diff --git a/symmetric/pom.xml b/symmetric/pom.xml
index 06438cab0f..5cd9751a5e 100644
--- a/symmetric/pom.xml
+++ b/symmetric/pom.xml
@@ -399,7 +399,7 @@
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
-            <version>5.6</version>
+            <version>5.5</version>
             <classifier>jdk15</classifier>
             <scope>test</scope>
         </dependency>