diff --git a/pom.xml b/pom.xml
index a4f4a9b..264263b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -29,8 +29,8 @@
         <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
         <immutables-value.version>2.5.6</immutables-value.version>
 
-        <assertj.version>3.8.0</assertj.version>
         <mockito.version>2.13.0</mockito.version>
+        <assertj.version>3.9.0</assertj.version>
     </properties>
 
     <modules>