diff --git a/src/nostalgia/CMakeLists.txt b/src/nostalgia/CMakeLists.txt
index c314abd2..55c8dc7f 100644
--- a/src/nostalgia/CMakeLists.txt
+++ b/src/nostalgia/CMakeLists.txt
@@ -3,8 +3,8 @@
 
 if(NOSTALGIA_BUILD_TYPE STREQUAL "Native")
 	if(NOSTALGIA_BUILD_STUDIO)
-		find_package(Qt5Widgets REQUIRED)
-		find_package(Qt5QuickWidgets REQUIRED)
+		find_package(Qt6Widgets REQUIRED)
+		find_package(Qt6QuickWidgets REQUIRED)
 	endif()
 endif()
 
diff --git a/src/nostalgia/core/gba/gfx.cpp b/src/nostalgia/core/gba/gfx.cpp
index 6f1f671b..14975ea7 100644
--- a/src/nostalgia/core/gba/gfx.cpp
+++ b/src/nostalgia/core/gba/gfx.cpp
@@ -56,7 +56,6 @@ ox::Error modelRead(T *io, GbaPaletteTarget *t) {
 template<typename T>
 ox::Error modelRead(T *io, GbaTileMapTarget *t) {
 	io->template setTypeInfo<GbaTileMapTarget>();
-
 	uint8_t bpp;
 	int dummy;
 	oxReturnError(io->field("bpp", &bpp));
diff --git a/src/nostalgia/core/studio/CMakeLists.txt b/src/nostalgia/core/studio/CMakeLists.txt
index e3e66aa5..c4800466 100644
--- a/src/nostalgia/core/studio/CMakeLists.txt
+++ b/src/nostalgia/core/studio/CMakeLists.txt
@@ -21,8 +21,8 @@ endif()
 
 target_link_libraries(
 	NostalgiaCore-Studio
-		Qt5::Core
-		Qt5::QuickWidgets
+		Qt6::Core
+		Qt6::QuickWidgets
 		NostalgiaStudio
 		NostalgiaCore-Qt
 		NostalgiaCore
diff --git a/src/nostalgia/core/studio/tilesheeteditor.cpp b/src/nostalgia/core/studio/tilesheeteditor.cpp
index c29bae5c..83718ccb 100644
--- a/src/nostalgia/core/studio/tilesheeteditor.cpp
+++ b/src/nostalgia/core/studio/tilesheeteditor.cpp
@@ -630,7 +630,7 @@ void SheetData::modGteCmd(int color, int mod) {
 	for (int i = 0; i < m_pixels.size(); ++i) {
 		const auto p = m_pixels[i];
 		if (p >= color) {
-			const auto mx = (m_palette.size() - p) - 1;
+			const int mx = (m_palette.size() - p) - 1;
 			cmd->addPixel(i, std::clamp(mod, -p, mx));
 		}
 	}
@@ -666,15 +666,15 @@ std::unique_ptr<NostalgiaGraphic> SheetData::toNostalgiaGraphic() const {
 		ng->pixels.resize(pixelCount / 2);
 		for (std::size_t i = 0; i < pixelCount && i < static_cast<std::size_t>(m_pixels.size()); ++i) {
 			if (i & 1) {
-				ng->pixels[i / 2] |= static_cast<uint8_t>(m_pixels[i]) << 4;
+				ng->pixels[i / 2] |= static_cast<uint8_t>(m_pixels[static_cast<std::intptr_t>(i)]) << 4;
 			} else {
-				ng->pixels[i / 2] = static_cast<uint8_t>(m_pixels[i]);
+				ng->pixels[i / 2] = static_cast<uint8_t>(m_pixels[static_cast<std::intptr_t>(i)]);
 			}
 		}
 	} else {
 		ng->pixels.resize(pixelCount);
 		for (std::size_t i = 0; i < ng->pixels.size(); ++i) {
-			ng->pixels[i] = static_cast<uint8_t>(m_pixels[i]);
+			ng->pixels[i] = static_cast<uint8_t>(m_pixels[static_cast<std::intptr_t>(i)]);
 		}
 	}
 	return ng;
diff --git a/src/nostalgia/studio/CMakeLists.txt b/src/nostalgia/studio/CMakeLists.txt
index c50d5037..48b42387 100644
--- a/src/nostalgia/studio/CMakeLists.txt
+++ b/src/nostalgia/studio/CMakeLists.txt
@@ -53,7 +53,7 @@ add_executable(
 target_link_libraries(
 	NostalgiaStudioJsonTest
 		OxStd
-		Qt5::Widgets
+		Qt6::Widgets
 )
 
