diff --git a/ethereum/source/java-demo/pom.xml b/ethereum/source/java-demo/pom.xml
index 3102a77..5617de8 100644
--- a/ethereum/source/java-demo/pom.xml
+++ b/ethereum/source/java-demo/pom.xml
@@ -59,7 +59,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.3</version>
+            <version>2.8.9</version>
         </dependency>
 
         <!-- web3j -->