diff --git a/hw15-messageSystem/pom.xml b/hw15-messageSystem/pom.xml
index b87cc03..0230f0a 100644
--- a/hw15-messageSystem/pom.xml
+++ b/hw15-messageSystem/pom.xml
@@ -29,7 +29,7 @@
     <assertj-core.version>3.14.0</assertj-core.version>
     <freemarker.version>2.3.28</freemarker.version>
     <jetty.version>9.4.26.v20200117</jetty.version>
-    <gson.version>2.8.5</gson.version>
+    <gson.version>2.8.9</gson.version>
     <spring.version>5.1.5.RELEASE</spring.version>
     <thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
     <slf4j-api.version>1.7.25</slf4j-api.version>