diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -44,8 +44,8 @@
     ui->pruneWarning->setStyleSheet("QLabel { color: red; }");
 
     ui->pruneSize->setEnabled(false);
-    connect(ui->prune, SIGNAL(toggled(bool)), ui->pruneSize,
-            SLOT(setEnabled(bool)));
+    connect(ui->prune, &QPushButton::toggled, ui->pruneSize,
+            &QWidget::setEnabled);
 
 /* Network elements init */
 #ifndef USE_UPNP
@@ -60,21 +60,21 @@
     ui->proxyPortTor->setEnabled(false);
     ui->proxyPortTor->setValidator(new QIntValidator(1, 65535, this));
 
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->proxyIp,
-            SLOT(setEnabled(bool)));
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->proxyPort,
-            SLOT(setEnabled(bool)));
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), this,
-            SLOT(updateProxyValidationState()));
-
-    connect(ui->connectSocksTor, SIGNAL(toggled(bool)), ui->proxyIpTor,
-            SLOT(setEnabled(bool)));
-    connect(ui->connectSocksTor, SIGNAL(toggled(bool)), ui->proxyPortTor,
-            SLOT(setEnabled(bool)));
-    connect(ui->connectSocksTor, SIGNAL(toggled(bool)), this,
-            SLOT(updateProxyValidationState()));
-
-/* Window elements init */
+    connect(ui->connectSocks, &QPushButton::toggled, ui->proxyIp,
+            &QWidget::setEnabled);
+    connect(ui->connectSocks, &QPushButton::toggled, ui->proxyPort,
+            &QWidget::setEnabled);
+    connect(ui->connectSocks, &QPushButton::toggled, this,
+            &OptionsDialog::updateProxyValidationState);
+
+    connect(ui->connectSocksTor, &QPushButton::toggled, ui->proxyIpTor,
+            &QWidget::setEnabled);
+    connect(ui->connectSocksTor, &QPushButton::toggled, ui->proxyPortTor,
+            &QWidget::setEnabled);
+    connect(ui->connectSocksTor, &QPushButton::toggled, this,
+            &OptionsDialog::updateProxyValidationState);
+
+    /* Window elements init */
 #ifdef Q_OS_MAC
     /* remove Window tab on Mac */
     ui->tabWidget->removeTab(ui->tabWidget->indexOf(ui->tabWindow));
@@ -130,14 +130,14 @@
     /* setup/change UI elements when proxy IPs are invalid/valid */
     ui->proxyIp->setCheckValidator(new ProxyAddressValidator(parent));
     ui->proxyIpTor->setCheckValidator(new ProxyAddressValidator(parent));
-    connect(ui->proxyIp, SIGNAL(validationDidChange(QValidatedLineEdit *)),
-            this, SLOT(updateProxyValidationState()));
-    connect(ui->proxyIpTor, SIGNAL(validationDidChange(QValidatedLineEdit *)),
-            this, SLOT(updateProxyValidationState()));
-    connect(ui->proxyPort, SIGNAL(textChanged(const QString &)), this,
-            SLOT(updateProxyValidationState()));
-    connect(ui->proxyPortTor, SIGNAL(textChanged(const QString &)), this,
-            SLOT(updateProxyValidationState()));
+    connect(ui->proxyIp, &QValidatedLineEdit::validationDidChange, this,
+            &OptionsDialog::updateProxyValidationState);
+    connect(ui->proxyIpTor, &QValidatedLineEdit::validationDidChange, this,
+            &OptionsDialog::updateProxyValidationState);
+    connect(ui->proxyPort, &QLineEdit::textChanged, this,
+            &OptionsDialog::updateProxyValidationState);
+    connect(ui->proxyPortTor, &QLineEdit::textChanged, this,
+            &OptionsDialog::updateProxyValidationState);
 }
 
 OptionsDialog::~OptionsDialog() {
@@ -166,29 +166,36 @@
      * here so init via mapper doesn't trigger them) */
 
     /* Main */
-    connect(ui->prune, SIGNAL(clicked(bool)), this, SLOT(showRestartWarning()));
-    connect(ui->prune, SIGNAL(clicked(bool)), this,
-            SLOT(togglePruneWarning(bool)));
-    connect(ui->pruneSize, SIGNAL(valueChanged(int)), this,
-            SLOT(showRestartWarning()));
-    connect(ui->databaseCache, SIGNAL(valueChanged(int)), this,
-            SLOT(showRestartWarning()));
-    connect(ui->threadsScriptVerif, SIGNAL(valueChanged(int)), this,
-            SLOT(showRestartWarning()));
+    connect(ui->prune, &QCheckBox::clicked, this,
+            &OptionsDialog::showRestartWarning);
+    connect(ui->prune, &QCheckBox::clicked, this,
+            &OptionsDialog::togglePruneWarning);
+    connect(ui->pruneSize,
+            static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this,
+            &OptionsDialog::showRestartWarning);
+    connect(ui->databaseCache,
+            static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this,
+            &OptionsDialog::showRestartWarning);
+    connect(ui->threadsScriptVerif,
+            static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this,
+            &OptionsDialog::showRestartWarning);
     /* Wallet */
-    connect(ui->spendZeroConfChange, SIGNAL(clicked(bool)), this,
-            SLOT(showRestartWarning()));
+    connect(ui->spendZeroConfChange, &QCheckBox::clicked, this,
+            &OptionsDialog::showRestartWarning);
     /* Network */
-    connect(ui->allowIncoming, SIGNAL(clicked(bool)), this,
-            SLOT(showRestartWarning()));
-    connect(ui->connectSocks, SIGNAL(clicked(bool)), this,
-            SLOT(showRestartWarning()));
-    connect(ui->connectSocksTor, SIGNAL(clicked(bool)), this,
-            SLOT(showRestartWarning()));
+    connect(ui->allowIncoming, &QCheckBox::clicked, this,
+            &OptionsDialog::showRestartWarning);
+    connect(ui->connectSocks, &QCheckBox::clicked, this,
+            &OptionsDialog::showRestartWarning);
+    connect(ui->connectSocksTor, &QCheckBox::clicked, this,
+            &OptionsDialog::showRestartWarning);
     /* Display */
-    connect(ui->lang, SIGNAL(valueChanged()), this, SLOT(showRestartWarning()));
-    connect(ui->thirdPartyTxUrls, SIGNAL(textChanged(const QString &)), this,
-            SLOT(showRestartWarning()));
+    connect(
+        ui->lang,
+        static_cast<void (QValueComboBox::*)()>(&QValueComboBox::valueChanged),
+        [this] { showRestartWarning(); });
+    connect(ui->thirdPartyTxUrls, &QLineEdit::textChanged,
+            [this] { showRestartWarning(); });
 }
 
 void OptionsDialog::setCurrentTab(OptionsDialog::Tab tab) {
@@ -316,7 +323,7 @@
         // clear non-persistent status label after 10 seconds
         // TODO: should perhaps be a class attribute, if we extend the use of
         // statusLabel
-        QTimer::singleShot(10000, this, SLOT(clearStatusLabel()));
+        QTimer::singleShot(10000, this, &OptionsDialog::clearStatusLabel);
     }
 }