diff --git a/BUILDING.md b/BUILDING.md
index fc6544f0c..82dc66e98 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -16,18 +16,18 @@ General
 
                CONFIG += debug
 
-  QupZilla requires Qt (>= 5.6) and QtWebEngine (at least version included in Qt 5.6)
+  QupZilla requires Qt (>= 5.7) and QtWebEngine (at least version included in Qt 5.7)
 
 Microsoft Windows
 ----------------------------------------------------------------------------------
 
-  You need Microsoft Visual C++ Compiler, Qt Libraries 5.6.0 or higher and openssl
+  You need Microsoft Visual C++ Compiler, Qt Libraries 5.7.0 or higher and openssl
   libraries. in order to build QupZilla.
 
 Linux / Unix
 ----------------------------------------------------------------------------------
 
-  You need to have Qt 5 (>= 5.6) with QtWebEngine.
+  You need to have Qt 5 (>= 5.7) with QtWebEngine.
   Next compulsory requirement is OpenSSL (libcrypto). xcb libraries are also
   required unless you specify NO_X11 build option.
 
@@ -46,7 +46,7 @@ MAC OS X
 
   You need to have Xcode from the Apple App Store installed in Applications, [Command Line Tools for the same Xcode version](https://developer.apple.com/),
   [Homebrew](http://brew.sh/), and `$ brew install openssl` for openssl.
-  Next compulsory requirement is Qt 5 (>= 5.6) with QtWebEngine.
+  Next compulsory requirement is Qt 5 (>= 5.7) with QtWebEngine.
   After successful compilation, you need to run macdeploy.sh script to correctly
   build the application bundle. You will do it with following command:
 
diff --git a/QupZilla.pro b/QupZilla.pro
index df6d1e01f..85fb838e0 100644
--- a/QupZilla.pro
+++ b/QupZilla.pro
@@ -6,12 +6,12 @@
 #
 #-------------------------------------------------
 
-lessThan(QT_VERSION, 5.6) {
-    error("QupZilla requires at least Qt 5.6!")
+lessThan(QT_VERSION, 5.7) {
+    error("QupZilla requires at least Qt 5.7!")
 }
 
-lessThan(QT.webengine.VERSION, 5.6) {
-    error("QupZilla requires at least QtWebEngine 5.6!")
+lessThan(QT.webengine.VERSION, 5.7) {
+    error("QupZilla requires at least QtWebEngine 5.7!")
 }
 
 # Create plugins directory first on Mac / Linux
diff --git a/README.md b/README.md
index 96ef8e753..b20c1644c 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ are using QtWebEngine.
 Compiling
 ----------------------------------------------------------------------------------------
 
-Before you start compiling, make sure that you have installed the Qt (>= 5.6) development libraries
+Before you start compiling, make sure that you have installed the Qt (>= 5.7) development libraries
 and you have read the [BUILDING.md](https://github.com/QupZilla/qupzilla/blob/master/BUILDING.md) information.
 
 **Linux**
diff --git a/src/lib/3rdparty/qtsingleapplication/qtlocalpeer.cpp b/src/lib/3rdparty/qtsingleapplication/qtlocalpeer.cpp
index 56260257e..08b8de450 100644
--- a/src/lib/3rdparty/qtsingleapplication/qtlocalpeer.cpp
+++ b/src/lib/3rdparty/qtsingleapplication/qtlocalpeer.cpp
@@ -128,7 +128,7 @@ bool QtLocalPeer::isClient()
     }
 
     bool res = server->listen(socketName);
-#if defined(Q_OS_UNIX) && (QT_VERSION >= QT_VERSION_CHECK(4,5,0))
+#if defined(Q_OS_UNIX)
     // ### Workaround
     if (!res && server->serverError() == QAbstractSocket::AddressInUseError) {
         QFile::remove(QDir::cleanPath(QDir::tempPath()) + QLatin1Char('/') + socketName);
diff --git a/src/lib/app/browserwindow.cpp b/src/lib/app/browserwindow.cpp
index 115d98137..1509642e3 100644
--- a/src/lib/app/browserwindow.cpp
+++ b/src/lib/app/browserwindow.cpp
@@ -625,7 +625,6 @@ void BrowserWindow::changeEncoding()
 
 void BrowserWindow::printPage()
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     QPrintDialog* dialog = new QPrintDialog(this);
     dialog->setOptions(QAbstractPrintDialog::PrintToFile | QAbstractPrintDialog::PrintShowPageSize);
 #ifndef Q_OS_WIN
@@ -668,7 +667,6 @@ void BrowserWindow::printPage()
             }, dialog->printer()->pageLayout());
         }
     }
-#endif
 }
 
