diff --git a/chronicle-playground/pom.xml b/chronicle-playground/pom.xml
old mode 100755
new mode 100644
index fbcde97..7bfce32
--- a/chronicle-playground/pom.xml
+++ b/chronicle-playground/pom.xml
@@ -16,7 +16,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>3.8.1</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>