diff --git a/.appveyor.yml b/.appveyor.yml
index 075bb7f5d..744bb9eb7 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -43,7 +43,7 @@ install:
 before_build:
   # setup env
   - CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat"
-  - SET PATH=%PATH%;c:\qbt\qt5_64\bin;%CACHE_DIR%\jom;
+  - SET PATH=%PATH%;C:\Qt\5.15.2\msvc2019_64\bin;%CACHE_DIR%\jom
   # setup project
   - COPY /Y "%CACHE_DIR%\conf.pri" "%REPO_DIR%"
   # workarounds
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 60574f109..b600d5052 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -42,12 +42,12 @@ jobs:
           libboost-dev libboost-chrono-dev libboost-random-dev libboost-system-dev
       # sudo apt install libqt5svg5-dev qtbase5-dev qttools5-dev # the Qt version in the standard repositories is too old...
 
-    # this will be installed under /opt/qt514. CMake will still find it automatically without additional hints
-    # to speed up the process, only the required components are installed rather than the full qt514-meta-full metapackage
-    - name: install Qt 5.14.2 from an external PPA
+    # this will be installed under /opt/qt515. CMake will still find it automatically without additional hints
+    # to speed up the process, only the required components are installed rather than the full qt515-meta-full metapackage
+    - name: install Qt 5.15.2 from an external PPA
       run: |
-        sudo add-apt-repository ppa:beineri/opt-qt-5.14.2-focal
-        sudo apt install qt514base qt514svg qt514tools
+        sudo add-apt-repository ppa:beineri/opt-qt-5.15.2-focal
+        sudo apt install qt515base qt515svg qt515tools
 
     - name: install libtorrent from source
       run: |
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f390c33f4..aa9fdefcf 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 5.14)
+set(minQtVersion 5.15.2)
 set(minOpenSSLVersion 1.1.1)
 set(minLibtorrentVersion 1.2.14)
 set(minZlibVersion 1.2.11)
diff --git a/INSTALL b/INSTALL
index 6c6b7a3c1..79639b390 100644
--- a/INSTALL
+++ b/INSTALL
@@ -11,7 +11,7 @@ qBittorrent - A BitTorrent client in C++ / Qt
 
   - OpenSSL >= 1.1.1
 
-  - Qt >= 5.14
+  - Qt >= 5.15.2
 
   - zlib >= 1.2.11
 
diff --git a/cmake/Modules/MacroQbtCommonConfig.cmake b/cmake/Modules/MacroQbtCommonConfig.cmake
index ba442233f..391395bda 100644
--- a/cmake/Modules/MacroQbtCommonConfig.cmake
+++ b/cmake/Modules/MacroQbtCommonConfig.cmake
@@ -17,7 +17,7 @@ macro(qbt_common_config)
     )
 
     target_compile_definitions(qbt_common_cfg INTERFACE
-        QT_DISABLE_DEPRECATED_BEFORE=0x050e00
+        QT_DISABLE_DEPRECATED_BEFORE=0x050f02
         QT_NO_CAST_TO_ASCII
         QT_NO_CAST_FROM_BYTEARRAY
         QT_USE_QSTRINGBUILDER
diff --git a/configure b/configure
index 2d4980fcd..91fa2a986 100755
--- a/configure
+++ b/configure
@@ -1450,7 +1450,7 @@ 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 >= 5.14, overriding pkg-config
+  QT_QMAKE    value of host_bins for Qt5Core >= 5.15.2, overriding pkg-config
   Qt5Svg_CFLAGS
               C compiler flags for Qt5Svg, overriding pkg-config
   Qt5Svg_LIBS linker flags for Qt5Svg, overriding pkg-config
@@ -5456,8 +5456,8 @@ 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 >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
@@ -5466,12 +5466,12 @@ if test -n "$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 >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.15.2") 2>&5
   ac_status=$?
   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 >= 5.14" 2>/dev/null`
+  pkg_cv_QT_QMAKE=`$PKG_CONFIG --variable="host_bins" "Qt5Core >= 5.15.2" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5501,8 +5501,8 @@ fi
 
 fi
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5 qmake >= 5.14" >&5
-printf %s "checking for Qt5 qmake >= 5.14... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5 qmake >= 5.15.2" >&5
+printf %s "checking for Qt5 qmake >= 5.15.2... " >&6; }
 if test "x$QT_QMAKE" != "x"
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $QT_QMAKE" >&5
@@ -5529,12 +5529,12 @@ if test -n "$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 >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
-  pkg_cv_Qt5Svg_CFLAGS=`$PKG_CONFIG --cflags "Qt5Svg >= 5.14" 2>/dev/null`
+  pkg_cv_Qt5Svg_CFLAGS=`$PKG_CONFIG --cflags "Qt5Svg >= 5.15.2" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5546,12 +5546,12 @@ 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-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Svg >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5Svg >= 5.15.2") 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 >= 5.14" 2>/dev/null`
+  pkg_cv_Qt5Svg_LIBS=`$PKG_CONFIG --libs "Qt5Svg >= 5.15.2" 2>/dev/null`
 		      test "x$?" != "x0" && pkg_failed=yes
 else
   pkg_failed=yes
@@ -5572,14 +5572,14 @@ 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 >= 5.14" 2>&1`
+	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "Qt5Svg >= 5.15.2" 2>&1`
         else
-	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "Qt5Svg >= 5.14" 2>&1`
+	        Qt5Svg_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "Qt5Svg >= 5.15.2" 2>&1`
         fi
 	# Put the nasty error message in config.log where it belongs
 	echo "$Qt5Svg_PKG_ERRORS" >&5
 
