diff --git a/appengine/pom.xml b/appengine/pom.xml
index 7b07fc6..32eb364 100644
--- a/appengine/pom.xml
+++ b/appengine/pom.xml
@@ -51,7 +51,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.2.4</version>
+            <version>2.8.9</version>
         </dependency>
         <dependency>
             <groupId>com.google.inject.extensions</groupId>