diff --git a/servlet/pom.xml b/servlet/pom.xml
old mode 100755
new mode 100644
index 5af2bbc..a7bd068
--- a/servlet/pom.xml
+++ b/servlet/pom.xml
@@ -19,7 +19,7 @@
         <dependency>
             <groupId>org.apache.tomcat</groupId>
             <artifactId>tomcat-catalina</artifactId>
-            <version>8.0.37</version>
+            <version>8.5.9</version>
         </dependency>
 
     </dependencies>