-	as_fn_error $? "Package requirements (Qt5Svg >= 5.14) were not met:
+	as_fn_error $? "Package requirements (Qt5Svg >= 5.15.2) were not met:
 
 $Qt5Svg_PKG_ERRORS
 
@@ -5619,11 +5619,11 @@ 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-$LINENO}: checking for Qt5DBus >= 5.14" >&5
-printf %s "checking for Qt5DBus >= 5.14... " >&6; }
+               { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Qt5DBus >= 5.15.2" >&5
+printf %s "checking for Qt5DBus >= 5.15.2... " >&6; }
        if test -n "$PKG_CONFIG" && \
-    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5DBus >= 5.14\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "Qt5DBus >= 5.14") 2>&5
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5DBus >= 5.15.2\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "Qt5DBus >= 5.15.2") 2>&5
   ac_status=$?
   printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; then
diff --git a/configure.ac b/configure.ac
index 8f2064243..5c63b1df0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,4 @@
+
 AC_INIT([qbittorrent], [v4.4.0alpha], [bugs.qbittorrent.org], [], [https://www.qbittorrent.org/])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
@@ -141,7 +142,7 @@ AS_IF([test "x$QT_QMAKE" = "x"],
       [AC_MSG_ERROR([Could not find qmake])
       ])
 AS_IF([test "x$enable_gui" = "xyes"],
-      [PKG_CHECK_MODULES(Qt5Svg, [Qt5Svg >= 5.14])
+      [PKG_CHECK_MODULES(Qt5Svg, [Qt5Svg >= 5.15.2])
       ])
 AC_MSG_CHECKING([whether QtDBus should be enabled])
 AS_CASE(["x$enable_qt_dbus"],
diff --git a/m4/qbittorrent.m4 b/m4/qbittorrent.m4
index 56bdadaaa..e67f93544 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 >= 5.14],
+[PKG_CHECK_EXISTS([Qt5Core >= 5.15.2],
                  [PKG_CHECK_VAR(QT_QMAKE,
-                                [Qt5Core >= 5.14],
+                                [Qt5Core >= 5.15.2],
                                 [host_bins])
                  ])
 
@@ -18,7 +18,7 @@ AS_IF([test -f "$QT_QMAKE/qmake"],
                              [QT_QMAKE=""])
               ])
 
-AC_MSG_CHECKING([for Qt5 qmake >= 5.14])
+AC_MSG_CHECKING([for Qt5 qmake >= 5.15.2])
 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 >= 5.14])
-       PKG_CHECK_EXISTS([Qt5DBus >= 5.14],
+       [AC_MSG_CHECKING([for Qt5DBus >= 5.15.2])
+       PKG_CHECK_EXISTS([Qt5DBus >= 5.15.2],
                         [AC_MSG_RESULT([found])
                          HAVE_QTDBUS=[true]],
                         [AC_MSG_RESULT([not found])
diff --git a/src/app/application.cpp b/src/app/application.cpp
index d89a51719..e87485751 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -435,16 +435,12 @@ void Application::runExternalProgram(const BitTorrent::Torrent *torrent) const
     // enable command injection via torrent name and other arguments
     // (especially when some automated download mechanism has been setup).
     // See: https://github.com/qbittorrent/qBittorrent/issues/10925
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     QStringList args = QProcess::splitCommand(program);
     if (args.isEmpty())
         return;
 
     const QString command = args.takeFirst();
     QProcess::startDetached(command, args);
-#else
-    QProcess::startDetached(program);
-#endif
 #endif
 }
 
@@ -565,7 +561,7 @@ void Application::processParams(const QStringList &params)
 
         if (param.startsWith(QLatin1String("@addPaused=")))
         {
-            torrentParams.addPaused = (param.midRef(11).toInt() != 0);
+            torrentParams.addPaused = (QStringView(param).mid(11).toInt() != 0);
             continue;
         }
 
@@ -595,7 +591,7 @@ void Application::processParams(const QStringList &params)
 
         if (param.startsWith(QLatin1String("@skipDialog=")))
         {
-            skipTorrentDialog = (param.midRef(12).toInt() != 0);
+            skipTorrentDialog = (QStringView(param).mid(12).toInt() != 0);
             continue;
         }
 
diff --git a/src/base/bittorrent/peeraddress.cpp b/src/base/bittorrent/peeraddress.cpp
index 79ba90ee9..ebe73d637 100644
--- a/src/base/bittorrent/peeraddress.cpp
+++ b/src/base/bittorrent/peeraddress.cpp
@@ -32,18 +32,18 @@
 
 using namespace BitTorrent;
 
-PeerAddress PeerAddress::parse(const QString &address)
+PeerAddress PeerAddress::parse(const QStringView address)
 {
-    QVector<QStringRef> ipPort;
+    QList<QStringView> ipPort;
 
-    if (address.startsWith('[') && address.contains("]:"))
+    if (address.startsWith(u'[') && address.contains(QLatin1String("]:")))
     {  // IPv6
-        ipPort = address.splitRef("]:");
+        ipPort = address.split(QString::fromLatin1("]:"));
         ipPort[0] = ipPort[0].mid(1);  // chop '['
     }
-    else if (address.contains(':'))
+    else if (address.contains(u':'))
     {  // IPv4
-        ipPort = address.splitRef(':');
+        ipPort = address.split(u':');
     }
     else
     {
diff --git a/src/base/bittorrent/peeraddress.h b/src/base/bittorrent/peeraddress.h
index 142cf048f..3d7e5b391 100644
--- a/src/base/bittorrent/peeraddress.h
+++ b/src/base/bittorrent/peeraddress.h
@@ -39,7 +39,7 @@ namespace BitTorrent
         QHostAddress ip;
         ushort port = 0;
 
