diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b313668c..a4da313ef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ project(qBittorrent
 set(CMAKE_FIND_PACKAGE_PREFER_CONFIG ON)
 # version requirements - older vesions may work, but you are on your own
 set(minBoostVersion 1.65)
-set(minQtVersion 5.9.5)
+set(minQtVersion 5.12)
 set(minOpenSSLVersion 1.1.1)
 set(minLibtorrentVersion 1.2.12)
 set(minZlibVersion 1.2.11)
diff --git a/configure b/configure
index 2c1033aa5..da4254f38 100755
--- a/configure
+++ b/configure
@@ -1455,7 +1455,7 @@ Some influential environment variables:
               directories to add to pkg-config's search path
   PKG_CONFIG_LIBDIR
               path overriding pkg-config's built-in search path
-  QT_QMAKE    value of host_bins for Qt5Core >= 5.9.5, overriding pkg-config
+  QT_QMAKE    value of host_bins for Qt5Core >= 5.12, overriding pkg-config
   Qt5Svg_CFLAGS
               C compiler flags for Qt5Svg, overriding pkg-config
   Qt5Svg_LIBS linker flags for Qt5Svg, overriding pkg-config
@@ -5525,8 +5525,8 @@ printf "%s\n" "$enable_webui" >&6; }
 esac
 
 if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.9.5\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.9.5") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.12\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.12") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
@@ -5535,12 +5535,12 @@ if test -n "$QT_QMAKE"; then
     pkg_cv_QT_QMAKE="$QT_QMAKE"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.9.5\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.9.5") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.12\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.12") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_QT_QMAKE=`$PKG_CONFIG --variable="host_bins" "Qt5Core >= 5.9.5" 2>/dev/null`
+  pkg_cv_QT_QMAKE=`$PKG_CONFIG --variable="host_bins" "Qt5Core >= 5.12" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5570,8 +5570,8 @@ fi
 
 fi
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5 qmake >= 5.9.5" >&5
-printf %s "checking for Qt5 qmake >= 5.9.5... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5 qmake >= 5.12" >&5
+printf %s "checking for Qt5 qmake >= 5.12... " >&6; }
 if test "x$QT_QMAKE" != "x"
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $QT_QMAKE" >&5
@@ -5598,12 +5598,12 @@ if test -n "$Qt5Svg_CFLAGS"; then
     pkg_cv_Qt5Svg_CFLAGS="$Qt5Svg_CFLAGS"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.5.1\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.5.1") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.12\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.12") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_Qt5Svg_CFLAGS=`$PKG_CONFIG --cflags "Qt5Svg >= 5.5.1" 2>/dev/null`
+  pkg_cv_Qt5Svg_CFLAGS=`$PKG_CONFIG --cflags "Qt5Svg >= 5.12" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5615,12 +5615,12 @@ if test -n "$Qt5Svg_LIBS"; then
     pkg_cv_Qt5Svg_LIBS="$Qt5Svg_LIBS"
  elif test -n "$PKG_CONFIG"; then
     if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.5.1\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.5.1") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.12\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.12") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_Qt5Svg_LIBS=`$PKG_CONFIG --libs "Qt5Svg >= 5.5.1" 2>/dev/null`
+  pkg_cv_Qt5Svg_LIBS=`$PKG_CONFIG --libs "Qt5Svg >= 5.12" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5641,14 +5641,14 @@ else
         _pkg_short_errors_supported=no
 fi
         if test $_pkg_short_errors_supported = yes; then
-	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "Qt5Svg >= 5.5.1" 2>&1`
+	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "Qt5Svg >= 5.12" 2>&1`
         else
-	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "Qt5Svg >= 5.5.1" 2>&1`
+	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "Qt5Svg >= 5.12" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$Qt5Svg_PKG_ERRORS" >&5
 
-	as_fn_error $? "Package requirements (Qt5Svg >= 5.5.1) were not met:
+	as_fn_error $? "Package requirements (Qt5Svg >= 5.12) were not met:
 
