diff --git a/build.gradle b/build.gradle
index 9820811..979c054 100644
--- a/build.gradle
+++ b/build.gradle
@@ -92,7 +92,7 @@ dependencies {
     testCompile group: 'org.powermock', name: 'powermock-api-mockito', version: '1.6.5'
     testCompile group: 'org.powermock', name: 'powermock-module-junit4-rule-agent', version: '1.6.5'
 
-    testCompile 'org.assertj:assertj-core:3.9.0'
+    testCompile 'org.assertj:assertj-core:3.12.2'
 
     testCompile group: 'org.hamcrest', name: 'hamcrest-all', version: '1.3'