diff --git a/chapter6/chapter6-1/pom.xml b/chapter6/chapter6-1/pom.xml
index e0bf8a9..ae1376a 100644
--- a/chapter6/chapter6-1/pom.xml
+++ b/chapter6/chapter6-1/pom.xml
@@ -60,7 +60,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.5</version>
+            <version>2.8.9</version>
         </dependency>
 
         <dependency>