 void BrowserWindow::bookmarkPage()
diff --git a/src/lib/app/mainmenu.cpp b/src/lib/app/mainmenu.cpp
index 7cbf41f90..6896f2372 100644
--- a/src/lib/app/mainmenu.cpp
+++ b/src/lib/app/mainmenu.cpp
@@ -81,9 +81,7 @@ void MainMenu::initSuperMenu(QMenu* superMenu) const
     superMenu->addAction(m_actions[QSL("File/OpenFile")]);
     superMenu->addSeparator();
     superMenu->addAction(m_actions[QSL("File/SendLink")]);
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     superMenu->addAction(m_actions[QSL("File/Print")]);
-#endif
     superMenu->addSeparator();
     superMenu->addAction(m_actions[QSL("Edit/SelectAll")]);
     superMenu->addAction(m_actions[QSL("Edit/Find")]);
@@ -531,13 +529,9 @@ void MainMenu::init()
     ADD_ACTION("File/OpenFile", m_menuFile, QIcon::fromTheme(QSL("document-open")), tr("Open &File..."), SLOT(openFile()), "Ctrl+O");
     ADD_ACTION("File/CloseWindow", m_menuFile, QIcon::fromTheme(QSL("window-close")), tr("Close Window"), SLOT(closeWindow()), "Ctrl+Shift+W");
     m_menuFile->addSeparator();
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     ADD_ACTION("File/SavePageAs", m_menuFile, QIcon::fromTheme(QSL("document-save")), tr("&Save Page As..."), SLOT(savePageAs()), "Ctrl+S");
-#endif
     ADD_ACTION("File/SendLink", m_menuFile, QIcon::fromTheme(QSL("mail-message-new")), tr("Send Link..."), SLOT(sendLink()), "");
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     ADD_ACTION("File/Print", m_menuFile, QIcon::fromTheme(QSL("document-print")), tr("&Print..."), SLOT(printPage()), "Ctrl+P");
-#endif
     m_menuFile->addSeparator();
     m_menuFile->addAction(m_actions[QSL("Standard/Quit")]);
 
diff --git a/src/lib/tabwidget/tabbar.cpp b/src/lib/tabwidget/tabbar.cpp
index b621c2392..cb2fd95f3 100644
--- a/src/lib/tabwidget/tabbar.cpp
+++ b/src/lib/tabwidget/tabbar.cpp
@@ -351,9 +351,7 @@ void TabBar::contextMenuEvent(QContextMenuEvent* event)
         }
 
         menu.addAction(webTab->isPinned() ? tr("Un&pin Tab") : tr("&Pin Tab"), this, SLOT(pinTab()));
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
         menu.addAction(webTab->isMuted() ? tr("Un&mute Tab") : tr("&Mute Tab"), this, SLOT(muteTab()));
-#endif
         menu.addSeparator();
         menu.addAction(tr("Re&load All Tabs"), m_tabWidget, SLOT(reloadAllTabs()));
         menu.addAction(tr("&Bookmark This Tab"), this, SLOT(bookmarkTab()));
diff --git a/src/lib/tabwidget/tabicon.cpp b/src/lib/tabwidget/tabicon.cpp
index 87f928f60..53f1b6ad3 100644
--- a/src/lib/tabwidget/tabicon.cpp
+++ b/src/lib/tabwidget/tabicon.cpp
@@ -139,7 +139,6 @@ void TabIcon::paintEvent(QPaintEvent* event)
 
 void TabIcon::mousePressEvent(QMouseEvent *event)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     qreal x = event->localPos().x();
     qreal y = event->localPos().y();
     // if audio icon is clicked - we don't propagate mouse press to the tab
@@ -147,7 +146,4 @@ void TabIcon::mousePressEvent(QMouseEvent *event)
         m_tab->toggleMuted();
     else
         QWidget::mousePressEvent(event);
-#else
-    QWidget::mousePressEvent(event);
-#endif
 }
diff --git a/src/lib/webengine/webpage.cpp b/src/lib/webengine/webpage.cpp
index eed422855..62d4fd825 100644
--- a/src/lib/webengine/webpage.cpp
+++ b/src/lib/webengine/webpage.cpp
@@ -113,12 +113,7 @@ QVariant WebPage::execJavaScript(const QString &scriptSource, quint32 worldId, i
     QVariant result;
     QTimer::singleShot(timeout, loop.data(), &QEventLoop::quit);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     runJavaScript(scriptSource, worldId, [loop, &result](const QVariant &res) {
-#else
-    Q_UNUSED(worldId);
-    runJavaScript(scriptSource, [loop, &result](const QVariant &res) {
-#endif
         if (loop && loop->isRunning()) {
             result = res;
             loop->quit();
@@ -143,22 +138,12 @@ void WebPage::runJavaScript(const QString &scriptSource, const QWebEngineCallbac
 
