diff --git a/UI/hotkey-edit.cpp b/UI/hotkey-edit.cpp
index d2846f97a..5307c0ca4 100644
--- a/UI/hotkey-edit.cpp
+++ b/UI/hotkey-edit.cpp
@@ -419,7 +419,11 @@ static inline void updateStyle(QWidget *widget)
 	widget->update();
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+void OBSHotkeyWidget::enterEvent(QEnterEvent *event)
+#else
 void OBSHotkeyWidget::enterEvent(QEvent *event)
+#endif
 {
 	if (!label)
 		return;
@@ -448,7 +452,11 @@ void OBSHotkeyLabel::highlightPair(bool highlight)
 	updateStyle(this);
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+void OBSHotkeyLabel::enterEvent(QEnterEvent *event)
+#else
 void OBSHotkeyLabel::enterEvent(QEvent *event)
+#endif
 {
 	if (!pairPartner)
 		return;
diff --git a/UI/hotkey-edit.hpp b/UI/hotkey-edit.hpp
index b6e1c1411..c625e3a8e 100644
--- a/UI/hotkey-edit.hpp
+++ b/UI/hotkey-edit.hpp
@@ -36,7 +36,11 @@ public:
 	QPointer<OBSHotkeyLabel> pairPartner;
 	QPointer<OBSHotkeyWidget> widget;
 	void highlightPair(bool highlight);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	void enterEvent(QEnterEvent *event) override;
+#else
 	void enterEvent(QEvent *event) override;
+#endif
 	void leaveEvent(QEvent *event) override;
 	void setToolTip(const QString &toolTip);
 };
@@ -131,7 +135,11 @@ public:
 	void Save();
 	void Save(std::vector<obs_key_combination_t> &combinations);
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	void enterEvent(QEnterEvent *event) override;
+#else
 	void enterEvent(QEvent *event) override;
+#endif
 	void leaveEvent(QEvent *event) override;
 
 private:
diff --git a/UI/log-viewer.cpp b/UI/log-viewer.cpp
index 837d6a971..ca3e4c00b 100644
--- a/UI/log-viewer.cpp
+++ b/UI/log-viewer.cpp
@@ -101,7 +101,11 @@ void OBSLogViewer::InitLog()
 
 	if (file.open(QIODevice::ReadOnly)) {
 		QTextStream in(&file);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+		in.setEncoding(QStringConverter::Utf8);
+#else
 		in.setCodec("UTF-8");
+#endif
 
 		while (!in.atEnd()) {
 			QString line = in.readLine();
diff --git a/UI/qt-wrappers.cpp b/UI/qt-wrappers.cpp
index 6967f5a73..545272739 100644
--- a/UI/qt-wrappers.cpp
+++ b/UI/qt-wrappers.cpp
@@ -31,7 +31,6 @@
 
 #if !defined(_WIN32) && !defined(__APPLE__)
 #include <obs-nix-platform.h>
-#include <QX11Info>
 #endif
 
 #ifdef ENABLE_WAYLAND
diff --git a/UI/qt-wrappers.hpp b/UI/qt-wrappers.hpp
index 5042487e0..89948df06 100644
--- a/UI/qt-wrappers.hpp
+++ b/UI/qt-wrappers.hpp
@@ -28,7 +28,12 @@
 #include <memory>
 #include <vector>
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#define QT_UTF8(str) QString::fromUtf8(str, -1)
+#else
 #define QT_UTF8(str) QString::fromUtf8(str)
+#endif
+
 #define QT_TO_UTF8(str) str.toUtf8().constData()
 
 class QDataStream;
diff --git a/UI/source-tree.cpp b/UI/source-tree.cpp
index 46f5c247d..f7dd79ce2 100644
--- a/UI/source-tree.cpp
+++ b/UI/source-tree.cpp
@@ -147,7 +147,7 @@ SourceTreeItem::SourceTreeItem(SourceTree *tree_, OBSSceneItem sceneitem_)
 void SourceTreeItem::paintEvent(QPaintEvent *event)
 {
 	QStyleOption opt;
-	opt.init(this);
+	opt.initFrom(this);
 	QPainter p(this);
 	style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
 
@@ -305,7 +305,11 @@ void SourceTreeItem::mouseDoubleClickEvent(QMouseEvent *event)
 	}
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+void SourceTreeItem::enterEvent(QEnterEvent *event)
+#else
 void SourceTreeItem::enterEvent(QEvent *event)
+#endif
 {
 	QWidget::enterEvent(event);
 
diff --git a/UI/source-tree.hpp b/UI/source-tree.hpp
index 329108f94..c0fdcbfd8 100644
--- a/UI/source-tree.hpp
+++ b/UI/source-tree.hpp
@@ -32,7 +32,11 @@ class SourceTreeItem : public QWidget {
 	friend class SourceTreeModel;
 
 	void mouseDoubleClickEvent(QMouseEvent *event) override;
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	void enterEvent(QEnterEvent *event) override;
+#else
 	void enterEvent(QEvent *event) override;
+#endif
 	void leaveEvent(QEvent *event) override;
 
 	virtual bool eventFilter(QObject *object, QEvent *event) override;
diff --git a/UI/window-basic-main.cpp b/UI/window-basic-main.cpp
index 5a3984d60..5d91c777d 100644
--- a/UI/window-basic-main.cpp
+++ b/UI/window-basic-main.cpp
@@ -24,7 +24,6 @@
 #include <QShowEvent>
 #include <QDesktopServices>
 #include <QFileDialog>
-#include <QDesktopWidget>
 #include <QScreen>
 #include <QColorDialog>
 #include <QSizePolicy>
@@ -73,7 +72,6 @@
 #include <fstream>
 #include <sstream>
 
