a/libs/build_deps_all.sh b/libs/build_deps_all.sh
index a17b803..86c4b1f 100755
--- a/libs/build_deps_all.sh
+++ b/libs/build_deps_all.sh
@@ -27,8 +27,8 @@ clean() {
   rm -rf dl.zip yaml-* zxing-* protobuf
 }
 
-#### ZXing v2.0.0 ####
-curl -L -o dl.zip https://github.com/nu-book/zxing-cpp/archive/refs/tags/v2.0.0.zip
+#### ZXing v2.2.0 ####
+curl -L -o dl.zip https://github.com/nu-book/zxing-cpp/archive/refs/tags/v2.2.0.zip
 unzip dl.zip
 
 cd zxing-*
diff --git a/main/main.cpp b/main/main.cpp
index 9d39351..ad77ac2 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -56,13 +56,7 @@ int main(int argc, char* argv[]) {
     Windows_SetCrashHandler();
 #endif
 
-    // pre-init QApplication
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) && QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
-    QApplication::setAttribute(Qt::AA_DisableWindowContextHelpButton);
-#endif
-#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
     QApplication::setAttribute(Qt::AA_DontUseNativeDialogs);
-#endif
     QApplication::setQuitOnLastWindowClosed(false);
     auto preQApp = new QApplication(argc, argv);
 
@@ -146,12 +140,10 @@ int main(int argc, char* argv[]) {
     MF_release_runguard = [&] { guard.release(); };
 
 // icons
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
     QIcon::setFallbackSearchPaths(QStringList{
         ":/nekoray",
         ":/icon",
     });
-#endif
 
     // icon for no theme
     if (QIcon::themeName().isEmpty()) {
diff --git a/test/test-qt512-sdk-build.sh b/test/test-qt512-sdk-build.sh
deleted file mode 100644
index 9414691..0000000
--- a/test/test-qt512-sdk-build.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-QT=$PWD/qtsdk/5.12.12/gcc_64
-BUILD=build-sdk-qt512
-rm -rf $BUILD
-mkdir -p $BUILD
-cd $BUILD
-cmake -GNinja -DCMAKE_PREFIX_PATH=$QT ..
-ninja
diff --git a/test/test-qt6-build.sh b/test/test-qt6-build.sh
deleted file mode 100644
index 7c1247b..0000000
--- a/test/test-qt6-build.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-rm -rf build-qt6
-mkdir -p build-qt6
-cd build-qt6
-cmake -GNinja -DQT_VERSION_MAJOR=6 ..
-ninja
diff --git a/ui/dialog_basic_settings.cpp b/ui/dialog_basic_settings.cpp
index 44394bb..0db65b8 100644
--- a/ui/dialog_basic_settings.cpp
+++ b/ui/dialog_basic_settings.cpp
@@ -135,8 +135,6 @@ DialogBasicSettings::DialogBasicSettings(QWidget *parent)
     connect(ui->theme, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, [=](int index) {
         themeManager->ApplyTheme(ui->theme->currentText());
         NekoGui::dataStore->theme = ui->theme->currentText();
-        repaint();
-        mainwindow->repaint();
         NekoGui::dataStore->Save();
     });
 
diff --git a/ui/mainwindow.cpp b/ui/mainwindow.cpp
index bdc9924..910d672 100644
--- a/ui/mainwindow.cpp
+++ b/ui/mainwindow.cpp
@@ -22,10 +22,7 @@
 #include "3rdparty/VT100Parser.hpp"
 #include "3rdparty/qv2ray/v2/components/proxy/QvProxyConfigurator.hpp"
 #include "3rdparty/qv2ray/v2/ui/LogHighlighter.hpp"
-
-#ifndef NKR_NO_ZXING
 #include "3rdparty/ZxingQtReader.hpp"
-#endif
 
 #ifdef Q_OS_WIN
 #include "3rdparty/WinCommander.hpp"