 $Qt5Svg_PKG_ERRORS
 
@@ -5688,11 +5688,11 @@ case "x$enable_qt_dbus" in #(
   "xyes") :
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 printf "%s\n" "yes" >&6; }
-               { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5DBus >= 5.9.5" >&5
-printf %s "checking for Qt5DBus >= 5.9.5... " >&6; }
+               { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5DBus >= 5.12" >&5
+printf %s "checking for Qt5DBus >= 5.12... " >&6; }
        if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5DBus >= 5.9.5\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5DBus >= 5.9.5") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5DBus >= 5.12\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5DBus >= 5.12") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
diff --git a/configure.ac b/configure.ac
index dd7a0b9ed..28b14611c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -141,7 +141,7 @@ AS_IF([test "x$QT_QMAKE" = "x"],
       [AC_MSG_ERROR([Could not find qmake])
       ])
 AS_IF([test "x$enable_gui" = "xyes"],
-      [PKG_CHECK_MODULES(Qt5Svg, [Qt5Svg >= 5.5.1])
+      [PKG_CHECK_MODULES(Qt5Svg, [Qt5Svg >= 5.12])
       ])
 AC_MSG_CHECKING([whether QtDBus should be enabled])
 AS_CASE(["x$enable_qt_dbus"],
diff --git a/m4/qbittorrent.m4 b/m4/qbittorrent.m4
index a8c200f45..3526bb4fa 100644
--- a/m4/qbittorrent.m4
+++ b/m4/qbittorrent.m4
@@ -5,9 +5,9 @@
 # Sets the QT_QMAKE variable to the path of Qt5 qmake if found.
 # --------------------------------------
 AC_DEFUN([FIND_QT5],
-[PKG_CHECK_EXISTS([Qt5Core >= 5.9.5],
+[PKG_CHECK_EXISTS([Qt5Core >= 5.12],
                  [PKG_CHECK_VAR(QT_QMAKE,
-                                [Qt5Core >= 5.9.5],
+                                [Qt5Core >= 5.12],
                                 [host_bins])
                  ])
 
@@ -18,7 +18,7 @@ AS_IF([test -f "$QT_QMAKE/qmake"],
                              [QT_QMAKE=""])
               ])
 
-AC_MSG_CHECKING([for Qt5 qmake >= 5.9.5])
+AC_MSG_CHECKING([for Qt5 qmake >= 5.12])
 AS_IF([test "x$QT_QMAKE" != "x"],
       [AC_MSG_RESULT([$QT_QMAKE])],
       [AC_MSG_RESULT([not found])]
@@ -29,8 +29,8 @@ AS_IF([test "x$QT_QMAKE" != "x"],
 # Sets the HAVE_QTDBUS variable to true or false.
 # --------------------------------------
 AC_DEFUN([FIND_QTDBUS],
-       [AC_MSG_CHECKING([for Qt5DBus >= 5.9.5])
-       PKG_CHECK_EXISTS([Qt5DBus >= 5.9.5],
+       [AC_MSG_CHECKING([for Qt5DBus >= 5.12])
+       PKG_CHECK_EXISTS([Qt5DBus >= 5.12],
                         [AC_MSG_RESULT([found])
                          HAVE_QTDBUS=[true]],
                         [AC_MSG_RESULT([not found])
diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index bb1dc4df6..b8c9ec40e 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -4,22 +4,14 @@
 # Based on https://gist.github.com/giraldeau/546ba5512a74dfe9d8ea0862d66db412
 file(GLOB QBT_TS_FILES "${qBittorrent_SOURCE_DIR}/src/lang/*.ts")
 set_source_files_properties(${QBT_TS_FILES} PROPERTIES OUTPUT_LOCATION "${qBittorrent_BINARY_DIR}/src/lang")
-if (Qt5_VERSION VERSION_LESS 5.12)
-    qt5_add_translation(QBT_QM_FILES ${QBT_TS_FILES})
-else()
-    qt5_add_translation(QBT_QM_FILES ${QBT_TS_FILES} OPTIONS -silent)
-endif()
+qt5_add_translation(QBT_QM_FILES ${QBT_TS_FILES} OPTIONS -silent)
 configure_file("${qBittorrent_SOURCE_DIR}/src/lang/lang.qrc" "${qBittorrent_BINARY_DIR}/src/lang/lang.qrc" COPYONLY)
 
