diff --git a/spring-vault-dependencies/pom.xml b/spring-vault-dependencies/pom.xml
index b83d0415..4815396a 100644
--- a/spring-vault-dependencies/pom.xml
+++ b/spring-vault-dependencies/pom.xml
@@ -59,7 +59,7 @@
 	<properties>
 		<httpclient.version>4.5.5</httpclient.version>
 		<httpcore.version>4.4.9</httpcore.version>
-		<netty.version>4.1.20.Final</netty.version>
+		<netty.version>4.1.21.Final</netty.version>
 		<okhttp3.version>3.9.1</okhttp3.version>
 		<jackson.version>2.9.4</jackson.version>
 	</properties>