diff --git a/build.gradle b/build.gradle
index 704c304..ddba0c1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,7 +24,7 @@ subprojects {
         shadowVersion = '8.1.1'
 
         //IMPORTANT: This must be in sync with the shaded netty version in gRPC
-        nettyVersion = '4.2.0.Final'
+        nettyVersion = '4.2.1.Final'
     }
 
     apply plugin: 'java-library'