diff --git a/rpcs3/rpcs3qt/custom_dock_widget.h b/rpcs3/rpcs3qt/custom_dock_widget.h
index 2c54f30ce1..d24725d007 100644
--- a/rpcs3/rpcs3qt/custom_dock_widget.h
+++ b/rpcs3/rpcs3qt/custom_dock_widget.h
@@ -55,7 +55,7 @@ protected:
 		if (isFloating())
 		{
 			QStyleOption opt;
-			opt.init(this);
+			opt.initFrom(this);
 			QPainter p(this);
 			style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
 			return;
diff --git a/rpcs3/rpcs3qt/debugger_frame.cpp b/rpcs3/rpcs3qt/debugger_frame.cpp
index f7d2f4124e..0b66349c79 100644
--- a/rpcs3/rpcs3qt/debugger_frame.cpp
+++ b/rpcs3/rpcs3qt/debugger_frame.cpp
@@ -412,7 +412,7 @@ void debugger_frame::keyPressEvent(QKeyEvent* event)
 				dlg.set_input_font(mono, false);
 				dlg.set_clear_button_enabled(false);
 				dlg.set_button_enabled(QDialogButtonBox::StandardButton::Ok, false);
-				dlg.set_validator(new QRegExpValidator(QRegExp("^[1-9][0-9]*$")));
+				dlg.set_validator(new QRegularExpressionValidator(QRegularExpression("^[1-9][0-9]*$")));
 
 				u32 max = 0;
 
@@ -1010,11 +1010,11 @@ void debugger_frame::ShowGotoAddressDialog()
 
 	if (const auto thread = get_cpu(); !thread || thread->id_type() != 2)
 	{
-		expression_input->setValidator(new QRegExpValidator(QRegExp("^(0[xX])?0*[a-fA-F0-9]{0,8}$")));
+		expression_input->setValidator(new QRegularExpressionValidator(QRegularExpression("^(0[xX])?0*[a-fA-F0-9]{0,8}$")));
 	}
 	else
 	{
-		expression_input->setValidator(new QRegExpValidator(QRegExp("^(0[xX])?0*[a-fA-F0-9]{0,5}$")));
+		expression_input->setValidator(new QRegularExpressionValidator(QRegularExpression("^(0[xX])?0*[a-fA-F0-9]{0,5}$")));
 	}
 
 	// Ok/Cancel
@@ -1058,8 +1058,8 @@ u64 debugger_frame::EvaluateExpression(const QString& expression)
 {
 	bool ok = false;
 
-	// Parse expression(or at least used to, was nuked to remove the need for QtJsEngine)
-	const QString fixed_expression = QRegExp("^[A-Fa-f0-9]+$").exactMatch(expression) ? "0x" + expression : expression;
+	// Parse expression (or at least used to, was nuked to remove the need for QtJsEngine)
+	const QString fixed_expression = QRegularExpression(QRegularExpression::anchoredPattern("a .*|^[A-Fa-f0-9]+$")).match(expression).hasMatch() ? "0x" + expression : expression;
 	const u64 res = static_cast<u64>(fixed_expression.toULong(&ok, 16));
 
 	if (ok) return res;
diff --git a/rpcs3/rpcs3qt/main_window.cpp b/rpcs3/rpcs3qt/main_window.cpp
index 82886558bb..bb7cfa36ee 100644
--- a/rpcs3/rpcs3qt/main_window.cpp
+++ b/rpcs3/rpcs3qt/main_window.cpp
@@ -679,7 +679,7 @@ void main_window::InstallPackages(QStringList file_paths)
 	const auto install_filetype = [&installed_rap_and_edat_count, &file_paths](const std::string extension)
 	{
 		const QString pattern = QString(".*\\.%1").arg(QString::fromStdString(extension));
-		for (const auto& file : file_paths.filter(QRegExp(pattern, Qt::CaseInsensitive)))
+		for (const auto& file : file_paths.filter(QRegularExpression(pattern, QRegularExpression::PatternOption::CaseInsensitiveOption)))
 		{
 			const QFileInfo file_info(file);
 			const std::string filename = sstr(file_info.fileName());
@@ -706,7 +706,7 @@ void main_window::InstallPackages(QStringList file_paths)
 	}
 
