diff --git a/build.gradle b/build.gradle
index 7a4c891eb648035e4000e77947c7747fd0993edf..1f1d27fea0231e7383aa2e002e6feffcb45784e6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,10 @@ apply plugin: 'maven'
 
 project.version = '3.2.9-SNAPSHOT'
 project.group = 'de.stups'
-sourceCompatibility = 1.5
+allprojects {
+    sourceCompatibility = 1.6
+    targetCompatibility = 1.6
+}
 
 repositories {
     maven {