Upgrade Hadoop version.
diff --git a/pom.xml b/pom.xml
index fe02804..d33954c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -64,7 +64,7 @@
     <maven-jxr-plugin.version>2.5</maven-jxr-plugin.version>
     <mockito.version>2.7.22</mockito.version>
     <netty.version>4.0.52.Final</netty.version>
-    <hadoop.version>3.0.3</hadoop.version>
+    <hadoop.version>3.1.1</hadoop.version>
     <bouncycastle.version>1.60</bouncycastle.version>
     <jersey.container.version>2.17</jersey.container.version>
     <jersey.version>1.19</jersey.version>