 	// Find remaining package files
-	file_paths = file_paths.filter(QRegExp(".*\\.pkg", Qt::CaseInsensitive));
+	file_paths = file_paths.filter(QRegularExpression(".*\\.pkg", QRegularExpression::PatternOption::CaseInsensitiveOption));
 
 	if (!file_paths.isEmpty())
 	{
@@ -1418,7 +1418,7 @@ void main_window::DecryptSPRXLibraries()
 				dlg.set_input_font(mono, true, '0');
 				dlg.set_clear_button_enabled(false);
 				dlg.set_button_enabled(QDialogButtonBox::StandardButton::Ok, false);
-				dlg.set_validator(new QRegExpValidator(QRegExp("^[a-fA-F0-9]*$"))); // HEX only
+				dlg.set_validator(new QRegularExpressionValidator(QRegularExpression("^[a-fA-F0-9]*$"))); // HEX only
 
 				connect(&dlg, &input_dialog::text_changed, &dlg, [&dlg](const QString& text)
 				{
@@ -2885,8 +2885,7 @@ main_window::drop_type main_window::IsValidFile(const QMimeData& md, QStringList
 	for (auto&& url : list) // check each file in url list for valid type
 	{
 		const QString path = url.toLocalFile(); // convert url to filepath
-
-		const QFileInfo info = path;
+		const QFileInfo info(path);
 
 		// check for directories first, only valid if all other paths led to directories until now.
 		if (info.isDir())
diff --git a/rpcs3/rpcs3qt/main_window.h b/rpcs3/rpcs3qt/main_window.h
index 6205ef277f..cf0ee68ee6 100644
--- a/rpcs3/rpcs3qt/main_window.h
+++ b/rpcs3/rpcs3qt/main_window.h
@@ -66,7 +66,6 @@ class main_window : public QMainWindow
 	QWinThumbnailToolButton *m_thumb_playPause = nullptr;
 	QWinThumbnailToolButton *m_thumb_stop = nullptr;
 	QWinThumbnailToolButton *m_thumb_restart = nullptr;
-	QStringList m_vulkan_adapters;
 #endif
 
 	enum class drop_type
diff --git a/rpcs3/rpcs3qt/memory_viewer_panel.cpp b/rpcs3/rpcs3qt/memory_viewer_panel.cpp
index 5bbc09a08e..d7018379c2 100644
--- a/rpcs3/rpcs3qt/memory_viewer_panel.cpp
+++ b/rpcs3/rpcs3qt/memory_viewer_panel.cpp
@@ -81,7 +81,7 @@ memory_viewer_panel::memory_viewer_panel(QWidget* parent, u32 addr, std::functio
 	m_addr_line->setMaxLength(18);
 	m_addr_line->setFixedWidth(75);
 	m_addr_line->setFocus();
-	m_addr_line->setValidator(new QRegExpValidator(QRegExp(m_type == thread_type::spu ? "^(0[xX])?0*[a-fA-F0-9]{0,5}$" : "^(0[xX])?0*[a-fA-F0-9]{0,8}$")));
+	m_addr_line->setValidator(new QRegularExpressionValidator(QRegularExpression(m_type == thread_type::spu ? "^(0[xX])?0*[a-fA-F0-9]{0,5}$" : "^(0[xX])?0*[a-fA-F0-9]{0,8}$")));
 	hbox_tools_mem_addr->addWidget(m_addr_line);
 	tools_mem_addr->setLayout(hbox_tools_mem_addr);
 
diff --git a/rpcs3/rpcs3qt/osk_dialog_frame.cpp b/rpcs3/rpcs3qt/osk_dialog_frame.cpp
index 4e33316c9a..989371c70f 100644
--- a/rpcs3/rpcs3qt/osk_dialog_frame.cpp
+++ b/rpcs3/rpcs3qt/osk_dialog_frame.cpp
@@ -10,7 +10,7 @@
 #include <QTextEdit>
 #include <QHBoxLayout>
 #include <QFormLayout>
-#include <QRegExpValidator>
+#include <QRegularExpressionValidator>
 
 constexpr auto qstr = QString::fromStdString;
 
