diff --git a/external/flume-sink/pom.xml b/external/flume-sink/pom.xml
index 75c6f0596eae6..37640a01dd465 100644
--- a/external/flume-sink/pom.xml
+++ b/external/flume-sink/pom.xml
@@ -86,7 +86,7 @@
       -->
       <groupId>io.netty</groupId>
       <artifactId>netty</artifactId>
-      <version>3.4.0.Final</version>
+      <version>3.9.8.Final</version>
       <scope>test</scope>
     </dependency>
     <dependency>
diff --git a/pom.xml b/pom.xml
index 7035938515a58..849af9e804d50 100644
--- a/pom.xml
+++ b/pom.xml
@@ -614,7 +614,7 @@
       <dependency>
         <groupId>io.netty</groupId>
         <artifactId>netty</artifactId>
-        <version>3.8.0.Final</version>
+        <version>3.9.8.Final</version>
       </dependency>
       <dependency>
         <groupId>org.apache.derby</groupId>