diff --git a/resources/desktop/rssguard.metainfo.xml.in b/resources/desktop/rssguard.metainfo.xml.in
index 8f3f27b2c..5da01b359 100644
--- a/resources/desktop/rssguard.metainfo.xml.in
+++ b/resources/desktop/rssguard.metainfo.xml.in
@@ -60,7 +60,7 @@
   <content_rating type="oars-1.0" />
   <content_rating type="oars-1.1" />
   <releases>
-    <release version="4.2.7" date="2023-01-04" />
+    <release version="4.2.7" date="2023-01-05" />
   </releases>
   <provides>
     <binary>@APP_LOW_NAME@</binary>
diff --git a/src/librssguard/core/feeddownloader.cpp b/src/librssguard/core/feeddownloader.cpp
index ec512e8f0..77cc6c82c 100644
--- a/src/librssguard/core/feeddownloader.cpp
+++ b/src/librssguard/core/feeddownloader.cpp
@@ -82,23 +82,14 @@ void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
     qDebugNN << LOGSEC_FEEDDOWNLOADER << "No feeds to update in worker thread, aborting update.";
   }
   else {
-    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Starting feed updates from worker in thread: '" << QThread::currentThreadId()
-             << "'.";
+    qDebugNN << LOGSEC_FEEDDOWNLOADER << "Starting feed updates from worker in thread"
+             << QUOTE_W_SPACE_DOT(QThread::currentThreadId());
 
     // Job starts now.
     emit updateStarted();
     QSet<CacheForServiceRoot*> caches;
     QMultiHash<ServiceRoot*, Feed*> feeds_per_root;
 
-    // 1. key - account.
-    // 2. key - feed custom ID.
-    // 3. key - msg state.
-    QHash<ServiceRoot*, QHash<QString, QHash<ServiceRoot::BagOfMessages, QStringList>>> stated_messages;
-
-    // 1. key - account.
-    // 2. key - label custom ID.
-    QHash<ServiceRoot*, QHash<QString, QStringList>> tagged_messages;
-
     for (auto* fd : feeds) {
       CacheForServiceRoot* fd_cache = fd->getParentServiceRoot()->toCache();
 
@@ -112,21 +103,17 @@ void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
     synchronizeAccountCaches(caches.values(), false);
 
     auto roots = feeds_per_root.uniqueKeys();
-    bool is_main_thread = QThread::currentThread() == qApp->thread();
-    QSqlDatabase database = is_main_thread ? qApp->database()->driver()->connection(metaObject()->className())
-                                           : qApp->database()->driver()->connection(QSL("feed_upd"));
+    QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
 
     for (auto* rt : roots) {
       auto fds = feeds_per_root.values(rt);
+      QHash<QString, QStringList> per_acc_tags;
+      QHash<QString, QHash<ServiceRoot::BagOfMessages, QStringList>> per_acc_states;
 
       // Obtain lists of local IDs.
       if (rt->wantsBaggedIdsOfExistingMessages()) {
         // Tags per account.
-        auto per_acc_tags = DatabaseQueries::bagsOfMessages(database, rt->labelsNode()->labels());
-
-        tagged_messages.insert(rt, per_acc_tags);
-
-        QHash<QString, QHash<ServiceRoot::BagOfMessages, QStringList>> per_acc_states;
+        per_acc_tags = DatabaseQueries::bagsOfMessages(database, rt->labelsNode()->labels());
 
         // This account has activated intelligent downloading of messages.
         // Prepare bags.
@@ -151,8 +138,6 @@ void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
 
           m_feeds.append(fu);
         }
-
-        stated_messages.insert(rt, per_acc_states);
       }
       else {
         for (Feed* fd : fds) {
@@ -166,7 +151,7 @@ void FeedDownloader::updateFeeds(const QList<Feed*>& feeds) {
       }
 
       try {
-        rt->aboutToBeginFeedFetching(fds, stated_messages.value(rt), tagged_messages.value(rt));
+        rt->aboutToBeginFeedFetching(fds, per_acc_states, per_acc_tags);
       }
       catch (const ApplicationException& ex) {
         // Common error showed, all feeds from the root are errored now!
diff --git a/src/librssguard/miscellaneous/settings.cpp b/src/librssguard/miscellaneous/settings.cpp
index 9edb1e1e8..ea135a409 100644
--- a/src/librssguard/miscellaneous/settings.cpp
+++ b/src/librssguard/miscellaneous/settings.cpp
@@ -438,7 +438,8 @@ DVALUE(QStringList) Browser::ExternalToolsDef = QStringList();
 DKEY CategoriesExpandStates::ID = "categories_expand_states";
 
