diff --git a/src/document/katedocument.cpp b/src/document/katedocument.cpp
--- a/src/document/katedocument.cpp
+++ b/src/document/katedocument.cpp
@@ -6060,7 +6060,8 @@
     }
 
     // also catch if the user manually calls delete message
-    connect(message, SIGNAL(closed(KTextEditor::Message *)), SLOT(messageDestroyed(KTextEditor::Message *)));
+    connect(message, &Message::closed,
+            this, &DocumentPrivate::messageDestroyed);
 
     return true;
 }
diff --git a/src/view/katemessagewidget.cpp b/src/view/katemessagewidget.cpp
--- a/src/view/katemessagewidget.cpp
+++ b/src/view/katemessagewidget.cpp
@@ -59,12 +59,14 @@
 
     // create animation controller, and connect widgetHidden() to showNextMessage()
     m_animation = new KateAnimation(m_messageWidget, applyFadeEffect ? KateAnimation::FadeEffect : KateAnimation::GrowEffect);
-    connect(m_animation, SIGNAL(widgetHidden()), this, SLOT(showNextMessage()));
+    connect(m_animation, &KateAnimation::widgetHidden,
+            this, &KateMessageWidget::showNextMessage);
 
     // setup autoHide timer details
     m_autoHideTimer->setSingleShot(true);
 
-    connect(m_messageWidget, SIGNAL(linkHovered(QString)), SLOT(linkHovered(QString)));
+    connect(m_messageWidget, &KMessageWidget::linkHovered,
+            this, &KateMessageWidget::linkHovered);
 }
 
 void KateMessageWidget::showNextMessage()
@@ -86,8 +88,10 @@
     m_messageWidget->setIcon(m_currentMessage->icon());
 
     // connect textChanged() and iconChanged(), so it's possible to change this on the fly
-    connect(m_currentMessage, SIGNAL(textChanged(QString)), m_messageWidget, SLOT(setText(QString)), Qt::UniqueConnection);
-    connect(m_currentMessage, SIGNAL(iconChanged(QIcon)), m_messageWidget, SLOT(setIcon(QIcon)), Qt::UniqueConnection);
+    connect(m_currentMessage, &KTextEditor::Message::textChanged,
+            m_messageWidget, &KMessageWidget::setText, Qt::UniqueConnection);
+    connect(m_currentMessage, &KTextEditor::Message::iconChanged,
+            m_messageWidget, &KMessageWidget::setIcon, Qt::UniqueConnection);
 
     // the enums values do not necessarily match, hence translate with switch
     switch (m_currentMessage->messageType()) {
@@ -127,7 +131,8 @@
     m_autoHideTime = m_currentMessage->autoHide();
     m_autoHideTimer->stop();
     if (m_autoHideTime >= 0) {
-        connect(m_autoHideTimer, SIGNAL(timeout()), m_currentMessage, SLOT(deleteLater()), Qt::UniqueConnection);
+        connect(m_autoHideTimer, &QTimer::timeout,
+                m_currentMessage, &QObject::deleteLater, Qt::UniqueConnection);
         if (m_currentMessage->autoHideMode() == KTextEditor::Message::Immediate) {
             m_autoHideTimer->start(m_autoHideTime == 0 ? s_defaultAutoHideTime : m_autoHideTime);
         }
@@ -195,24 +200,27 @@
     m_messageQueue.insert(i, message);
 
     // catch if the message gets deleted
-    connect(message, SIGNAL(closed(KTextEditor::Message *)), SLOT(messageDestroyed(KTextEditor::Message *)));
+    connect(message, &KTextEditor::Message::closed,
+            this, &KateMessageWidget::messageDestroyed);
 
     if (i == 0 && !m_animation->isHideAnimationRunning()) {
         // if message has higher priority than the one currently shown,
         // then hide the current one and then show the new one.
         if (m_currentMessage) {
             // autoHide timer may be running for currently shown message, therefore
             // simply disconnect autoHide timer to all timeout() receivers
-            disconnect(m_autoHideTimer, SIGNAL(timeout()), nullptr, nullptr);
+            disconnect(m_autoHideTimer, &QTimer::timeout, nullptr, nullptr);
             m_autoHideTimer->stop();
 
             // if there is a current message, the message queue must contain 2 messages
             Q_ASSERT(m_messageQueue.size() > 1);
             Q_ASSERT(m_currentMessage == m_messageQueue[1]);
 
             // a bit unnice: disconnect textChanged() and iconChanged() signals of previously visible message
-            disconnect(m_currentMessage, SIGNAL(textChanged(QString)), m_messageWidget, SLOT(setText(QString)));
-            disconnect(m_currentMessage, SIGNAL(iconChanged(QIcon)), m_messageWidget, SLOT(setIcon(QIcon)));
+            disconnect(m_currentMessage, &KTextEditor::Message::textChanged,
+                       m_messageWidget, &KMessageWidget::setText);
+            disconnect(m_currentMessage, &KTextEditor::Message::iconChanged,
+                       m_messageWidget, &KMessageWidget::setIcon);
 
             m_currentMessage = nullptr;
             m_animation->hide();