diff --git a/Gemfile.lock b/Gemfile.lock
index 695aaec..6e4b649 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,7 +40,7 @@ GEM
       rack (~> 1.2)
     rack (1.6.4)
     rake (10.4.2)
-    rdoc (4.2.0)
+    rdoc (6.3.2)
     redis (3.2.1)
     rspec (3.3.0)
       rspec-core (~> 3.3.0)