diff --git a/Core/pom.xml b/Core/pom.xml
index 81754cd5..14751f6b 100644
--- a/Core/pom.xml
+++ b/Core/pom.xml
@@ -311,7 +311,7 @@
         <dependency>
             <groupId>com.songoda</groupId>
             <artifactId>UltimateStacker</artifactId>
-            <version>2.1.1</version>
+            <version>2.3.1-Dev</version>
             <scope>provided</scope>
         </dependency>