update junit (#2)

diff --git a/pom.xml b/pom.xml
index bb8c4be..1a9d33b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -170,7 +170,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.8.2</version>
+      <version>4.13</version>
       <scope>test</scope>
     </dependency>
     <dependency>