-        static PeerAddress parse(const QString &address);
+        static PeerAddress parse(QStringView address);
         QString toString() const;
     };
 
diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index f2a58f6db..aebb53d54 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -1590,7 +1590,7 @@ void Session::populateAdditionalTrackers()
     m_additionalTrackerList.clear();
 
     const QString trackers = additionalTrackers();
-    for (QStringRef tracker : asConst(trackers.splitRef('\n')))
+    for (QStringView tracker : asConst(QStringView(trackers).split(u'\n')))
     {
         tracker = tracker.trimmed();
         if (!tracker.isEmpty())
diff --git a/src/base/bittorrent/torrentimpl.cpp b/src/base/bittorrent/torrentimpl.cpp
index ed6d5ba9d..16670688b 100644
--- a/src/base/bittorrent/torrentimpl.cpp
+++ b/src/base/bittorrent/torrentimpl.cpp
@@ -1868,9 +1868,9 @@ void TorrentImpl::handleFileRenamedAlert(const lt::file_renamed_alert *p)
     if (m_oldPath[p->index].isEmpty())
         m_oldPath.remove(p->index);
 
-    QVector<QStringRef> oldPathParts = oldFilePath.splitRef('/', Qt::SkipEmptyParts);
+    QList<QStringView> oldPathParts = QStringView(oldFilePath).split('/', Qt::SkipEmptyParts);
     oldPathParts.removeLast();  // drop file name part
-    QVector<QStringRef> newPathParts = newFilePath.splitRef('/', Qt::SkipEmptyParts);
+    QList<QStringView> newPathParts = QStringView(newFilePath).split('/', Qt::SkipEmptyParts);
     newPathParts.removeLast();  // drop file name part
 
 #if defined(Q_OS_WIN)
@@ -1889,7 +1889,7 @@ void TorrentImpl::handleFileRenamedAlert(const lt::file_renamed_alert *p)
 
     for (int i = (oldPathParts.size() - 1); i >= pathIdx; --i)
     {
-        QDir().rmdir(savePath() + Utils::String::join(oldPathParts, QLatin1String("/")));
+        QDir().rmdir(savePath() + Utils::String::join(oldPathParts, QString::fromLatin1("/")));
         oldPathParts.removeLast();
     }
 
diff --git a/src/base/bittorrent/torrentinfo.cpp b/src/base/bittorrent/torrentinfo.cpp
index 00e18de6c..e1805026f 100644
--- a/src/base/bittorrent/torrentinfo.cpp
+++ b/src/base/bittorrent/torrentinfo.cpp
@@ -61,7 +61,7 @@ namespace
         {
             if (QDir::isAbsolutePath(filePath)) continue;
 
-            const auto filePathElements = filePath.splitRef('/');
+            const auto filePathElements = QStringView(filePath).split(u'/');
             // if at least one file has no root folder, no common root folder exists
             if (filePathElements.count() <= 1) return {};
 
diff --git a/src/base/http/connection.cpp b/src/base/http/connection.cpp
index a27b68a1f..0dc5a8b98 100644
--- a/src/base/http/connection.cpp
+++ b/src/base/http/connection.cpp
@@ -137,9 +137,9 @@ bool Connection::acceptsGzipEncoding(QString codings)
 {
     // [rfc7231] 5.3.4. Accept-Encoding
 
-    const auto isCodingAvailable = [](const QVector<QStringRef> &list, const QString &encoding) -> bool
+    const auto isCodingAvailable = [](const QList<QStringView> &list, const QStringView encoding) -> bool
     {
-        for (const QStringRef &str : list)
+        for (const QStringView &str : list)
         {
             if (!str.startsWith(encoding))
                 continue;
@@ -149,7 +149,7 @@ bool Connection::acceptsGzipEncoding(QString codings)
                 return true;
 
             // [rfc7231] 5.3.1. Quality Values
-            const QStringRef substr = str.mid(encoding.size() + 3);  // ex. skip over "gzip;q="
+            const QStringView substr = str.mid(encoding.size() + 3);  // ex. skip over "gzip;q="
 
             bool ok = false;
             const double qvalue = substr.toDouble(&ok);
@@ -161,15 +161,15 @@ bool Connection::acceptsGzipEncoding(QString codings)
         return false;
     };
 
-    const QVector<QStringRef> list = codings.remove(' ').remove('\t').splitRef(',', Qt::SkipEmptyParts);
+    const QList<QStringView> list = QStringView(codings.remove(' ').remove('\t')).split(u',', Qt::SkipEmptyParts);
     if (list.isEmpty())
         return false;
 
-    const bool canGzip = isCodingAvailable(list, QLatin1String("gzip"));
+    const bool canGzip = isCodingAvailable(list, QString::fromLatin1("gzip"));
     if (canGzip)
         return true;
 
-    const bool canAny = isCodingAvailable(list, QLatin1String("*"));
+    const bool canAny = isCodingAvailable(list, QString::fromLatin1("*"));
     if (canAny)
         return true;
 
diff --git a/src/base/http/requestparser.cpp b/src/base/http/requestparser.cpp
index 284783c3f..7f8af9a66 100644
--- a/src/base/http/requestparser.cpp
+++ b/src/base/http/requestparser.cpp
@@ -57,7 +57,7 @@ namespace
         return in;
     }
 