 if (WEBUI)
     file(GLOB QBT_WEBUI_TS_FILES "${qBittorrent_SOURCE_DIR}/src/webui/www/translations/*.ts")
     set_source_files_properties(${QBT_WEBUI_TS_FILES}
         PROPERTIES OUTPUT_LOCATION "${qBittorrent_BINARY_DIR}/src/webui/www/translations")
-    if (Qt5_VERSION VERSION_LESS 5.12)
-        qt5_add_translation(QBT_WEBUI_QM_FILES ${QBT_WEBUI_TS_FILES})
-    else()
-        qt5_add_translation(QBT_WEBUI_QM_FILES ${QBT_WEBUI_TS_FILES} OPTIONS -silent)
-    endif()
+    qt5_add_translation(QBT_WEBUI_QM_FILES ${QBT_WEBUI_TS_FILES} OPTIONS -silent)
     configure_file("${qBittorrent_SOURCE_DIR}/src/webui/www/translations/webui_translations.qrc"
         "${qBittorrent_BINARY_DIR}/src/webui/www/translations/webui_translations.qrc" COPYONLY)
 endif()
diff --git a/src/app/application.cpp b/src/app/application.cpp
index a555bffa3..1301c254e 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -359,7 +359,6 @@ void Application::runExternalProgram(const BitTorrent::Torrent *torrent) const
     for (int i = 1; i < argCount; ++i)
         argList += QString::fromWCharArray(args[i]);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QProcess proc;
     proc.setProgram(QString::fromWCharArray(args[0]));
     proc.setArguments(argList);
@@ -385,9 +384,6 @@ void Application::runExternalProgram(const BitTorrent::Torrent *torrent) const
         args->startupInfo->hStdError = nullptr;
     });
     proc.startDetached();
-#else
-    QProcess::startDetached(QString::fromWCharArray(args[0]), argList);
-#endif // QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
 #else // Q_OS_WIN
     // Cannot give users shell environment by default, as doing so could
     // enable command injection via torrent name and other arguments
diff --git a/src/app/main.cpp b/src/app/main.cpp
index b9187c25d..aceb0c1e4 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -235,7 +235,7 @@ int main(int argc, char *argv[])
         // 3. https://bugreports.qt.io/browse/QTBUG-46015
 
         qputenv("QT_BEARER_POLL_TIMEOUT", QByteArray::number(-1));
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)) && !defined(DISABLE_GUI)
+#if !defined(DISABLE_GUI)
         // this is the default in Qt6
         app->setAttribute(Qt::AA_DisableWindowContextHelpButton);
 #endif
@@ -381,11 +381,7 @@ void showSplashScreen()
     const QString version = QBT_VERSION;
     painter.setPen(QPen(Qt::white));
     painter.setFont(QFont("Arial", 22, QFont::Black));
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
     painter.drawText(224 - painter.fontMetrics().horizontalAdvance(version), 270, version);
-#else
-    painter.drawText(224 - painter.fontMetrics().width(version), 270, version);
-#endif
     QSplashScreen *splash = new QSplashScreen(splashImg);
     splash->show();
     QTimer::singleShot(1500, splash, &QObject::deleteLater);
diff --git a/src/base/asyncfilestorage.cpp b/src/base/asyncfilestorage.cpp
index 3b9f61e7b..c2c86d794 100644
--- a/src/base/asyncfilestorage.cpp
+++ b/src/base/asyncfilestorage.cpp
@@ -55,13 +55,8 @@ AsyncFileStorage::~AsyncFileStorage()
 
 void AsyncFileStorage::store(const QString &fileName, const QByteArray &data)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(this, [this, data, fileName]() { store_impl(fileName, data); }
                               , Qt::QueuedConnection);
-#else
-    QMetaObject::invokeMethod(this, "store_impl", Qt::QueuedConnection
-                              , Q_ARG(QString, fileName), Q_ARG(QByteArray, data));
-#endif
 }
 
