diff --git a/Gemfile.lock b/Gemfile.lock
index 49b2868..7b6b33b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -47,7 +47,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     rake (10.5.0)
-    rdoc (6.1.1)
+    rdoc (6.3.2)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)