-    bool parseHeaderLine(const QString &line, HeaderMap &out)
+    bool parseHeaderLine(const QStringView line, HeaderMap &out)
     {
         // [rfc7230] 3.2. Header Fields
         const int i = line.indexOf(':');
@@ -67,8 +67,8 @@ namespace
             return false;
         }
 
-        const QString name = line.leftRef(i).trimmed().toString().toLower();
-        const QString value = line.midRef(i + 1).trimmed().toString();
+        const QString name = line.left(i).trimmed().toString().toLower();
+        const QString value = line.mid(i + 1).trimmed().toString();
         out[name] = value;
 
         return true;
@@ -145,10 +145,10 @@ RequestParser::ParseResult RequestParser::doParse(const QByteArray &data)
     return {ParseStatus::BadRequest, Request(), 0};  // TODO: SHOULD respond "501 Not Implemented"
 }
 
-bool RequestParser::parseStartLines(const QString &data)
+bool RequestParser::parseStartLines(const QStringView data)
 {
     // we don't handle malformed request which uses `LF` for newline
-    const QVector<QStringRef> lines = data.splitRef(CRLF, Qt::SkipEmptyParts);
+    const QList<QStringView> lines = data.split(QString::fromLatin1(CRLF), Qt::SkipEmptyParts);
 
     // [rfc7230] 3.2.2. Field Order
     QStringList requestLines;
@@ -267,7 +267,7 @@ bool RequestParser::parsePostMessage(const QByteArray &data)
             return false;
         }
 
-        const QByteArray delimiter = Utils::String::unquote(contentType.midRef(idx + boundaryFieldName.size())).toLatin1();
+        const QByteArray delimiter = Utils::String::unquote(QStringView(contentType).mid(idx + boundaryFieldName.size())).toLatin1();
         if (delimiter.isEmpty())
         {
             qWarning() << Q_FUNC_INFO << "boundary delimiter field empty!";
@@ -311,13 +311,13 @@ bool RequestParser::parseFormData(const QByteArray &data)
     const QByteArray payload = viewWithoutEndingWith(list[1], CRLF);
 
     HeaderMap headersMap;
-    const QVector<QStringRef> headerLines = headers.splitRef(CRLF, Qt::SkipEmptyParts);
+    const QList<QStringView> headerLines = QStringView(headers).split(QString::fromLatin1(CRLF), Qt::SkipEmptyParts);
     for (const auto &line : headerLines)
     {
-        if (line.trimmed().startsWith(HEADER_CONTENT_DISPOSITION, Qt::CaseInsensitive))
+        if (line.trimmed().startsWith(QString::fromLatin1(HEADER_CONTENT_DISPOSITION), Qt::CaseInsensitive))
         {
             // extract out filename & name
-            const QVector<QStringRef> directives = line.split(';', Qt::SkipEmptyParts);
+            const QList<QStringView> directives = line.split(u';', Qt::SkipEmptyParts);
 
             for (const auto &directive : directives)
             {
diff --git a/src/base/http/requestparser.h b/src/base/http/requestparser.h
index cf510165e..b9eb7cdfa 100644
--- a/src/base/http/requestparser.h
+++ b/src/base/http/requestparser.h
@@ -60,7 +60,7 @@ namespace Http
         RequestParser();
 
         ParseResult doParse(const QByteArray &data);
-        bool parseStartLines(const QString &data);
+        bool parseStartLines(QStringView data);
         bool parseRequestLine(const QString &line);
 
         bool parsePostMessage(const QByteArray &data);
diff --git a/src/base/net/smtp.cpp b/src/base/net/smtp.cpp
index df5f157f0..0c4ed4e69 100644
--- a/src/base/net/smtp.cpp
+++ b/src/base/net/smtp.cpp
@@ -122,12 +122,7 @@ Smtp::Smtp(QObject *parent)
 
     connect(m_socket, &QIODevice::readyRead, this, &Smtp::readyRead);
     connect(m_socket, &QAbstractSocket::disconnected, this, &QObject::deleteLater);
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     connect(m_socket, &QAbstractSocket::errorOccurred, this, &Smtp::error);
-#else
-    connect(m_socket, qOverload<QAbstractSocket::SocketError>(&QAbstractSocket::error)
-            , this, &Smtp::error);
-#endif
 
     // Test hmacMD5 function (http://www.faqs.org/rfcs/rfc2202.html)
     Q_ASSERT(hmacMD5("Jefe", "what do ya want for nothing?").toHex()
diff --git a/src/base/rss/rss_autodownloadrule.cpp b/src/base/rss/rss_autodownloadrule.cpp
index 3c701ba91..ecc6b08fd 100644
--- a/src/base/rss/rss_autodownloadrule.cpp
+++ b/src/base/rss/rss_autodownloadrule.cpp
@@ -325,7 +325,7 @@ bool AutoDownloadRule::matchesEpisodeFilterExpression(const QString &articleTitl
 
