diff --git a/build.sbt b/build.sbt
index f9493cc..2817ffc 100644
--- a/build.sbt
+++ b/build.sbt
@@ -54,7 +54,7 @@ lazy val root = (project in file(".")).
 
     libraryDependencies += "junit" % "junit" % "4.12" % "test",
 
-    libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.8.1" % "test",
+    libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.9" % "test",
 
     libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % "test",