diff --git a/pom.xml b/pom.xml
index 840197282..cd6ca18f4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -163,8 +163,7 @@
             <dependency>
                 <groupId>org.assertj</groupId>
                 <artifactId>assertj-core</artifactId>
-                <!-- use 2.9.1 for Java 7 projects -->
-                <version>3.11.1</version>
+                <version>2.9.1</version>
                 <scope>test</scope>
             </dependency>