diff --git a/dev/deps/spark-deps-hadoop-2.2 b/dev/deps/spark-deps-hadoop-2.2
index 89bfcef4d9466b8c54600c1be012da590f032345..afbdae0554535a629cdc1df3ee751e9b87c26bf1 100644
--- a/dev/deps/spark-deps-hadoop-2.2
+++ b/dev/deps/spark-deps-hadoop-2.2
@@ -122,7 +122,7 @@ metrics-graphite-3.1.2.jar
 metrics-json-3.1.2.jar
 metrics-jvm-3.1.2.jar
 minlog-1.3.0.jar
-netty-3.8.0.Final.jar
+netty-3.9.9.Final.jar
 netty-all-4.0.42.Final.jar
 objenesis-2.1.jar
 opencsv-2.3.jar
diff --git a/dev/deps/spark-deps-hadoop-2.3 b/dev/deps/spark-deps-hadoop-2.3
index 8df3858825e1335700d79422725404cd692244ad..adf3863f6718c1835f27126c21e98f0d36f0cbde 100644
--- a/dev/deps/spark-deps-hadoop-2.3
+++ b/dev/deps/spark-deps-hadoop-2.3
@@ -129,7 +129,7 @@ metrics-json-3.1.2.jar
 metrics-jvm-3.1.2.jar
 minlog-1.3.0.jar
 mx4j-3.0.2.jar
-netty-3.8.0.Final.jar
+netty-3.9.9.Final.jar
 netty-all-4.0.42.Final.jar
 objenesis-2.1.jar
 opencsv-2.3.jar
diff --git a/dev/deps/spark-deps-hadoop-2.4 b/dev/deps/spark-deps-hadoop-2.4
index 71e7fb6dd243d301f969308c3dafb9174a76ab76..88e6b3fca08a4d42cb308545588eddd9f1cc9fd6 100644
--- a/dev/deps/spark-deps-hadoop-2.4
+++ b/dev/deps/spark-deps-hadoop-2.4
@@ -129,7 +129,7 @@ metrics-json-3.1.2.jar
 metrics-jvm-3.1.2.jar
 minlog-1.3.0.jar
 mx4j-3.0.2.jar
-netty-3.8.0.Final.jar
+netty-3.9.9.Final.jar
 netty-all-4.0.42.Final.jar
 objenesis-2.1.jar
 opencsv-2.3.jar
diff --git a/dev/deps/spark-deps-hadoop-2.6 b/dev/deps/spark-deps-hadoop-2.6
index ba31391495f54e20eb5a239be7b881686a797467..15c5d9f205f258d1701b2b334872749fb060fcc4 100644
--- a/dev/deps/spark-deps-hadoop-2.6
+++ b/dev/deps/spark-deps-hadoop-2.6
@@ -137,7 +137,7 @@ metrics-json-3.1.2.jar
 metrics-jvm-3.1.2.jar
 minlog-1.3.0.jar
 mx4j-3.0.2.jar
-netty-3.8.0.Final.jar
+netty-3.9.9.Final.jar
 netty-all-4.0.42.Final.jar
 objenesis-2.1.jar
 opencsv-2.3.jar
diff --git a/dev/deps/spark-deps-hadoop-2.7 b/dev/deps/spark-deps-hadoop-2.7
index b129e5a99e2ff86248d31ada79b0d7d4edac55be..77fb5370d98ba0c951e51760523ae9be509606d7 100644
--- a/dev/deps/spark-deps-hadoop-2.7
+++ b/dev/deps/spark-deps-hadoop-2.7
@@ -138,7 +138,7 @@ metrics-json-3.1.2.jar
 metrics-jvm-3.1.2.jar
 minlog-1.3.0.jar
 mx4j-3.0.2.jar
-netty-3.8.0.Final.jar
+netty-3.9.9.Final.jar
 netty-all-4.0.42.Final.jar
 objenesis-2.1.jar
 opencsv-2.3.jar
diff --git a/pom.xml b/pom.xml
index 33c8dcbb4fc733111e12b016e04c80698b8f33f0..2e67364d3ebe1d394016c126c359955bf1ccb557 100644
--- a/pom.xml
+++ b/pom.xml
@@ -557,7 +557,7 @@
       <dependency>
         <groupId>io.netty</groupId>
         <artifactId>netty</artifactId>
-        <version>3.8.0.Final</version>
+        <version>3.9.9.Final</version>
       </dependency>
       <dependency>
         <groupId>org.apache.derby</groupId>