diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb1d1815..c39e2ecc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+4.3.1
+========================
+* Fixed bug in server communication. The server always returned HTTP 400,
+  because of an inverted "if-condition".
+* Fixed bug in the post-processing variable replacement. The error occurs,
+  if you use a variable, which value resolves to nothing (null)
+
 4.3.0
 ========================
 * Added mechanism to group models. This mechanism can also be used to define
diff --git a/client/pom.xml b/client/pom.xml
index bca70608..45300a57 100644
--- a/client/pom.xml
+++ b/client/pom.xml
@@ -8,7 +8,7 @@
 	<parent>
 		<groupId>ctbrec</groupId>
 		<artifactId>master</artifactId>
-		<version>4.3.0</version>
+		<version>4.3.1</version>
 		<relativePath>../master</relativePath>
 	</parent>
 
diff --git a/common/pom.xml b/common/pom.xml
index ec08fb6d..bbbddbbd 100644
--- a/common/pom.xml
+++ b/common/pom.xml
@@ -8,7 +8,7 @@
 	<parent>
 		<groupId>ctbrec</groupId>
 		<artifactId>master</artifactId>
-		<version>4.3.0</version>
+		<version>4.3.1</version>
 		<relativePath>../master</relativePath>
 	</parent>
 
diff --git a/master/pom.xml b/master/pom.xml
index ffcd5088..1eb115b0 100644
--- a/master/pom.xml
+++ b/master/pom.xml
@@ -6,7 +6,7 @@
 	<groupId>ctbrec</groupId>
 	<artifactId>master</artifactId>
 	<packaging>pom</packaging>
-	<version>4.3.0</version>
+	<version>4.3.1</version>
 
 	<modules>
 		<module>../common</module>
diff --git a/server/pom.xml b/server/pom.xml
index 2e1c78e3..7ffc3a4d 100644
--- a/server/pom.xml
+++ b/server/pom.xml
@@ -8,7 +8,7 @@
 	<parent>
         <groupId>ctbrec</groupId>
         <artifactId>master</artifactId>
-        <version>4.3.0</version>
+        <version>4.3.1</version>
         <relativePath>../master</relativePath>
     </parent>