diff --git a/Gemfile.lock b/Gemfile.lock
index 5b44d7c0c..3bec5cd69 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -596,7 +596,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rdoc (6.7.0)
+    rdoc (6.8.0)
       psych (>= 4.0.0)
     recursive-open-struct (1.3.1)
       ostruct