 void WebPage::runJavaScript(const QString &scriptSource, quint32 worldId)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     QWebEnginePage::runJavaScript(scriptSource, worldId);
-#else
-    Q_UNUSED(worldId);
-    QWebEnginePage::runJavaScript(scriptSource);
-#endif
 }
 
 void WebPage::runJavaScript(const QString &scriptSource, quint32 worldId, const QWebEngineCallback<const QVariant &> &resultCallback)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     QWebEnginePage::runJavaScript(scriptSource, worldId, resultCallback);
-#else
-    Q_UNUSED(worldId);
-    QWebEnginePage::runJavaScript(scriptSource, resultCallback);
-#endif
 }
 
 QPoint WebPage::mapToViewport(const QPoint &pos) const
@@ -343,11 +328,7 @@ void WebPage::setupWebChannel()
 
     QWebChannel *channel = new QWebChannel(this);
     channel->registerObject(QSL("qz_object"), new ExternalJsObject(this));
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     setWebChannel(channel, SafeJsWorld);
-#else
-    setWebChannel(channel);
-#endif
 
     if (old) {
         delete old->registeredObjects().value(objectName);
diff --git a/src/lib/webengine/webpage.h b/src/lib/webengine/webpage.h
index 5bd91f900..0755610fa 100644
--- a/src/lib/webengine/webpage.h
+++ b/src/lib/webengine/webpage.h
@@ -38,12 +38,8 @@ class QUPZILLA_EXPORT WebPage : public QWebEnginePage
     Q_OBJECT
 public:
     enum JsWorld {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
 //        SafeJsWorld = QWebEngineScript::ApplicationWorld
         SafeJsWorld = QWebEngineScript::MainWorld
-#else
-        SafeJsWorld = QWebEngineScript::MainWorld
-#endif
     };
 
     explicit WebPage(QObject* parent = 0);
diff --git a/src/lib/webengine/webview.cpp b/src/lib/webengine/webview.cpp
index 982baf40c..273a00439 100644
--- a/src/lib/webengine/webview.cpp
+++ b/src/lib/webengine/webview.cpp
@@ -441,9 +441,7 @@ void WebView::copyLinkToClipboard()
 
 void WebView::savePageAs()
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     triggerPageAction(QWebEnginePage::SavePage);
-#endif
 }
 
 void WebView::copyImageToClipboard()
@@ -690,9 +688,7 @@ void WebView::createPageContextMenu(QMenu* menu)
     menu->addAction(pageAction(QWebEnginePage::Stop));
     menu->addSeparator();
     menu->addAction(QIcon::fromTheme("bookmark-new"), tr("Book&mark page"), this, SLOT(bookmarkLink()));
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     menu->addAction(QIcon::fromTheme("document-save"), tr("&Save page as..."), this, SLOT(savePageAs()));
-#endif
     menu->addAction(QIcon::fromTheme("edit-copy"), tr("&Copy page link"), this, SLOT(copyLinkToClipboard()))->setData(url());
     menu->addAction(QIcon::fromTheme("mail-message-new"), tr("Send page link..."), this, SLOT(sendPageByMail()));
     menu->addSeparator();
diff --git a/src/lib/webtab/webtab.cpp b/src/lib/webtab/webtab.cpp
index 9310f7387..7a02ffd9c 100644
--- a/src/lib/webtab/webtab.cpp
+++ b/src/lib/webtab/webtab.cpp
@@ -142,9 +142,7 @@ WebTab::WebTab(BrowserWindow* window)
     connect(m_webView, SIGNAL(loadStarted()), this, SLOT(loadStarted()));
     connect(m_webView, SIGNAL(loadFinished(bool)), this, SLOT(loadFinished()));
     connect(m_webView, SIGNAL(titleChanged(QString)), this, SLOT(titleChanged(QString)));
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     connect(m_webView->page(), &QWebEnginePage::recentlyAudibleChanged, tabIcon(), &TabIcon::updateAudioIcon);
-#endif
 }
 
 TabbedWebView* WebTab::webView() const
@@ -297,20 +295,12 @@ void WebTab::setPinned(bool state)
 
 bool WebTab::isMuted() const
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     return m_webView->page()->isAudioMuted();
-#else
-    return false;
-#endif
 }
 
 void WebTab::setMuted(bool muted)
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5,7,0)
     m_webView->page()->setAudioMuted(muted);
-#else
-    Q_UNUSED(muted)
-#endif
 }
 
 void WebTab::toggleMuted()