diff --git a/spark-2.1.1/pom.xml b/spark-2.1.1/pom.xml
index a985cf0..6e32470 100644
--- a/spark-2.1.1/pom.xml
+++ b/spark-2.1.1/pom.xml
@@ -553,7 +553,7 @@
       <dependency>
         <groupId>commons-net</groupId>
         <artifactId>commons-net</artifactId>
-        <version>2.2</version>
+        <version>3.9.0</version>
       </dependency>
       <dependency>
         <groupId>io.netty</groupId>