diff --git a/samples/client/petstore/retrofit/pom.xml b/samples/client/petstore/retrofit/pom.xml
index 45463b449bd..160b8e068ef 100644
--- a/samples/client/petstore/retrofit/pom.xml
+++ b/samples/client/petstore/retrofit/pom.xml
@@ -135,7 +135,7 @@
   </dependencies>
   <properties>
     <swagger-annotations-version>1.5.0</swagger-annotations-version>
-    <gson-version>2.3.1</gson-version>
+    <gson-version>2.8.9</gson-version>
     <retrofit-version>1.9.0</retrofit-version>
     <maven-plugin-version>1.0.0</maven-plugin-version>
     <junit-version>4.12</junit-version>