 QDir AsyncFileStorage::storageDir() const
diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index 880b84a9a..cb5159b53 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -1111,11 +1111,7 @@ void Session::initializeNativeSession()
 
     m_nativeSession->set_alert_notify([this]()
     {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
         QMetaObject::invokeMethod(this, &Session::readAlerts, Qt::QueuedConnection);
-#else
-        QMetaObject::invokeMethod(this, "readAlerts", Qt::QueuedConnection);
-#endif
     });
 
     // Enabling plugins
@@ -1854,18 +1850,13 @@ bool Session::deleteTorrent(const TorrentID &id, const DeleteOption deleteOption
     }
 
     // Remove it from torrent resume directory
-    const QString resumedataFile = QString::fromLatin1("%1.fastresume").arg(torrent->id().toString());
-    const QString metadataFile = QString::fromLatin1("%1.torrent").arg(torrent->id().toString());
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+    const QString resumedataFile = QString::fromLatin1("%1.fastresume").arg(torrent->id());
+    const QString metadataFile = QString::fromLatin1("%1.torrent").arg(torrent->id());
     QMetaObject::invokeMethod(m_resumeDataSavingManager, [this, resumedataFile, metadataFile]()
     {
         m_resumeDataSavingManager->remove(resumedataFile);
         m_resumeDataSavingManager->remove(metadataFile);
     });
-#else
-    QMetaObject::invokeMethod(m_resumeDataSavingManager, "remove", Q_ARG(QString, resumedataFile));
-    QMetaObject::invokeMethod(m_resumeDataSavingManager, "remove", Q_ARG(QString, metadataFile));
-#endif
 
     delete torrent;
     return true;
@@ -2228,16 +2219,10 @@ void Session::findIncompleteFiles(const TorrentInfo &torrentInfo, const QString
     const QStringList originalFileNames = torrentInfo.filePaths();
     const QString completeSavePath = savePath;
     const QString incompleteSavePath = (isTempPathEnabled() ? torrentTempPath(torrentInfo) : QString {});
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(m_fileSearcher, [=]()
     {
         m_fileSearcher->search(searchId, originalFileNames, completeSavePath, incompleteSavePath);
     });
-#else
-    QMetaObject::invokeMethod(m_fileSearcher, "search"
-                              , Q_ARG(BitTorrent::TorrentID, searchId), Q_ARG(QStringList, originalFileNames)
-                              , Q_ARG(QString, completeSavePath), Q_ARG(QString, incompleteSavePath));
-#endif
 }
 
 // Add a torrent to libtorrent session in hidden mode
@@ -2387,24 +2372,15 @@ void Session::saveTorrentsQueue() const
         data += (torrentID.toLatin1() + '\n');
 
     const QString filename = QLatin1String {"queue"};
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(m_resumeDataSavingManager
         , [this, data, filename]() { m_resumeDataSavingManager->save(filename, data); });
-#else
-    QMetaObject::invokeMethod(m_resumeDataSavingManager, "save"
-                              , Q_ARG(QString, filename), Q_ARG(QByteArray, data));
-#endif
 }
 
 void Session::removeTorrentsQueue() const
 {
     const QString filename = QLatin1String {"queue"};
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(m_resumeDataSavingManager
         , [this, filename]() { m_resumeDataSavingManager->remove(filename); });
-#else
-    QMetaObject::invokeMethod(m_resumeDataSavingManager, "remove", Q_ARG(QString, filename));
-#endif
 }
 
 void Session::setDefaultSavePath(QString path)
@@ -3952,14 +3928,9 @@ void Session::handleTorrentResumeDataReady(TorrentImpl *const torrent, const std
     // Separated thread is used for the blocking IO which results in slow processing of many torrents.
     // Copying lt::entry objects around isn't cheap.
 