                 if (episode.endsWith('-'))
                 { // Infinite range
-                    const int episodeOurs {episode.leftRef(episode.size() - 1).toInt()};
+                    const int episodeOurs {QStringView(episode).left(episode.size() - 1).toInt()};
                     if (((seasonTheirs == seasonOurs) && (episodeTheirs >= episodeOurs)) || (seasonTheirs > seasonOurs))
                         return true;
                 }
diff --git a/src/base/search/searchdownloadhandler.cpp b/src/base/search/searchdownloadhandler.cpp
index 8fd823c0d..2d781ff7a 100644
--- a/src/base/search/searchdownloadhandler.cpp
+++ b/src/base/search/searchdownloadhandler.cpp
@@ -59,7 +59,7 @@ void SearchDownloadHandler::downloadProcessFinished(int exitcode)
     if ((exitcode == 0) && (m_downloadProcess->exitStatus() == QProcess::NormalExit))
     {
         const QString line = QString::fromUtf8(m_downloadProcess->readAllStandardOutput()).trimmed();
-        const QVector<QStringRef> parts = line.splitRef(' ');
+        const QList<QStringView> parts = QStringView(line).split(u' ');
         if (parts.size() == 2)
             path = parts[0].toString();
     }
diff --git a/src/base/search/searchhandler.cpp b/src/base/search/searchhandler.cpp
index 6438f0cc9..7aec0d84d 100644
--- a/src/base/search/searchhandler.cpp
+++ b/src/base/search/searchhandler.cpp
@@ -163,9 +163,9 @@ void SearchHandler::processFailed()
 // Parse one line of search results list
 // Line is in the following form:
 // file url | file name | file size | nb seeds | nb leechers | Search engine url
-bool SearchHandler::parseSearchResult(const QString &line, SearchResult &searchResult)
+bool SearchHandler::parseSearchResult(const QStringView line, SearchResult &searchResult)
 {
-    const QVector<QStringRef> parts = line.splitRef('|');
+    const QList<QStringView> parts = line.split(u'|');
     const int nbFields = parts.size();
 
     if (nbFields < (NB_PLUGIN_COLUMNS - 1)) return false; // -1 because desc_link is optional
diff --git a/src/base/search/searchhandler.h b/src/base/search/searchhandler.h
index 981dae502..2f42b1bca 100644
--- a/src/base/search/searchhandler.h
+++ b/src/base/search/searchhandler.h
@@ -78,7 +78,7 @@ private:
     void readSearchOutput();
     void processFailed();
     void processFinished(int exitcode);
-    bool parseSearchResult(const QString &line, SearchResult &searchResult);
+    bool parseSearchResult(QStringView line, SearchResult &searchResult);
 
     const QString m_pattern;
     const QString m_category;
diff --git a/src/base/utils/bytearray.h b/src/base/utils/bytearray.h
index 2b49f2082..c3d959b4c 100644
--- a/src/base/utils/bytearray.h
+++ b/src/base/utils/bytearray.h
@@ -28,14 +28,14 @@
 
 #pragma once
 
-#include <QString>
+#include <Qt>
 #include <QtContainerFwd>
 
 class QByteArray;
 
 namespace Utils::ByteArray
 {
-    // Mimic QString::splitRef(sep, behavior)
+    // Mimic QStringView(in).split(sep, behavior)
     QVector<QByteArray> splitToViews(const QByteArray &in, const QByteArray &sep, const Qt::SplitBehavior behavior = Qt::KeepEmptyParts);
 
     // Mimic QByteArray::mid(pos, len) but instead of returning a full-copy,
diff --git a/src/base/utils/compare.cpp b/src/base/utils/compare.cpp
index 343ff01f5..536dd147c 100644
--- a/src/base/utils/compare.cpp
+++ b/src/base/utils/compare.cpp
@@ -60,16 +60,16 @@ int Utils::Compare::naturalCompare(const QString &left, const QString &right, co
         {
             // Both are digits, compare the numbers
 
-            const auto numberView = [](const QString &str, int &pos) -> QStringRef
+            const auto numberView = [](const QStringView str, int &pos) -> QStringView
             {
                 const int start = pos;
                 while ((pos < str.size()) && str[pos].isDigit())
                     ++pos;
-                return str.midRef(start, (pos - start));
+                return str.mid(start, (pos - start));
             };
 
-            const QStringRef numViewL = numberView(left, posL);
-            const QStringRef numViewR = numberView(right, posR);
+            const QStringView numViewL = numberView(left, posL);
+            const QStringView numViewR = numberView(right, posR);
 
             if (numViewL.length() != numViewR.length())
                 return (numViewL.length() - numViewR.length());
diff --git a/src/base/utils/misc.cpp b/src/base/utils/misc.cpp
index e560f9e75..71c334d43 100644
--- a/src/base/utils/misc.cpp
+++ b/src/base/utils/misc.cpp
@@ -498,7 +498,7 @@ QString Utils::Misc::opensslVersionString()
 #else
     static const auto version {QString::fromLatin1(SSLeay_version(SSLEAY_VERSION))};
 #endif
-    return version.splitRef(' ', Qt::SkipEmptyParts)[1].toString();
+    return QStringView(version).split(u' ', Qt::SkipEmptyParts)[1].toString();
 }
 
 QString Utils::Misc::zlibVersionString()
diff --git a/src/base/utils/string.cpp b/src/base/utils/string.cpp
index 46b2c4450..6efc1adb1 100644
--- a/src/base/utils/string.cpp
+++ b/src/base/utils/string.cpp
@@ -43,7 +43,7 @@
 // to send numbers instead of strings with suffixes
 QString Utils::String::fromDouble(const double n, const int precision)
 {
-    /* HACK because QString rounds up. Eg QString::number(0.999*100.0, 'f' ,1) == 99.9
+    /* HACK because QString rounds up. Eg QString::number(0.999*100.0, 'f', 1) == 99.9
     ** but QString::number(0.9999*100.0, 'f' ,1) == 100.0 The problem manifests when
     ** the number has more digits after the decimal than we want AND the digit after
     ** our 'wanted' is >= 5. In this case our last digit gets rounded up. So for each
@@ -99,7 +99,7 @@ std::optional<double> Utils::String::parseDouble(const QString &string)
     return std::nullopt;
 }
 
