diff --git a/reactive/pom.xml b/reactive/pom.xml
index f0b4763ec5..9267774555 100644
--- a/reactive/pom.xml
+++ b/reactive/pom.xml
@@ -28,7 +28,7 @@
 
   <properties>
     <main.basedir>${project.basedir}/..</main.basedir>
-    <reactor.version>3.4.19</reactor.version>
+    <reactor.version>3.4.21</reactor.version>
     <reactive.streams.version>1.0.4</reactive.streams.version>
     <reactivex.version>2.2.21</reactivex.version>
   </properties>