diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20871780230bf339e39c97b0dd9424ef79e6bfb7..d815489d8870227c461523c183e6dee2566fa39c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 2.4.3
+This release fixes a performance issue on session creation affecting large
+installations.
+
+Bug fixes:
+* WebSocket communication now works correctly for course sessions.
+  (only affects installations using the LMS connector)
+* The configuration parameter `security.facebook.allowed-roles` is now
+  respected.
+
+Additional changes:
+* Libraries have been upgraded to fix potential bugs
+
 ## 2.5
 Major features:
 * Administration API: New endpoints have been added which are accessible by
diff --git a/src/main/java/de/thm/arsnova/dao/CouchDBDao.java b/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
index febfee4d701ff89d532c7ef8bc5651976e0af247..97ba67f91da8d9d7651c861d26e69cdd1b47b247 100644
--- a/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
+++ b/src/main/java/de/thm/arsnova/dao/CouchDBDao.java
@@ -522,9 +522,9 @@ public class CouchDBDao implements IDatabaseDao, ApplicationEventPublisherAware
 	}
 
 	@Override
-	@Transactional(isolation = Isolation.READ_COMMITTED)
 	public boolean sessionKeyAvailable(final String keyword) {
 		final View view = new View("session/by_keyword");
+		view.setKey(keyword);
 		final ViewResults results = getDatabase().view(view);
 
 		return !results.containsKey(keyword);