@@ -70,7 +70,7 @@ void osk_dialog_frame::Create(const std::string& title, const std::u16string& me
 
 		if (prohibit_flags & CELL_OSKDIALOG_NO_SPACE)
 		{
-			input->setValidator(new QRegExpValidator(QRegExp("^\\S*$"), this));
+			input->setValidator(new QRegularExpressionValidator(QRegularExpression("^\\S*$"), this));
 		}
 
 		connect(input, &QLineEdit::textChanged, input_count_label, [input_count_label, charlimit, this](const QString& text)
@@ -122,7 +122,7 @@ void osk_dialog_frame::Create(const std::string& title, const std::u16string& me
 			if (prohibit_flags & CELL_OSKDIALOG_NO_SPACE)
 			{
 				int trim_len = text.length();
-				text.remove(QRegExp("\\s+"));
+				text.remove(QRegularExpression("\\s+"));
 				trim_len -= text.length();
 				cursor_pos -= trim_len;
 			}
diff --git a/rpcs3/rpcs3qt/patch_manager_dialog.cpp b/rpcs3/rpcs3qt/patch_manager_dialog.cpp
index 6ced600e2b..61869f1089 100644
--- a/rpcs3/rpcs3qt/patch_manager_dialog.cpp
+++ b/rpcs3/rpcs3qt/patch_manager_dialog.cpp
@@ -745,8 +745,8 @@ bool patch_manager_dialog::is_valid_file(const QMimeData& md, QStringList* drop_
 
 	for (auto&& url : list) // Check each file in url list for valid type
 	{
-		const QString path   = url.toLocalFile(); // Convert url to filepath
-		const QFileInfo info = path;
+		const QString path = url.toLocalFile(); // Convert url to filepath
+		const QFileInfo info(path);
 
 		if (!info.fileName().endsWith("patch.yml"))
 		{
diff --git a/rpcs3/rpcs3qt/rpcn_settings_dialog.cpp b/rpcs3/rpcs3qt/rpcn_settings_dialog.cpp
index a01acaaf9b..857de64182 100644
--- a/rpcs3/rpcs3qt/rpcn_settings_dialog.cpp
+++ b/rpcs3/rpcs3qt/rpcn_settings_dialog.cpp
@@ -2,7 +2,7 @@
 #include <QHBoxLayout>
 #include <QLabel>
 #include <QPushButton>
-#include <QRegExpValidator>
+#include <QRegularExpressionValidator>
 #include <QInputDialog>
 #include <QGroupBox>
 #include <QMenu>
@@ -101,7 +101,7 @@ rpcn_account_dialog::rpcn_account_dialog(QWidget* parent)
 	QLabel* label_npid = new QLabel(tr("NPID (username):"));
 	m_edit_npid        = new QLineEdit();
 	m_edit_npid->setMaxLength(16);
-	m_edit_npid->setValidator(new QRegExpValidator(QRegExp("^[a-zA-Z0-9_\\-]*$"), this));
+	m_edit_npid->setValidator(new QRegularExpressionValidator(QRegularExpression("^[a-zA-Z0-9_\\-]*$"), this));
 	QLabel* label_pass        = new QLabel(tr("Password:"));
 	QPushButton* btn_chg_pass = new QPushButton(tr("Set Password"));
 	QLabel* label_token       = new QLabel(tr("Token:"));
@@ -229,7 +229,7 @@ void rpcn_account_dialog::create_account()
 		return;
 
