diff --git a/README.md b/README.md
index 271a01650..91c4c02f5 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ The project is currently alpha. While no breaking API changes are currently plan
 
 ### Overview
 
-This operator runs a Zookeeper 3.6.1 cluster, and uses Zookeeper dynamic reconfiguration to handle node membership.
+This operator runs a Zookeeper 3.6.3 cluster, and uses Zookeeper dynamic reconfiguration to handle node membership.
 
 The operator itself is built with the [Operator framework](https://github.com/operator-framework/operator-sdk).