Bumping netty version.

Change-Id: Iec0f4fa83d7f2e9bbe12b21c620d479155055dd7
diff --git a/lib/deps.json b/lib/deps.json
index b0848c4..fdc04e7 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -169,13 +169,13 @@
     "minimal-json": "mvn:com.eclipsesource.minimal-json:minimal-json:0.9.4",
     "minlog": "mvn:com.esotericsoftware:minlog:1.3.0",
     "netty": "mvn:io.netty:netty:3.10.5.Final",
-    "netty-buffer": "mvn:io.netty:netty-buffer:4.1.5.Final",
-    "netty-codec": "mvn:io.netty:netty-codec:4.1.5.Final",
-    "netty-common": "mvn:io.netty:netty-common:4.1.5.Final",
-    "netty-handler": "mvn:io.netty:netty-handler:4.1.5.Final",
-    "netty-transport": "mvn:io.netty:netty-transport:4.1.5.Final",
-    "netty-transport-native-epoll": "mvn:io.netty:netty-transport-native-epoll:4.1.5.Final",
-    "netty-resolver": "mvn:io.netty:netty-resolver:4.1.5.Final",
+    "netty-buffer": "mvn:io.netty:netty-buffer:4.1.8.Final",
+    "netty-codec": "mvn:io.netty:netty-codec:4.1.8.Final",
+    "netty-common": "mvn:io.netty:netty-common:4.1.8.Final",
+    "netty-handler": "mvn:io.netty:netty-handler:4.1.8.Final",
+    "netty-transport": "mvn:io.netty:netty-transport:4.1.8.Final",
+    "netty-transport-native-epoll": "mvn:io.netty:netty-transport-native-epoll:4.1.8.Final",
+    "netty-resolver": "mvn:io.netty:netty-resolver:4.1.8.Final",
     "catalyst-concurrent": "mvn:io.atomix.catalyst:catalyst-concurrent:1.2.1",
     "catalyst-netty": "mvn:io.atomix.catalyst:catalyst-netty:1.2.1",
     "catalyst-transport": "mvn:io.atomix.catalyst:catalyst-transport:1.2.1",