 	QString email;
-	const QRegExpValidator simple_email_validator(QRegExp("^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$"));
+	const QRegularExpressionValidator simple_email_validator(QRegularExpression("^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$"));
 
 	while (true)
 	{
diff --git a/rpcs3/rpcs3qt/save_manager_dialog.cpp b/rpcs3/rpcs3qt/save_manager_dialog.cpp
index 4d064edf12..2a245823a9 100644
--- a/rpcs3/rpcs3qt/save_manager_dialog.cpp
+++ b/rpcs3/rpcs3qt/save_manager_dialog.cpp
@@ -33,10 +33,10 @@ namespace
 
 	[[maybe_unused]] inline std::string sstr(const QString& _in) { return _in.toStdString(); }
 
-	QString FormatTimestamp(u64 time)
+	QString FormatTimestamp(s64 time)
 	{
 		QDateTime dateTime;
-		dateTime.setTime_t(time);
+		dateTime.setSecsSinceEpoch(time);
 		return dateTime.toString("yyyy-MM-dd HH:mm:ss");
 	}
 
diff --git a/rpcs3/rpcs3qt/skylander_dialog.cpp b/rpcs3/rpcs3qt/skylander_dialog.cpp
index a13f1a960a..c994c549ab 100644
--- a/rpcs3/rpcs3qt/skylander_dialog.cpp
+++ b/rpcs3/rpcs3qt/skylander_dialog.cpp
@@ -563,12 +563,12 @@ skylander_creator_dialog::skylander_creator_dialog(QWidget* parent)
 	line->setFrameShadow(QFrame::Sunken);
 	vbox_panel->addWidget(line);
 
-	QHBoxLayout* hbox_idvar = new QHBoxLayout();
-	QLabel* label_id        = new QLabel(tr("ID:"));
-	QLabel* label_var       = new QLabel(tr("Variant:"));
-	QLineEdit* edit_id      = new QLineEdit("0");
-	QLineEdit* edit_var     = new QLineEdit("0");
-	QRegExpValidator* rxv   = new QRegExpValidator(QRegExp("\\d*"), this);
+	QHBoxLayout* hbox_idvar          = new QHBoxLayout();
+	QLabel* label_id                 = new QLabel(tr("ID:"));
+	QLabel* label_var                = new QLabel(tr("Variant:"));
+	QLineEdit* edit_id               = new QLineEdit("0");
+	QLineEdit* edit_var              = new QLineEdit("0");
+	QRegularExpressionValidator* rxv = new QRegularExpressionValidator(QRegularExpression("\\d*"), this);
 	edit_id->setValidator(rxv);
 	edit_var->setValidator(rxv);
 	hbox_idvar->addWidget(label_id);
diff --git a/rpcs3/rpcs3qt/user_manager_dialog.cpp b/rpcs3/rpcs3qt/user_manager_dialog.cpp
index bbbfe74a65..0ecf91da3c 100644
--- a/rpcs3/rpcs3qt/user_manager_dialog.cpp
+++ b/rpcs3/rpcs3qt/user_manager_dialog.cpp
@@ -1,4 +1,4 @@
-#include <QRegExpValidator>
+#include <QRegularExpressionValidator>
 #include <QInputDialog>
 #include <QKeyEvent>
 #include <QEvent>
@@ -250,7 +250,7 @@ bool user_manager_dialog::ValidateUsername(const QString& text_to_validate)
 {
 	// "Entire string (^...$) must be between 3 and 16 characters
 	// and only consist of letters, numbers, underscores, and hyphens."
-	const QRegExpValidator validator(QRegExp("^[A-Za-z0-9_-]{3,16}$"));
+	const QRegularExpressionValidator validator(QRegularExpression("^[A-Za-z0-9_-]{3,16}$"));
 
 	int pos = 0;
 	QString text = text_to_validate;