diff --git a/build.gradle b/build.gradle
index 5f54ca9eb3..7005cde1be 100644
--- a/build.gradle
+++ b/build.gradle
@@ -87,7 +87,7 @@ subprojects {
         protocPluginBaseName = 'protoc-gen-grpc-java'
         javaPluginPath = "$rootDir/compiler/build/exe/java_plugin/$protocPluginBaseName$exeSuffix"
 
-        nettyVersion = '4.1.12.Final'
+        nettyVersion = '4.1.13.Final'
         guavaVersion = '19.0'
         protobufVersion = '3.3.1'
         protocVersion = '3.3.0' // TODO(carl-mastrangelo): set this from protobufVersion when versions align again