diff --git a/chapter-11/pom.xml b/chapter-11/pom.xml
index 2f3da16..fbeb931 100644
--- a/chapter-11/pom.xml
+++ b/chapter-11/pom.xml
@@ -53,7 +53,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>2.8.9</version>
         </dependency>
 
         <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-mllib -->