diff -Nru libqmatrixclient-0.4.1/CMakeLists.txt libqmatrixclient-0.4.2.1/CMakeLists.txt
--- libqmatrixclient-0.4.1/CMakeLists.txt	2018-12-06 12:01:06.000000000 +0000
+++ libqmatrixclient-0.4.2.1/CMakeLists.txt	2019-01-13 09:54:44.000000000 +0000
@@ -140,7 +140,7 @@
             ${libqmatrixclient_cswellknown_SRCS}
             ${libqmatrixclient_asdef_SRCS} ${libqmatrixclient_isdef_SRCS})
 set(API_VERSION "0.4")
-set_property(TARGET QMatrixClient PROPERTY VERSION "${API_VERSION}.0")
+set_property(TARGET QMatrixClient PROPERTY VERSION "${API_VERSION}.2.1")
 set_property(TARGET QMatrixClient PROPERTY SOVERSION ${API_VERSION} )
 set_property(TARGET QMatrixClient PROPERTY
              INTERFACE_QMatrixClient_MAJOR_VERSION ${API_VERSION})
diff -Nru libqmatrixclient-0.4.1/debian/changelog libqmatrixclient-0.4.2.1/debian/changelog
--- libqmatrixclient-0.4.1/debian/changelog	2018-12-24 20:11:03.000000000 +0000
+++ libqmatrixclient-0.4.2.1/debian/changelog	2019-01-14 16:21:36.000000000 +0000
@@ -1,3 +1,9 @@
+libqmatrixclient (0.4.2.1-1) unstable; urgency=medium
+
+  * New upstream release.
+
+ -- Hubert Chathi <uhoreg@debian.org>  Mon, 14 Jan 2019 11:21:36 -0500
+
 libqmatrixclient (0.4.1-1) unstable; urgency=medium
 
   * Initial release of splitting the library out from quaternion.
diff -Nru libqmatrixclient-0.4.1/examples/qmc-example.cpp libqmatrixclient-0.4.2.1/examples/qmc-example.cpp
--- libqmatrixclient-0.4.1/examples/qmc-example.cpp	2018-12-06 12:01:06.000000000 +0000
+++ libqmatrixclient-0.4.2.1/examples/qmc-example.cpp	2019-01-13 09:54:44.000000000 +0000
@@ -5,6 +5,7 @@
 #include "csapi/room_send.h"
 #include "csapi/joining.h"
 #include "csapi/leaving.h"
+#include "events/simplestateevents.h"
 
 #include <QtCore/QCoreApplication>
 #include <QtCore/QStringBuilder>
@@ -27,6 +28,7 @@
         void onNewRoom(Room* r);
         void startTests();
             void sendMessage();
+            void setTopic();
             void addAndRemoveTag();
             void sendAndRedact();
                 void checkRedactionOutcome(const QString& evtIdToRedact,
@@ -143,6 +145,7 @@
 {
     cout << "Starting tests" << endl;
     sendMessage();
+    setTopic();
     addAndRemoveTag();
     sendAndRedact();
     markDirectChat();
@@ -168,6 +171,49 @@
     // Independently, check when it shows up in the timeline.
 }
 
+void QMCTest::setTopic()
+{
+    running.push_back("State setting test");
+    running.push_back("Fake state event immunity test");
+    auto initialTopic = targetRoom->topic();
+
+    const auto newTopic = c->generateTxnId();
+    targetRoom->setTopic(newTopic); // Sets the state by proper means
+    const auto fakeTopic = c->generateTxnId();
+    targetRoom->postJson(RoomTopicEvent::matrixTypeId(), // Fake state event
+                         RoomTopicEvent(fakeTopic).contentJson());
+
+    {
+        auto* context = new QObject;
+        connect(targetRoom, &Room::topicChanged, context,
+            [this,newTopic,fakeTopic,initialTopic,context] {
+                if (targetRoom->topic() == newTopic)
+                {
+                    QMC_CHECK("State setting test", true);
+                    // Don't reset the topic yet if the negative test still runs
+                    if (!running.contains("Fake state event immunity test"))
+                        targetRoom->setTopic(initialTopic);
+
+                    context->deleteLater();
+                }
+            });
+    }
+
+    {
+        auto* context = new QObject;
+        connect(targetRoom, &Room::pendingEventAboutToMerge, context,
+            [this,fakeTopic,initialTopic,context] (const RoomEvent* e, int) {
+                if (e->contentJson().value("topic").toString() != fakeTopic)
+                    return; // Wait on for the right event
+
+                QMC_CHECK("Fake state event immunity test", !e->isStateEvent());
+                if (!running.contains("State setting test"))
+                    targetRoom->setTopic(initialTopic);
+                context->deleteLater();
+            });
+    }
+}
+
 void QMCTest::addAndRemoveTag()
 {
     running.push_back("Tagging test");
diff -Nru libqmatrixclient-0.4.1/lib/events/stateevent.cpp libqmatrixclient-0.4.2.1/lib/events/stateevent.cpp
--- libqmatrixclient-0.4.1/lib/events/stateevent.cpp	2018-12-06 12:01:06.000000000 +0000
+++ libqmatrixclient-0.4.2.1/lib/events/stateevent.cpp	2019-01-13 09:54:44.000000000 +0000
@@ -21,7 +21,17 @@
 using namespace QMatrixClient;
 
 [[gnu::unused]] static auto stateEventTypeInitialised =
-        RoomEvent::factory_t::chainFactory<StateEventBase>();
+    RoomEvent::factory_t::addMethod(
+        [] (const QJsonObject& json, const QString& matrixType) -> StateEventPtr
+        {
+            if (!json.contains("state_key"))
+                return nullptr;
+
+            if (auto e = StateEventBase::factory_t::make(json, matrixType))
+                return e;
+
+            return nullptr;
+        });
 
 bool StateEventBase::repeatsState() const
 {