-QString Utils::String::join(const QVector<QStringRef> &strings, const QString &separator)
+QString Utils::String::join(const QList<QStringView> &strings, const QStringView separator)
 {
     if (strings.empty())
         return {};
diff --git a/src/base/utils/string.h b/src/base/utils/string.h
index e7ff9919b..e4f3c303b 100644
--- a/src/base/utils/string.h
+++ b/src/base/utils/string.h
@@ -37,8 +37,6 @@
 #include <Qt>
 #include <QtContainerFwd>
 
-class QStringRef;
-
 namespace Utils::String
 {
     QString wildcardToRegexPattern(const QString &pattern);
@@ -61,7 +59,7 @@ namespace Utils::String
     std::optional<int> parseInt(const QString &string);
     std::optional<double> parseDouble(const QString &string);
 
-    QString join(const QVector<QStringRef> &strings, const QString &separator);
+    QString join(const QList<QStringView> &strings, QStringView separator);
 
     QString fromDouble(double n, int precision);
 
diff --git a/src/gui/downloadfromurldialog.cpp b/src/gui/downloadfromurldialog.cpp
index e65c7664f..4e617a24e 100644
--- a/src/gui/downloadfromurldialog.cpp
+++ b/src/gui/downloadfromurldialog.cpp
@@ -75,10 +75,10 @@ DownloadFromURLDialog::DownloadFromURLDialog(QWidget *parent)
 
     // Paste clipboard if there is an URL in it
     const QString clipboardText = qApp->clipboard()->text();
-    const QVector<QStringRef> clipboardList = clipboardText.splitRef('\n');
+    const QList<QStringView> clipboardList = QStringView(clipboardText).split(u'\n');
 
     QSet<QString> uniqueURLs;
-    for (QStringRef strRef : clipboardList)
+    for (QStringView strRef : clipboardList)
     {
         strRef = strRef.trimmed();
         if (strRef.isEmpty()) continue;
@@ -107,10 +107,10 @@ DownloadFromURLDialog::~DownloadFromURLDialog()
 void DownloadFromURLDialog::downloadButtonClicked()
 {
     const QString plainText = m_ui->textUrls->toPlainText();
-    const QVector<QStringRef> urls = plainText.splitRef('\n');
+    const QList<QStringView> urls = QStringView(plainText).split(u'\n');
 
     QSet<QString> uniqueURLs;
-    for (QStringRef url : urls)
+    for (QStringView url : urls)
     {
         url = url.trimmed();
         if (url.isEmpty()) continue;
diff --git a/src/gui/fspathedit_p.cpp b/src/gui/fspathedit_p.cpp
index 1cc63c384..f2c8c294a 100644
--- a/src/gui/fspathedit_p.cpp
+++ b/src/gui/fspathedit_p.cpp
@@ -107,30 +107,32 @@ QValidator::State Private::FileSystemPathValidator::validate(QString &input, int
 
     // we test path components from beginning to the one with cursor location in strict mode
     // and the one with cursor and beyond in non-strict mode
-    QVector<QStringRef> components = input.splitRef(QDir::separator(), Qt::KeepEmptyParts);
+    QList<QStringView> components = QStringView(input).split(QDir::separator(), Qt::KeepEmptyParts);
     // find index of the component that contains pos
     int componentWithCursorIndex = 0;
+    int componentWithCursorPosition = 0;
     int pathLength = 0;
 
     // components.size() - 1 because when path ends with QDir::separator(), we will not see the last
     // character in the components array, yet everything past the one before the last delimiter
     // belongs to the last component
-    for (; (componentWithCursorIndex < components.size() - 1) && (pathLength < pos); ++componentWithCursorIndex)
+    for (; (componentWithCursorIndex < (components.size() - 1)) && (pathLength < pos); ++componentWithCursorIndex)
     {
-        pathLength = components[componentWithCursorIndex].position() + components[componentWithCursorIndex].size();
+        pathLength = componentWithCursorPosition + components[componentWithCursorIndex].size();
+        componentWithCursorPosition += components[componentWithCursorIndex].size() + 1;
     }
 
     Q_ASSERT(componentWithCursorIndex < components.size());
 
     m_lastValidationState = QValidator::Acceptable;
     if (componentWithCursorIndex > 0)
-        m_lastValidationState = validate(input, components, m_strictMode, 0, componentWithCursorIndex - 1);
+        m_lastValidationState = validate(components, m_strictMode, 0, componentWithCursorIndex - 1);
     if ((m_lastValidationState == QValidator::Acceptable) && (componentWithCursorIndex < components.size()))
-        m_lastValidationState = validate(input, components, false, componentWithCursorIndex, components.size() - 1);
+        m_lastValidationState = validate(components, false, componentWithCursorIndex, components.size() - 1);
     return m_lastValidationState;
 }
 
-QValidator::State Private::FileSystemPathValidator::validate(const QString &path, const QVector<QStringRef> &pathComponents, bool strict,
+QValidator::State Private::FileSystemPathValidator::validate(const QList<QStringView> &pathComponents, bool strict,
                                                              int firstComponentToTest, int lastComponentToTest) const
 {
     Q_ASSERT(firstComponentToTest >= 0);
@@ -141,12 +143,13 @@ QValidator::State Private::FileSystemPathValidator::validate(const QString &path
     if (pathComponents.empty())
         return strict ? QValidator::Invalid : QValidator::Intermediate;
 
