Upgrades Log4j to version 2.13.3
diff --git a/pom.xml b/pom.xml
index bf8862e..0f60ac5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -43,7 +43,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <struts2.version>2.5.22</struts2.version>
-        <log4j2.version>2.12.1</log4j2.version>
+        <log4j2.version>2.13.3</log4j2.version>
         <jetty-plugin.version>9.4.22.v20191022</jetty-plugin.version>
     </properties>