diff --git a/appengine/pusher-chat/pom.xml b/appengine/pusher-chat/pom.xml
index 285c8625273..56ce5913b23 100644
--- a/appengine/pusher-chat/pom.xml
+++ b/appengine/pusher-chat/pom.xml
@@ -46,7 +46,7 @@ Copyright 2017 Google Inc.
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
-      <version>2.8.8</version>
+      <version>2.9.0.pr4</version>
     </dependency>
     <dependency>
       <groupId>javax.servlet</groupId>