diff --git a/build.xml b/build.xml
index 04cbf1a..0b00f6c 100644
--- a/build.xml
+++ b/build.xml
@@ -13,7 +13,7 @@
   <path id="junit">
     <file name="${basedir}/../../../lib/junit-4.12.jar"/>
     <file name="${basedir}/../../../lib/hamcrest-core-1.3.jar"/>
-    <file name="${basedir}/../../../lib/dev/assertj-core-3.4.1.jar"/>
+    <file name="${basedir}/../../../lib/dev/assertj-core-3.6.1.jar"/>
   </path>
 
   <target name="clean" depends="init">