 add_test("[nostalgia/studio] NostalgiaStudioJson" NostalgiaStudioJsonTest)
diff --git a/src/nostalgia/studio/lib/CMakeLists.txt b/src/nostalgia/studio/lib/CMakeLists.txt
index 112cb770..4d56074a 100644
--- a/src/nostalgia/studio/lib/CMakeLists.txt
+++ b/src/nostalgia/studio/lib/CMakeLists.txt
@@ -17,7 +17,7 @@ target_include_directories(NostalgiaStudio PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
 
 target_link_libraries(
 	NostalgiaStudio PUBLIC
-		Qt5::Widgets
+		Qt6::Widgets
 		OxFS
 		OxClaw
 )
diff --git a/src/nostalgia/studio/main.cpp b/src/nostalgia/studio/main.cpp
index 4c2907c3..5eb334ba 100644
--- a/src/nostalgia/studio/main.cpp
+++ b/src/nostalgia/studio/main.cpp
@@ -8,6 +8,7 @@
 
 #include <QApplication>
 #include <QDebug>
+#include <QQuickWindow>
 #include <ox/clargs/clargs.hpp>
 #include <ox/std/trace.hpp>
 #include <qdark/theme.hpp>
@@ -17,18 +18,17 @@ using namespace nostalgia::studio;
 
 int main(int argc, char **args) {
 	ox::trace::init();
+	// get profile path from command args
 	ox::ClArgs clargs(argc, const_cast<const char**>(args));
 	QString argProfilePath = clargs.getString("profile", ":/profiles/nostalgia-studio.json").c_str();
-
-	QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-	QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 	QApplication app(argc, args);
-
 	// load theme
 	if constexpr(ox::defines::OS != ox::defines::OS::Darwin) {
 		qdark::load(&app);
 	}
-
+	// force QtQuick to use OpenGL (https://doc.qt.io/qt-6/quick-changes-qt6.html#changes-to-qquickwidget)
+	QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGLRhi);
+	// open window
 	try {
 		MainWindow w(argProfilePath);
 		app.setApplicationName(w.windowTitle());
diff --git a/src/nostalgia/studio/mainwindow.cpp b/src/nostalgia/studio/mainwindow.cpp
index 2e22cd0d..61d34684 100644
--- a/src/nostalgia/studio/mainwindow.cpp
+++ b/src/nostalgia/studio/mainwindow.cpp
@@ -8,7 +8,6 @@
 
 #include <QApplication>
 #include <QDebug>
-#include <QDesktopWidget>
 #include <QDialog>
 #include <QFileDialog>
 #include <QGridLayout>
diff --git a/src/nostalgia/world/studio/CMakeLists.txt b/src/nostalgia/world/studio/CMakeLists.txt
index 583f64b0..58053cea 100644
--- a/src/nostalgia/world/studio/CMakeLists.txt
+++ b/src/nostalgia/world/studio/CMakeLists.txt
@@ -9,8 +9,8 @@ add_library(
 
 target_link_libraries(
 	NostalgiaWorld-Studio
-		Qt5::Core
-		Qt5::Widgets
+		Qt6::Core
+		Qt6::Widgets
 		NostalgiaStudio
 )