-    const QString filename = QString::fromLatin1("%1.fastresume").arg(torrent->id().toString());
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+    const QString filename = QString::fromLatin1("%1.fastresume").arg(torrent->id());
     QMetaObject::invokeMethod(m_resumeDataSavingManager
         , [this, filename, data]() { m_resumeDataSavingManager->save(filename, data); });
-#else
-    QMetaObject::invokeMethod(m_resumeDataSavingManager, "save"
-        , Q_ARG(QString, filename), Q_ARG(std::shared_ptr<lt::entry>, data));
-#endif
 }
 
 void Session::handleTorrentTrackerReply(TorrentImpl *const torrent, const QString &trackerUrl)
@@ -4118,15 +4089,9 @@ void Session::configureDeferred()
 {
     if (m_deferredConfigureScheduled)
         return;
-    m_deferredConfigureScheduled = true;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
-    QMetaObject::invokeMethod(this
-        , qOverload<>(&Session::configure)
-        , Qt::QueuedConnection);
-#else
-    QMetaObject::invokeMethod(this, "configure", Qt::QueuedConnection);
-#endif
+    m_deferredConfigureScheduled = true;
+    QMetaObject::invokeMethod(this, qOverload<>(&Session::configure), Qt::QueuedConnection);
 }
 
 // Enable IP Filtering
diff --git a/src/base/bittorrent/session.h b/src/base/bittorrent/session.h
index e7f6ccb52..c6e02a862 100644
--- a/src/base/bittorrent/session.h
+++ b/src/base/bittorrent/session.h
@@ -790,8 +790,3 @@ namespace BitTorrent
         static Session *m_instance;
     };
 }
-
-#if (QT_VERSION < QT_VERSION_CHECK(5, 10, 0))
-Q_DECLARE_METATYPE(std::shared_ptr<lt::entry>)
-const int sharedPtrLtEntryTypeID = qRegisterMetaType<std::shared_ptr<lt::entry>>();
-#endif
diff --git a/src/base/bittorrent/torrentinfo.cpp b/src/base/bittorrent/torrentinfo.cpp
index 7630c24bf..1732320d6 100644
--- a/src/base/bittorrent/torrentinfo.cpp
+++ b/src/base/bittorrent/torrentinfo.cpp
@@ -492,11 +492,7 @@ void TorrentInfo::addRootFolder()
     const QString extension = Utils::Fs::fileExtension(originalName);
     const QString rootFolder = extension.isEmpty()
             ? originalName
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
             : originalName.chopped(extension.size() + 1);
-#else
-            : originalName.left(originalName.size() - (extension.size() + 1));
-#endif
     const std::string rootPrefix = Utils::Fs::toNativePath(rootFolder + QLatin1Char {'/'}).toStdString();
     lt::file_storage files = m_nativeInfo->files();
     files.set_name(rootFolder.toStdString());
diff --git a/src/base/preferences.cpp b/src/base/preferences.cpp
index dd70c52a4..0d9d75e71 100644
--- a/src/base/preferences.cpp
+++ b/src/base/preferences.cpp
@@ -863,7 +863,7 @@ void Preferences::setAutoRunProgram(const QString &program)
     setValue("AutoRun/program", program);
 }
 