-#include <QScreen>
 #include <QWindow>
 
 #include <json11.hpp>
@@ -207,8 +205,10 @@ extern void RegisterRestreamAuth();
 OBSBasic::OBSBasic(QWidget *parent)
 	: OBSMainWindow(parent), ui(new Ui::OBSBasic)
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 	qRegisterMetaTypeStreamOperators<SignalContainer<OBSScene>>(
 		"SignalContainer<OBSScene>");
+#endif
 
 	setAttribute(Qt::WA_NativeWindow);
 
@@ -263,10 +263,12 @@ OBSBasic::OBSBasic(QWidget *parent)
 	qRegisterMetaType<obs_hotkey_id>("obs_hotkey_id");
 	qRegisterMetaType<SavedProjectorInfo *>("SavedProjectorInfo *");
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 	qRegisterMetaTypeStreamOperators<std::vector<std::shared_ptr<OBSSignal>>>(
 		"std::vector<std::shared_ptr<OBSSignal>>");
 	qRegisterMetaTypeStreamOperators<OBSScene>("OBSScene");
 	qRegisterMetaTypeStreamOperators<OBSSceneItem>("OBSSceneItem");
+#endif
 
 	ui->scenes->setAttribute(Qt::WA_MacShowFocusRect, false);
 	ui->sources->setAttribute(Qt::WA_MacShowFocusRect, false);
@@ -384,7 +386,8 @@ OBSBasic::OBSBasic(QWidget *parent)
 
 		QRect windowGeometry = normalGeometry();
 		if (!WindowPositionValid(windowGeometry)) {
-			QRect rect = App()->desktop()->geometry();
+			QRect rect =
+				QGuiApplication::primaryScreen()->geometry();
 			setGeometry(QStyle::alignedRect(Qt::LeftToRight,
 							Qt::AlignCenter, size(),
 							rect));
@@ -7286,7 +7289,8 @@ void OBSBasic::OpenSavedProjector(SavedProjectorInfo *info)
 			projector->restoreGeometry(byteArray);
 
 			if (!WindowPositionValid(projector->normalGeometry())) {
-				QRect rect = App()->desktop()->geometry();
+				QRect rect = QGuiApplication::primaryScreen()
+						     ->geometry();
 				projector->setGeometry(QStyle::alignedRect(
 					Qt::LeftToRight, Qt::AlignCenter,
 					size(), rect));
diff --git a/UI/window-basic-settings.cpp b/UI/window-basic-settings.cpp
index a377a1121..6062c5f95 100644
--- a/UI/window-basic-settings.cpp
+++ b/UI/window-basic-settings.cpp
@@ -904,8 +904,8 @@ OBSBasicSettings::OBSBasicSettings(QWidget *parent)
 	channelIndex = ui->channelSetup->currentIndex();
 	sampleRateIndex = ui->sampleRate->currentIndex();
 
-	QRegExp rx("\\d{1,5}x\\d{1,5}");
-	QValidator *validator = new QRegExpValidator(rx, this);
+	QRegularExpression rx("\\d{1,5}x\\d{1,5}");
+	QValidator *validator = new QRegularExpressionValidator(rx, this);
 	ui->baseResolution->lineEdit()->setValidator(validator);
 	ui->outputResolution->lineEdit()->setValidator(validator);
 }
diff --git a/UI/window-basic-stats.cpp b/UI/window-basic-stats.cpp
index 90995ec70..b749d2862 100644
--- a/UI/window-basic-stats.cpp
+++ b/UI/window-basic-stats.cpp
@@ -6,12 +6,12 @@
 #include "obs-app.hpp"
 #include "qt-wrappers.hpp"
 
-#include <QDesktopWidget>
 #include <QPushButton>
 #include <QScrollArea>
 #include <QVBoxLayout>
 #include <QHBoxLayout>
 #include <QGridLayout>
+#include <QScreen>
 
 #include <string>
 
@@ -204,7 +204,8 @@ OBSBasicStats::OBSBasicStats(QWidget *parent, bool closeable)
 
 		QRect windowGeometry = normalGeometry();
 		if (!WindowPositionValid(windowGeometry)) {
-			QRect rect = App()->desktop()->geometry();
+			QRect rect =
+				QGuiApplication::primaryScreen()->geometry();
 			setGeometry(QStyle::alignedRect(Qt::LeftToRight,
 							Qt::AlignCenter, size(),
 							rect));
diff --git a/UI/window-missing-files.cpp b/UI/window-missing-files.cpp
index 65b920b25..c202dd7e3 100644
--- a/UI/window-missing-files.cpp
+++ b/UI/window-missing-files.cpp
@@ -68,7 +68,7 @@ QWidget *MissingFilesPathItemDelegate::createEditor(
 	};
 
 	QHBoxLayout *layout = new QHBoxLayout();
-	layout->setMargin(0);
+	layout->setContentsMargins(0, 0, 0, 0);
 	layout->setSpacing(0);
 
 	QLineEdit *text = new QLineEdit();