diff --git a/build.gradle b/build.gradle
index 2951933b..5dc386f7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,7 +18,7 @@ ext {
             hamcrestCore: 'org.hamcrest:hamcrest-core:1.3',
             hamcrestLibrary: 'org.hamcrest:hamcrest-library:1.3',
 
-            test: ['org.slf4j:slf4j-simple:1.7.12', 'org.assertj:assertj-core:3.1.0', 'commons-io:commons-io:2.4','org.hamcrest:hamcrest-core:1.3', 'org.hamcrest:hamcrest-library:1.3', 'junit:junit:4.12']
+            test: ['org.slf4j:slf4j-simple:1.7.12', 'org.assertj:assertj-core:2.1.0', 'commons-io:commons-io:2.4','org.hamcrest:hamcrest-core:1.3', 'org.hamcrest:hamcrest-library:1.3', 'junit:junit:4.12']
     ]
     snapshotVersion = true
 }