-    for (int i = firstComponentToTest; i < lastComponentToTest; ++i)
+    for (int i = firstComponentToTest; i <= lastComponentToTest; ++i)
     {
-        if (pathComponents[i].isEmpty()) continue;
+        const bool isFinalPath = (i == (pathComponents.size() - 1));
+        const QStringView componentPath = pathComponents[i];
+        if (componentPath.isEmpty()) continue;
 
-        QStringRef componentPath(&path, 0, pathComponents[i].position() + pathComponents[i].size());
-        m_lastTestResult = testPath(componentPath, false);
+        m_lastTestResult = testPath(pathComponents[i], isFinalPath);
         if (m_lastTestResult != TestResult::OK)
         {
             m_lastTestedPath = componentPath.toString();
@@ -154,20 +157,11 @@ QValidator::State Private::FileSystemPathValidator::validate(const QString &path
         }
     }
 
-    const bool finalPath = (lastComponentToTest == (pathComponents.size() - 1));
-    QStringRef componentPath(&path, 0, pathComponents[lastComponentToTest].position()
-                                + pathComponents[lastComponentToTest].size());
-    m_lastTestResult = testPath(componentPath, finalPath);
-    if (m_lastTestResult != TestResult::OK)
-    {
-        m_lastTestedPath = componentPath.toString();
-        return strict ? QValidator::Invalid : QValidator::Intermediate;
-    }
     return QValidator::Acceptable;
 }
 
 Private::FileSystemPathValidator::TestResult
-Private::FileSystemPathValidator::testPath(const QStringRef &path, bool pathIsComplete) const
+Private::FileSystemPathValidator::testPath(const QStringView path, bool pathIsComplete) const
 {
     QFileInfo fi(path.toString());
     if (m_existingOnly && !fi.exists())
diff --git a/src/gui/fspathedit_p.h b/src/gui/fspathedit_p.h
index a99384fa9..8f443b4d2 100644
--- a/src/gui/fspathedit_p.h
+++ b/src/gui/fspathedit_p.h
@@ -39,7 +39,6 @@ class QCompleter;
 class QContextMenuEvent;
 class QFileSystemModel;
 class QKeyEvent;
-class QStringRef;
 
 namespace Private
 {
@@ -82,10 +81,10 @@ namespace Private
         QString lastTestedPath() const;
 
     private:
-        QValidator::State validate(const QString &path, const QVector<QStringRef> &pathComponents, bool strict,
+        QValidator::State validate(const QList<QStringView> &pathComponents, bool strict,
                                    int firstComponentToTest, int lastComponentToTest) const;
 
-        TestResult testPath(const QStringRef &path, bool pathIsComplete) const;
+        TestResult testPath(QStringView path, bool pathIsComplete) const;
 
         bool m_strictMode;
         bool m_existingOnly;
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index 6210f3fb6..15a7ed5b6 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -2184,8 +2184,9 @@ void MainWindow::pythonDownloadFinished(const Net::DownloadResult &result)
     QProcess installer;
     qDebug("Launching Python installer in passive mode...");
 
-    QFile::rename(result.filePath, result.filePath + ".exe");
-    installer.start('"' + Utils::Fs::toNativePath(result.filePath) + ".exe\" /passive");
+    const QString exePath = result.filePath + QLatin1String(".exe");
+    QFile::rename(result.filePath, exePath);
+    installer.start(Utils::Fs::toNativePath(exePath), {"/passive"});
 
     // Wait for setup to complete
     installer.waitForFinished(10 * 60 * 1000);
@@ -2195,7 +2196,7 @@ void MainWindow::pythonDownloadFinished(const Net::DownloadResult &result)
     qDebug("Setup should be complete!");
 
     // Delete temp file
-    Utils::Fs::forceRemove(result.filePath + ".exe");
+    Utils::Fs::forceRemove(exePath);
 
     // Reload search engine
     if (Utils::ForeignApps::pythonInfo().isSupportedVersion())
diff --git a/src/gui/properties/proptabbar.cpp b/src/gui/properties/proptabbar.cpp
index 1f6b53e42..de7079c96 100644
--- a/src/gui/properties/proptabbar.cpp
+++ b/src/gui/properties/proptabbar.cpp
@@ -100,13 +100,8 @@ PropTabBar::PropTabBar(QWidget *parent)
     addWidget(speedButton);
     m_btnGroup->addButton(speedButton, SpeedTab);
     // SIGNAL/SLOT
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     connect(m_btnGroup, &QButtonGroup::idClicked
             , this, &PropTabBar::setCurrentIndex);
-#else
-    connect(m_btnGroup, qOverload<int>(&QButtonGroup::buttonClicked)
-            , this, &PropTabBar::setCurrentIndex);
-#endif
     // Disable buttons focus
     for (QAbstractButton *btn : asConst(m_btnGroup->buttons()))
         btn->setFocusPolicy(Qt::NoFocus);
diff --git a/src/gui/properties/trackersadditiondialog.cpp b/src/gui/properties/trackersadditiondialog.cpp
index f0f904e54..f9f4557b5 100644
--- a/src/gui/properties/trackersadditiondialog.cpp
+++ b/src/gui/properties/trackersadditiondialog.cpp
@@ -59,7 +59,7 @@ QStringList TrackersAdditionDialog::newTrackers() const
     const QString plainText = m_ui->textEditTrackersList->toPlainText();
 
