diff --git a/20172018/servlet_usage/pom.xml b/20172018/servlet_usage/pom.xml
index c84261a..3991ad5 100644
--- a/20172018/servlet_usage/pom.xml
+++ b/20172018/servlet_usage/pom.xml
@@ -8,7 +8,7 @@
 	<name>servlet usage example code</name>
 	<url>http://maven.apache.org</url>
 	<properties>
-		<tomcat.version>8.5.2</tomcat.version>
+		<tomcat.version>8.5.61</tomcat.version>
 	</properties>
 	<dependencies>
 		<dependency>