update commons-lang
diff --git a/pom.xml b/pom.xml
index e3a43c0..cea122f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -254,7 +254,7 @@
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
-      <version>3.6</version>
+      <version>3.8.1</version>
     </dependency>
 
     <dependency>