diff --git a/checkstyle/project.xml b/checkstyle/project.xml
index 263ca5cd..5421e6d6 100644
--- a/checkstyle/project.xml
+++ b/checkstyle/project.xml
@@ -147,7 +147,7 @@
     <dependency>
       <groupId>checkstyle</groupId>
       <artifactId>checkstyle</artifactId>
-      <version>4.0-beta5</version>
+      <version>4.0-beta6</version>
       <properties>
         <classloader>root</classloader>
       </properties>
@@ -155,7 +155,7 @@
     <dependency>
       <groupId>checkstyle</groupId>
       <artifactId>checkstyle-optional</artifactId>
-      <version>4.0-beta5</version>
+      <version>4.0-beta6</version>
       <properties>
         <classloader>root</classloader>
       </properties>