 Settings::Settings(const QString& file_name, Format format, SettingsProperties::SettingsType type, QObject* parent)
-  : QSettings(file_name, format, parent), m_initializationStatus(type) {
+  : QSettings(file_name, format, parent), m_lock(QReadWriteLock(QReadWriteLock::RecursionMode::Recursive)),
+    m_initializationStatus(type) {
   Messages::PreviewerFontStandardDef = QFont(QApplication::font().family(), 12).toString();
 }
 
diff --git a/src/librssguard/miscellaneous/settings.h b/src/librssguard/miscellaneous/settings.h
index cfbd56591..f8d25f301 100644
--- a/src/librssguard/miscellaneous/settings.h
+++ b/src/librssguard/miscellaneous/settings.h
@@ -14,7 +14,9 @@
 #include <QColor>
 #include <QDateTime>
 #include <QNetworkProxy>
+#include <QReadWriteLock>
 #include <QStringList>
+#include <QWriteLocker>
 
 #define KEY extern const QString
 #define DKEY const QString
@@ -518,12 +520,13 @@ class Settings : public QSettings {
     static SettingsProperties determineProperties();
 
   private:
-    // Constructor.
     explicit Settings(const QString& file_name,
                       Format format,
                       SettingsProperties::SettingsType type,
                       QObject* parent = nullptr);
 
+  private:
+    mutable QReadWriteLock m_lock;
     SettingsProperties::SettingsType m_initializationStatus;
 };
 
@@ -545,10 +548,12 @@ inline QVariant Settings::value(const QString& section, const QString& key, cons
 }
 
 inline void Settings::setValue(const QString& section, const QString& key, const QVariant& value) {
+  QWriteLocker lck(&m_lock);
   QSettings::setValue(QString(QSL("%1/%2")).arg(section, key), value);
 }
 
 inline void Settings::setValue(const QString& key, const QVariant& value) {
+  QWriteLocker lck(&m_lock);
   QSettings::setValue(key, value);
 }
 
@@ -557,6 +562,8 @@ inline bool Settings::contains(const QString& section, const QString& key) const
 }
 
 inline void Settings::remove(const QString& section, const QString& key) {
+  QWriteLocker lck(&m_lock);
+
   if (key.isEmpty()) {
     beginGroup(section);
     QSettings::remove({});
diff --git a/src/librssguard/network-web/cookiejar.cpp b/src/librssguard/network-web/cookiejar.cpp
index b819f7bae..fd0414b25 100644
--- a/src/librssguard/network-web/cookiejar.cpp
+++ b/src/librssguard/network-web/cookiejar.cpp
@@ -120,10 +120,12 @@ void CookieJar::saveCookies() {
 }
 
 QList<QNetworkCookie> CookieJar::cookiesForUrl(const QUrl& url) const {
+  QReadLocker l(&m_lock);
   return QNetworkCookieJar::cookiesForUrl(url);
 }
 
 bool CookieJar::setCookiesFromUrl(const QList<QNetworkCookie>& cookie_list, const QUrl& url) {
+  QWriteLocker l(&m_lock);
   return QNetworkCookieJar::setCookiesFromUrl(cookie_list, url);
 }
 
@@ -188,11 +190,13 @@ bool CookieJar::insertCookie(const QNetworkCookie& cookie) {
     return {};
   }
   else {
+    QWriteLocker l(&m_lock);
     return insertCookieInternal(cookie, false, true);
   }
 }
 
 bool CookieJar::deleteCookie(const QNetworkCookie& cookie) {
+  QWriteLocker l(&m_lock);
   return deleteCookieInternal(cookie, false);
 }
 
@@ -206,5 +210,12 @@ void CookieJar::updateSettings() {
 }
 
 bool CookieJar::updateCookie(const QNetworkCookie& cookie) {
+  QWriteLocker l(&m_lock);
   return updateCookieInternal(cookie, false);
 }
+
+/*
+bool CookieJar::validateCookie(const QNetworkCookie &cookie, const QUrl &url) const {
+  return QNetworkCookieJar::validateCookie(cookie, url);
+}
+*/
diff --git a/src/librssguard/network-web/cookiejar.h b/src/librssguard/network-web/cookiejar.h
index 59f97e4ad..5409685f5 100644
--- a/src/librssguard/network-web/cookiejar.h
+++ b/src/librssguard/network-web/cookiejar.h
@@ -5,6 +5,8 @@
 
 #include <QNetworkCookieJar>
 
+#include <QReadWriteLock>
+
 #if defined(USE_WEBENGINE)
 class QWebEngineCookieStore;
 #endif
@@ -18,6 +20,7 @@ class CookieJar : public QNetworkCookieJar {
     virtual bool insertCookie(const QNetworkCookie& cookie);
     virtual bool updateCookie(const QNetworkCookie& cookie);
     virtual bool deleteCookie(const QNetworkCookie& cookie);
+    // virtual bool validateCookie(const QNetworkCookie& cookie, const QUrl& url) const;
 
     void updateSettings();
 
@@ -37,6 +40,7 @@ class CookieJar : public QNetworkCookieJar {
     QWebEngineCookieStore* m_webEngineCookies;
 #endif
 
+    mutable QReadWriteLock m_lock{QReadWriteLock::RecursionMode::Recursive};
     bool m_ignoreAllCookies;
 };