diff --git a/src/gui/src/ActivationNotifier.cpp b/src/gui/src/ActivationNotifier.cpp
index fb2fd465..e8159a34 100644
--- a/src/gui/src/ActivationNotifier.cpp
+++ b/src/gui/src/ActivationNotifier.cpp
@@ -20,7 +20,7 @@
 #include "CoreInterface.h"
 
 ActivationNotifier::ActivationNotifier(QObject *parent) :
-    QObject(parent)
+	QObject(parent)
 {
 }
 
@@ -29,6 +29,15 @@ void ActivationNotifier::setIdentity(QString identity)
 	m_Identity = identity;
 }
 
+void ActivationNotifier::setUpgradeInfo(QString const& fromVersion,
+										QString const& toVersion,
+										QString const& serialKey)
+{
+	m_fromVersion = fromVersion;
+	m_toVersion = toVersion;
+	m_serialKey = serialKey;
+}
+
 void ActivationNotifier::notify()
 {
 	CoreInterface coreInterface;
@@ -39,3 +48,13 @@ void ActivationNotifier::notify()
 		// catch all exceptions and fails silently
 	}
 }
+
+void ActivationNotifier::notifyUpgrade()
+{
+	try {
+		CoreInterface coreInterface;
+		coreInterface.notifyUpdate(m_fromVersion, m_toVersion,
+									m_serialKey);
+	} catch (...) {
+	}
+}
diff --git a/src/gui/src/ActivationNotifier.h b/src/gui/src/ActivationNotifier.h
index d245cd27..fda336a4 100644
--- a/src/gui/src/ActivationNotifier.h
+++ b/src/gui/src/ActivationNotifier.h
@@ -24,18 +24,24 @@ class ActivationNotifier : public QObject
 {
 Q_OBJECT
 public:
-    explicit ActivationNotifier(QObject *parent = 0);
+	explicit ActivationNotifier(QObject *parent = 0);
 
 	void setIdentity(QString identity);
+	void setUpgradeInfo(QString const& fromVersion,
+						QString const& toVersion, QString const& serialKey);
 
 public slots:
 	void notify();
+	void notifyUpgrade();
 
 signals:
 	void finished();
 
 private:
 	QString m_Identity;
+	QString m_fromVersion;
+	QString m_toVersion;
+	QString m_serialKey;
 };
 
 #endif // ACTIVATIONNOTIFIER_H
diff --git a/src/gui/src/CoreInterface.cpp b/src/gui/src/CoreInterface.cpp
index 8b3a1ae3..aa8d14a3 100644
--- a/src/gui/src/CoreInterface.cpp
+++ b/src/gui/src/CoreInterface.cpp
@@ -62,10 +62,11 @@ QString CoreInterface::getSerialKeyFilePath()
 	return filename;
 }
 
-QString CoreInterface::notifyUpgrade (QString const& version, 
-										QString const& serialKey) {
+QString CoreInterface::notifyUpdate (QString const& fromVersion,
+									  QString const& toVersion,
+									  QString const& serialKey) {
 	QStringList args("--notify-upgrade");
-	QString input(version + ":" + serialKey);
+	QString input(fromVersion + ":" + toVersion + ":" + serialKey);
 	return run(args, input);
 }
 
diff --git a/src/gui/src/CoreInterface.h b/src/gui/src/CoreInterface.h
index 3576f02a..98a84f57 100644
--- a/src/gui/src/CoreInterface.h
+++ b/src/gui/src/CoreInterface.h
@@ -29,6 +29,8 @@ public:
 	QString getArch();
 	QString getSerialKeyFilePath();
 	QString notifyActivation(const QString& identity);
-	QString notifyUpgrade (QString const& version, QString const& serialKey);
+	QString notifyUpdate (QString const& fromVersion,
+						   QString const& toVersion,
+						   QString const& serialKey);
 	QString run(const QStringList& args, const QString& input = "");
 };
diff --git a/src/gui/src/LicenseManager.cpp b/src/gui/src/LicenseManager.cpp
index 15f79933..97a1826a 100644
--- a/src/gui/src/LicenseManager.cpp
+++ b/src/gui/src/LicenseManager.cpp
@@ -72,8 +72,21 @@ LicenseManager::setSerialKey(QString serialKeyString, bool acceptExpired)
 }
 
 void
-LicenseManager::notifyUpdate(QString version) {
+LicenseManager::notifyUpdate(QString fromVersion, QString toVersion) {
+	ActivationNotifier* notifier = new ActivationNotifier();
+	notifier->setUpgradeInfo (fromVersion, toVersion,
+							QString::fromStdString(m_serialKey.toString()));
 
+	QThread* thread = new QThread();
+	connect(notifier, SIGNAL(finished()), thread, SLOT(quit()));
+	connect(notifier, SIGNAL(finished()), notifier, SLOT(deleteLater()));
+	connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
+
+	notifier->moveToThread(thread);
+	thread->start();
+
+	QMetaObject::invokeMethod(notifier, "notifyUpgrade",
+							  Qt::QueuedConnection);
 }
 
 Edition
diff --git a/src/gui/src/LicenseManager.h b/src/gui/src/LicenseManager.h
index 4d235369..4592b28e 100644
--- a/src/gui/src/LicenseManager.h
+++ b/src/gui/src/LicenseManager.h
@@ -36,7 +36,7 @@ public:
 	QString activeEditionName() const;
 	SerialKey serialKey() const;
 	void skipActivation();
-	void notifyUpdate(QString version);
+	void notifyUpdate(QString fromVersion, QString toVersion);
 	static QString getEditionName(Edition edition, bool trial = false);
 
 private:
diff --git a/src/gui/src/MainWindow.cpp b/src/gui/src/MainWindow.cpp
index 59808220..19a1dfa2 100644
--- a/src/gui/src/MainWindow.cpp
+++ b/src/gui/src/MainWindow.cpp
@@ -157,9 +157,12 @@ MainWindow::MainWindow(QSettings& settings, AppConfig& appConfig,
 	setWindowTitle (m_LicenseManager->activeEditionName());
 	m_LicenseManager->refresh();
 
+	QString lastVersion = m_AppConfig->lastVersion();
 	QString currentVersion = m_VersionChecker.getVersion();
-	if (m_AppConfig->lastVersion() != currentVersion) {
+	if (lastVersion != currentVersion) {
 		m_AppConfig->setLastVersion (currentVersion);
+		m_AppConfig->saveSettings();
+		m_LicenseManager->notifyUpdate (lastVersion, currentVersion);
 	}
 }
 
diff --git a/src/lib/synergy/ToolApp.cpp b/src/lib/synergy/ToolApp.cpp
index 434ae684..22a871b8 100644
--- a/src/lib/synergy/ToolApp.cpp
+++ b/src/lib/synergy/ToolApp.cpp
@@ -146,11 +146,12 @@ ToolApp::notifyUpgrade()
 	std::vector<String> parts = synergy::string::splitString(data, ':');
 	size_t count = parts.size();
 
-	if (count == 2) {
+	if (count == 3) {
      	std::stringstream ss;
 		ss << JSON_URL << "notify/upgraded/";
-		ss << "?version=" << parts[0];
-		ss << "&serial=" << parts[1];
+		ss << "?from=" << parts[0];
+		ss << "&to=" << parts[1];
+		ss << "&serial=" << parts[2];
 
 		std::cout << ARCH->internet().get(ss.str()) << std::endl;
 	}