diff --git a/src/app/filelogger.cpp b/src/app/filelogger.cpp
index 743c9bcad..143bc287b 100644
--- a/src/app/filelogger.cpp
+++ b/src/app/filelogger.cpp
@@ -126,7 +126,9 @@ void FileLogger::addLogMessage(const Log::Msg &msg)
     if (!m_logFile.isOpen()) return;
 
     QTextStream stream(&m_logFile);
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
     stream.setCodec("UTF-8");
+#endif
 
     switch (msg.type)
     {
diff --git a/src/app/main.cpp b/src/app/main.cpp
index aceb0c1e4..f3c20339e 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 !defined(DISABLE_GUI)
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0)) && !defined(DISABLE_GUI)
         // this is the default in Qt6
         app->setAttribute(Qt::AA_DisableWindowContextHelpButton);
 #endif
diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index 77b76dd9f..3ee31176f 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -58,7 +58,9 @@
 #include <QFile>
 #include <QHostAddress>
 #include <QNetworkAddressEntry>
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 #include <QNetworkConfigurationManager>
+#endif
 #include <QNetworkInterface>
 #include <QRegularExpression>
 #include <QString>
@@ -95,7 +97,6 @@
 #include "statistics.h"
 #include "torrentimpl.h"
 #include "tracker.h"
-#include "trackerentry.h"
 
 using namespace BitTorrent;
 
@@ -444,7 +445,9 @@ Session::Session(QObject *parent)
     , m_statistics {new Statistics {this}}
     , m_ioThread {new QThread {this}}
     , m_recentErroredTorrentsTimer {new QTimer {this}}
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
     , m_networkManager {new QNetworkConfigurationManager {this}}
+#endif
 {
     if (port() < 0)
         m_port = Utils::Random::rand(1024, 65535);
@@ -485,11 +488,13 @@ Session::Session(QObject *parent)
         , &Net::ProxyConfigurationManager::proxyConfigurationChanged
         , this, &Session::configureDeferred);
 
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
     // Network configuration monitor
     connect(m_networkManager, &QNetworkConfigurationManager::onlineStateChanged, this, &Session::networkOnlineStateChanged);
     connect(m_networkManager, &QNetworkConfigurationManager::configurationAdded, this, &Session::networkConfigurationChange);
     connect(m_networkManager, &QNetworkConfigurationManager::configurationRemoved, this, &Session::networkConfigurationChange);
     connect(m_networkManager, &QNetworkConfigurationManager::configurationChanged, this, &Session::networkConfigurationChange);
+#endif
 
     m_fileSearcher = new FileSearcher;
     m_fileSearcher->moveToThread(m_ioThread);
@@ -2413,6 +2418,7 @@ void Session::setTempPath(QString path)
         torrent->handleTempPathChanged();
 }
 
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 void Session::networkOnlineStateChanged(const bool online)
 {
     LogMsg(tr("System network status changed to %1", "e.g: System network status changed to ONLINE").arg(online ? tr("ONLINE") : tr("OFFLINE")), Log::INFO);
@@ -2433,6 +2439,7 @@ void Session::networkConfigurationChange(const QNetworkConfiguration &cfg)
         configureListeningInterface();
     }
 }
+#endif
 
 QStringList Session::getListeningIPs() const
 {
diff --git a/src/base/bittorrent/session.h b/src/base/bittorrent/session.h
index e6a2bb0b2..aea73f7a9 100644
--- a/src/base/bittorrent/session.h
+++ b/src/base/bittorrent/session.h
@@ -50,10 +50,13 @@
 #include "cachestatus.h"
 #include "sessionstatus.h"
 #include "torrentinfo.h"
+#include "trackerentry.h"
 
 class QFile;
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 class QNetworkConfiguration;
 class QNetworkConfigurationManager;
+#endif
 class QString;
 class QThread;
 class QTimer;
@@ -100,7 +103,6 @@ namespace BitTorrent
     class TorrentImpl;
     class Tracker;
     struct LoadTorrentParams;
-    struct TrackerEntry;
 
     enum class MoveStorageMode;
 
@@ -542,9 +544,11 @@ namespace BitTorrent
         void handleDownloadFinished(const Net::DownloadResult &result);
         void fileSearchFinished(const TorrentID &id, const QString &savePath, const QStringList &fileNames);
 
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
         // Session reconfiguration triggers
         void networkOnlineStateChanged(bool online);
         void networkConfigurationChange(const QNetworkConfiguration &);
+#endif
 
     private:
         struct MoveStorageJob
@@ -783,8 +787,9 @@ namespace BitTorrent
 
         SessionStatus m_status;
         CacheStatus m_cacheStatus;
-
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
         QNetworkConfigurationManager *m_networkManager = nullptr;
+#endif
 
         QList<MoveStorageJob> m_moveStorageQueue;
 
diff --git a/src/base/net/reverseresolution.cpp b/src/base/net/reverseresolution.cpp
index b53ea1989..8349229e3 100644
--- a/src/base/net/reverseresolution.cpp
+++ b/src/base/net/reverseresolution.cpp
@@ -28,7 +28,6 @@
 
 #include "reverseresolution.h"
 