     QStringList cleanTrackers;
-    for (QStringRef url : asConst(plainText.splitRef('\n')))
+    for (QStringView url : asConst(QStringView(plainText).split(u'\n')))
     {
         url = url.trimmed();
         if (!url.isEmpty())
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index a37643de8..71a3374f7 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -504,16 +504,16 @@ void TorrentContentModel::setupModelData(const BitTorrent::TorrentInfo &info)
         const QString path = Utils::Fs::toUniformPath(info.filePath(i));
 
         // Iterate of parts of the path to create necessary folders
-        QVector<QStringRef> pathFolders = path.splitRef('/', Qt::SkipEmptyParts);
+        QList<QStringView> pathFolders = QStringView(path).split(u'/', Qt::SkipEmptyParts);
         pathFolders.removeLast();
 
-        for (const QStringRef &pathPartRef : asConst(pathFolders))
+        for (const QStringView pathPart : asConst(pathFolders))
         {
-            const QString pathPart = pathPartRef.toString();
-            TorrentContentModelFolder *newParent = currentParent->childFolderWithName(pathPart);
+            const QString folderPath = pathPart.toString();
+            TorrentContentModelFolder *newParent = currentParent->childFolderWithName(folderPath);
             if (!newParent)
             {
-                newParent = new TorrentContentModelFolder(pathPart, currentParent);
+                newParent = new TorrentContentModelFolder(folderPath, currentParent);
                 currentParent->appendChild(newParent);
             }
             currentParent = newParent;
diff --git a/src/gui/torrentoptionsdialog.cpp b/src/gui/torrentoptionsdialog.cpp
index 71326f71c..49ac52cf7 100644
--- a/src/gui/torrentoptionsdialog.cpp
+++ b/src/gui/torrentoptionsdialog.cpp
@@ -263,12 +263,7 @@ TorrentOptionsDialog::TorrentOptionsDialog(QWidget *parent, const QVector<BitTor
     connect(m_ui->checkMaxRatio, &QCheckBox::toggled, m_ui->spinRatioLimit, &QDoubleSpinBox::setEnabled);
     connect(m_ui->checkMaxTime, &QCheckBox::toggled, m_ui->spinTimeLimit, &QSpinBox::setEnabled);
 
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
     connect(m_ui->buttonGroup, &QButtonGroup::idClicked, this, &TorrentOptionsDialog::handleRatioTypeChanged);
-#else
-    connect(m_ui->buttonGroup, qOverload<int>(&QButtonGroup::buttonClicked)
-            , this, &TorrentOptionsDialog::handleRatioTypeChanged);
-#endif
 
     Utils::Gui::resize(this, m_storeDialogSize);
 }
diff --git a/src/gui/trackerentriesdialog.cpp b/src/gui/trackerentriesdialog.cpp
index 46bb7fe37..a685449a4 100644
--- a/src/gui/trackerentriesdialog.cpp
+++ b/src/gui/trackerentriesdialog.cpp
@@ -81,13 +81,13 @@ void TrackerEntriesDialog::setTrackers(const QVector<BitTorrent::TrackerEntry> &
 QVector<BitTorrent::TrackerEntry> TrackerEntriesDialog::trackers() const
 {
     const QString plainText = m_ui->plainTextEdit->toPlainText();
-    const QVector<QStringRef> lines = plainText.splitRef('\n');
+    const QList<QStringView> lines = QStringView(plainText).split(u'\n');
 
     QVector<BitTorrent::TrackerEntry> entries;
     entries.reserve(lines.size());
 
     int tier = 0;
-    for (QStringRef line : lines)
+    for (QStringView line : lines)
     {
         line = line.trimmed();
 
diff --git a/src/src.pro b/src/src.pro
index 796c39521..8e87c56c9 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -56,7 +56,7 @@ CONFIG(release, debug|release) {
 include(../version.pri)
 
 # Qt defines
-DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x050e00
+DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x050f02
 DEFINES += QT_NO_CAST_TO_ASCII
 DEFINES += QT_NO_CAST_FROM_BYTEARRAY
 DEFINES += QT_USE_QSTRINGBUILDER
diff --git a/src/webui/webapplication.cpp b/src/webui/webapplication.cpp
index d71531ce4..f471da42e 100644
--- a/src/webui/webapplication.cpp
+++ b/src/webui/webapplication.cpp
@@ -72,11 +72,11 @@ const QString PRIVATE_FOLDER {QStringLiteral("/private")};
 
 namespace
 {
-    QStringMap parseCookie(const QString &cookieStr)
+    QStringMap parseCookie(const QStringView cookieStr)
     {
         // [rfc6265] 4.2.1. Syntax
         QStringMap ret;
-        const QVector<QStringRef> cookies = cookieStr.splitRef(';', Qt::SkipEmptyParts);
+        const QList<QStringView> cookies = cookieStr.split(u';', Qt::SkipEmptyParts);
 
         for (const auto &cookie : cookies)
         {
@@ -386,10 +386,10 @@ void WebApplication::configure()
 
     if (pref->isWebUICustomHTTPHeadersEnabled())
     {
-        const QString customHeaders = pref->getWebUICustomHTTPHeaders().trimmed();
-        const QVector<QStringRef> customHeaderLines = customHeaders.splitRef('\n', Qt::SkipEmptyParts);
+        const QString customHeaders = pref->getWebUICustomHTTPHeaders();
+        const QList<QStringView> customHeaderLines = QStringView(customHeaders).trimmed().split(u'\n', Qt::SkipEmptyParts);
 
-        for (const QStringRef &line : customHeaderLines)
+        for (const QStringView line : customHeaderLines)
         {
             const int idx = line.indexOf(':');
             if (idx < 0)