fix log4j error (#85)

diff --git a/pom.xml b/pom.xml
index 771e807..7a9623a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,7 +57,7 @@
         <top.level.dir>${project.basedir}/..</top.level.dir>
         <compiler.source>1.8</compiler.source>
         <compiler.target>1.8</compiler.target>
-        <log4j2.version>2.13.3</log4j2.version>
+        <log4j2.version>2.16.0</log4j2.version>
         <commons.configuration.version>1.10</commons.configuration.version>
         <commons.configuration2.version>2.1.1</commons.configuration2.version>
         <commons.collections.version>3.2.2</commons.collections.version>