diff --git a/services/subnet_manager/pom.xml b/services/subnet_manager/pom.xml
index 3e23cc0d5..4544ba676 100644
--- a/services/subnet_manager/pom.xml
+++ b/services/subnet_manager/pom.xml
@@ -116,7 +116,7 @@ Copyright(c) 2020 Futurewei Cloud
         <dependency>
             <groupId>commons-net</groupId>
             <artifactId>commons-net</artifactId>
-            <version>3.6</version>
+            <version>3.9.0</version>
         </dependency>
         <dependency>
             <groupId>org.mockito</groupId>
diff --git a/services/vpc_manager/pom.xml b/services/vpc_manager/pom.xml
index bd3c193b4..2943491c6 100644
--- a/services/vpc_manager/pom.xml
+++ b/services/vpc_manager/pom.xml
@@ -118,7 +118,7 @@ Copyright(c) 2020 Futurewei Cloud
         <dependency>
             <groupId>commons-net</groupId>
             <artifactId>commons-net</artifactId>
-            <version>3.6</version>
+            <version>3.9.0</version>
         </dependency>
         <dependency>
             <groupId>org.mockito</groupId>