diff --git a/build.gradle b/build.gradle
index 1f1d27fea0231e7383aa2e002e6feffcb45784e6..2b44f6227418ad2e2735fd92c48d4b5b353e52a7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,8 +6,8 @@ apply plugin: 'maven'
 project.version = '3.2.9-SNAPSHOT'
 project.group = 'de.stups'
 allprojects {
-    sourceCompatibility = 1.6
-    targetCompatibility = 1.6
+    sourceCompatibility = 1.5
+    targetCompatibility = 1.5
 }
 
 repositories {