-#if defined(Q_OS_WIN) && (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+#if defined(Q_OS_WIN)
 bool Preferences::isAutoRunConsoleEnabled() const
 {
     return value("AutoRun/ConsoleEnabled", false).toBool();
diff --git a/src/base/preferences.h b/src/base/preferences.h
index 1235474ff..e7df00861 100644
--- a/src/base/preferences.h
+++ b/src/base/preferences.h
@@ -248,7 +248,7 @@ public:
     void setAutoRunEnabled(bool enabled);
     QString getAutoRunProgram() const;
     void setAutoRunProgram(const QString &program);
-#if defined(Q_OS_WIN) && (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+#if defined(Q_OS_WIN)
     bool isAutoRunConsoleEnabled() const;
     void setAutoRunConsoleEnabled(bool enabled);
 #endif
diff --git a/src/base/rss/rss_parser.cpp b/src/base/rss/rss_parser.cpp
index db710f9e5..66dc5376d 100644
--- a/src/base/rss/rss_parser.cpp
+++ b/src/base/rss/rss_parser.cpp
@@ -547,13 +547,8 @@ Parser::Parser(const QString lastBuildDate)
 
 void Parser::parse(const QByteArray &feedData)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(this, [this, feedData]() { parse_impl(feedData); }
                               , Qt::QueuedConnection);
-#else
-    QMetaObject::invokeMethod(this, "parse_impl", Qt::QueuedConnection
-                              , Q_ARG(QByteArray, feedData));
-#endif
 }
 
 // read and create items from a rss document
diff --git a/src/base/utils/fs.cpp b/src/base/utils/fs.cpp
index 2724cf510..1be3f98a2 100644
--- a/src/base/utils/fs.cpp
+++ b/src/base/utils/fs.cpp
@@ -78,11 +78,7 @@ QString Utils::Fs::toUniformPath(const QString &path)
 QString Utils::Fs::fileExtension(const QString &filename)
 {
     const QString name = filename.endsWith(QB_EXT)
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
         ? filename.chopped(QB_EXT.length())
-#else
-        ? filename.left(filename.length() - QB_EXT.length())
-#endif
         : filename;
     return QMimeDatabase().suffixForFileName(name);
 }
diff --git a/src/gui/autoexpandabledialog.cpp b/src/gui/autoexpandabledialog.cpp
index b59a0c1b1..af54db1fb 100644
--- a/src/gui/autoexpandabledialog.cpp
+++ b/src/gui/autoexpandabledialog.cpp
@@ -79,31 +79,19 @@ void AutoExpandableDialog::showEvent(QShowEvent *e)
 
     // Show dialog and resize textbox to fit the text
     // NOTE: For unknown reason QFontMetrics gets more accurate when called from showEvent.
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
     int wd = m_ui->textEdit->fontMetrics().horizontalAdvance(m_ui->textEdit->text()) + 4;
-#else
-    int wd = m_ui->textEdit->fontMetrics().width(m_ui->textEdit->text()) + 4;
-#endif
 
     if (!windowTitle().isEmpty())
     {
         // not really the font metrics in window title, so we enlarge it a bit,
         // including the small icon and close button width
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
         int w = fontMetrics().horizontalAdvance(windowTitle()) * 1.8;
-#else
-        int w = fontMetrics().width(windowTitle()) * 1.8;
-#endif
         wd = std::max(wd, w);
     }
 
     if (!m_ui->textLabel->text().isEmpty())
     {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
         int w = m_ui->textLabel->fontMetrics().horizontalAdvance(m_ui->textLabel->text());
-#else
-        int w = m_ui->textLabel->fontMetrics().width(m_ui->textLabel->text());
-#endif
         wd = std::max(wd, w);
     }
 
diff --git a/src/gui/log/loglistview.cpp b/src/gui/log/loglistview.cpp
index 9ea6cf693..881a31fc5 100644
--- a/src/gui/log/loglistview.cpp
+++ b/src/gui/log/loglistview.cpp
@@ -46,11 +46,7 @@ namespace
 
     int horizontalAdvance(const QFontMetrics &fontMetrics, const QString &text)
     {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
         return fontMetrics.horizontalAdvance(text);
-#else
-        return fontMetrics.width(text);
-#endif
     }
 
