diff --git a/assignment4/pom.xml b/assignment4/pom.xml
index 5027bdf..93d5786 100644
--- a/assignment4/pom.xml
+++ b/assignment4/pom.xml
@@ -26,6 +26,7 @@
         <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-compiler-plugin</artifactId>
+            <version>3.6.0</version>
             <configuration>
                 <source>1.8</source>
                 <target>1.8</target>