diff --git a/appengine-java11/guestbook-cloud-firestore/pom.xml b/appengine-java11/guestbook-cloud-firestore/pom.xml
index b1c5afc3ed3..31be1028e14 100644
--- a/appengine-java11/guestbook-cloud-firestore/pom.xml
+++ b/appengine-java11/guestbook-cloud-firestore/pom.xml
@@ -72,7 +72,7 @@
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>28.2-jre</version>
+      <version>32.0.0-jre</version>
     </dependency>
 
     <dependency>