     QString logText(const QModelIndex &index)
diff --git a/src/gui/optionsdialog.cpp b/src/gui/optionsdialog.cpp
index 064e1daa3..4de02aa9f 100644
--- a/src/gui/optionsdialog.cpp
+++ b/src/gui/optionsdialog.cpp
@@ -753,7 +753,7 @@ void OptionsDialog::saveOptions()
     pref->setMailNotificationSMTPPassword(m_ui->mailNotifPassword->text());
     pref->setAutoRunEnabled(m_ui->autoRunBox->isChecked());
     pref->setAutoRunProgram(m_ui->lineEditAutoRun->text().trimmed());
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)) && defined(Q_OS_WIN)
+#if defined(Q_OS_WIN)
     pref->setAutoRunConsoleEnabled(m_ui->autoRunConsole->isChecked());
 #endif
     pref->setActionOnDblClOnTorrentDl(getActionOnDblClOnTorrentDl());
@@ -1043,7 +1043,7 @@ void OptionsDialog::loadOptions()
 
     m_ui->autoRunBox->setChecked(pref->isAutoRunEnabled());
     m_ui->lineEditAutoRun->setText(pref->getAutoRunProgram());
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)) && defined(Q_OS_WIN)
+#if defined(Q_OS_WIN)
     m_ui->autoRunConsole->setChecked(pref->isAutoRunConsoleEnabled());
 #else
     m_ui->autoRunConsole->hide();
diff --git a/src/gui/properties/speedplotview.cpp b/src/gui/properties/speedplotview.cpp
index d0ab84d19..f1946940d 100644
--- a/src/gui/properties/speedplotview.cpp
+++ b/src/gui/properties/speedplotview.cpp
@@ -304,13 +304,10 @@ void SpeedPlotView::paintEvent(QPaintEvent *)
 
     int yAxisWidth = 0;
     for (const QString &label : speedLabels)
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
+    {
         if (fontMetrics.horizontalAdvance(label) > yAxisWidth)
             yAxisWidth = fontMetrics.horizontalAdvance(label);
-#else
-        if (fontMetrics.width(label) > yAxisWidth)
-            yAxisWidth = fontMetrics.width(label);
-#endif
+    }
 
     int i = 0;
     for (const QString &label : speedLabels)
@@ -391,13 +388,8 @@ void SpeedPlotView::paintEvent(QPaintEvent *)
         if (!property.enable)
             continue;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
         if (fontMetrics.horizontalAdvance(property.name) > legendWidth)
             legendWidth = fontMetrics.horizontalAdvance(property.name);
-#else
-        if (fontMetrics.width(property.name) > legendWidth)
-            legendWidth = fontMetrics.width(property.name);
-#endif
         legendHeight += 1.5 * fontMetrics.height();
     }
 
@@ -412,11 +404,7 @@ void SpeedPlotView::paintEvent(QPaintEvent *)
         if (!property.enable)
             continue;
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
         int nameSize = fontMetrics.horizontalAdvance(property.name);
-#else
-        int nameSize = fontMetrics.width(property.name);
-#endif
         double indent = 1.5 * (i++) * fontMetrics.height();
 
         painter.setPen(property.pen);
diff --git a/src/webui/api/synccontroller.cpp b/src/webui/api/synccontroller.cpp
index 57e71cc70..7f7798abe 100644
--- a/src/webui/api/synccontroller.cpp
+++ b/src/webui/api/synccontroller.cpp
@@ -611,9 +611,5 @@ void SyncController::freeDiskSpaceSizeUpdated(qint64 freeSpaceSize)
 
 void SyncController::invokeChecker() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(m_freeDiskSpaceChecker, &FreeDiskSpaceChecker::check, Qt::QueuedConnection);
-#else
-    QMetaObject::invokeMethod(m_freeDiskSpaceChecker, "check", Qt::QueuedConnection);
-#endif
 }