-#include <QHostAddress>
 #include <QHostInfo>
 #include <QString>
 
diff --git a/src/base/net/reverseresolution.h b/src/base/net/reverseresolution.h
index 7e4c4af7a..3e4a5d2d9 100644
--- a/src/base/net/reverseresolution.h
+++ b/src/base/net/reverseresolution.h
@@ -29,9 +29,9 @@
 #pragma once
 
 #include <QCache>
+#include <QHostAddress>
 #include <QObject>
 
-class QHostAddress;
 class QHostInfo;
 class QString;
 
diff --git a/src/base/settingsstorage.cpp b/src/base/settingsstorage.cpp
index d9ac0a337..37eabc625 100644
--- a/src/base/settingsstorage.cpp
+++ b/src/base/settingsstorage.cpp
@@ -224,7 +224,11 @@ void SettingsStorage::removeValue(const QString &key)
 {
     const QString realKey = mapKey(key);
     const QWriteLocker locker(&m_lock);
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    if (m_data.remove(realKey))
+#else
     if (m_data.remove(realKey) > 0)
+#endif
     {
         m_dirty = true;
         m_timer.start();
diff --git a/src/gui/addnewtorrentdialog.cpp b/src/gui/addnewtorrentdialog.cpp
index 6546a845a..e6d66993b 100644
--- a/src/gui/addnewtorrentdialog.cpp
+++ b/src/gui/addnewtorrentdialog.cpp
@@ -549,10 +549,10 @@ void AddNewTorrentDialog::displayContentTreeMenu(const QPoint &)
 
         const QModelIndexList selectedRows = m_ui->contentTreeView->selectionModel()->selectedRows(0);
 
-        const int priorityGroups = 3;
-        const int priorityGroupSize = std::max((selectedRows.length() / priorityGroups), 1);
+        const qsizetype priorityGroups = 3;
+        const auto priorityGroupSize = std::max<qsizetype>((selectedRows.length() / priorityGroups), 1);
 
-        for (int i = 0; i < selectedRows.length(); ++i)
+        for (qsizetype i = 0; i < selectedRows.length(); ++i)
         {
             auto priority = BitTorrent::DownloadPriority::Ignored;
             switch (i / priorityGroupSize)
diff --git a/src/gui/properties/piecesbar.cpp b/src/gui/properties/piecesbar.cpp
index d9da364cb..0c9a253e1 100644
--- a/src/gui/properties/piecesbar.cpp
+++ b/src/gui/properties/piecesbar.cpp
@@ -143,7 +143,11 @@ bool PiecesBar::event(QEvent *e)
     return base::event(e);
 }
 
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+void PiecesBar::enterEvent(QEnterEvent *e)
+#else
 void PiecesBar::enterEvent(QEvent *e)
+#endif
 {
     m_hovered = true;
     base::enterEvent(e);
diff --git a/src/gui/properties/piecesbar.h b/src/gui/properties/piecesbar.h
index 66f2f3074..ec70aab6c 100644
--- a/src/gui/properties/piecesbar.h
+++ b/src/gui/properties/piecesbar.h
@@ -54,15 +54,19 @@ public:
     virtual void clear();
 
     // QObject interface
-    virtual bool event(QEvent*) override;
+    virtual bool event(QEvent *e) override;
 
 protected:
     // QWidget interface
-    void enterEvent(QEvent*) override;
-    void leaveEvent(QEvent*) override;
-    void mouseMoveEvent(QMouseEvent*) override;
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    void enterEvent(QEnterEvent *e) override;
+#else
+    void enterEvent(QEvent *e) override;
+#endif
+    void leaveEvent(QEvent *e) override;
+    void mouseMoveEvent(QMouseEvent *e) override;
 
-    void paintEvent(QPaintEvent*) override;
+    void paintEvent(QPaintEvent *e) override;
     void requestImageUpdate();
 
     QColor backgroundColor() const;
diff --git a/src/gui/properties/propertieswidget.cpp b/src/gui/properties/propertieswidget.cpp
index b05a592e8..90f1ea7f3 100644
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@@ -637,10 +637,10 @@ void PropertiesWidget::displayFilesListMenu(const QPoint &)
 
             const QModelIndexList selectedRows = m_ui->filesList->selectionModel()->selectedRows(0);
 
-            const int priorityGroups = 3;
-            const int priorityGroupSize = std::max((selectedRows.length() / priorityGroups), 1);
+            const qsizetype priorityGroups = 3;
+            const auto priorityGroupSize = std::max<qsizetype>((selectedRows.length() / priorityGroups), 1);
 
-            for (int i = 0; i < selectedRows.length(); ++i)
+            for (qsizetype i = 0; i < selectedRows.length(); ++i)
             {
                 auto priority = BitTorrent::DownloadPriority::Ignored;
                 switch (i / priorityGroupSize)
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index 28b072a78..0f661baef 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -37,7 +37,9 @@
 #if defined(Q_OS_WIN)
 #include <Windows.h>
 #include <Shellapi.h>
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
 #include <QtWin>
+#endif
 #else
 #include <QMimeDatabase>
 #include <QMimeType>
@@ -118,7 +120,11 @@ namespace
             if (FAILED(hr))
                 return {};
 
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+            auto iconPixmap = QPixmap::fromImage(QImage::fromHICON(sfi.hIcon));
+#else
             QPixmap iconPixmap = QtWin::fromHICON(sfi.hIcon);
+#endif
             ::DestroyIcon(sfi.hIcon);
             return iconPixmap;
         }