diff --git a/build.gradle b/build.gradle
index 42cdc17c1f213adced7578e8943158b0c80dbf88..b25fb22a6c4db6e06c857e5ac3349eeda5d40992 100644
--- a/build.gradle
+++ b/build.gradle
@@ -31,7 +31,7 @@ project(':de.prob.core') {
 	}
 
 
-        def parser_version = '2.6.3'
+        def parser_version = '2.5.6'
 
 	dependencies {
 	 compile group: "de.hhu.stups", name: "answerparser", version: parser_version , changing: true
diff --git a/de.prob.core/build.gradle b/de.prob.core/build.gradle
index 80f747e2ef91ece50de98ee0940182400e7ae953..489b694f2a33e972b1e014aae296da99fe536a5a 100644
--- a/de.prob.core/build.gradle
+++ b/de.prob.core/build.gradle
@@ -1,6 +1,6 @@
 apply plugin: 'java'
 
-def parser_version = '2.6.3'
+def parser_version = '2.5.6'
 
 dependencies {
  compile group: "de.hhu.stups", name: "answerparser", version: parser_version , changing: true