diff --git a/Gemfile.lock b/Gemfile.lock
index 3d8f204..04a02a6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,10 +8,8 @@ GEM
       git (>= 1.2.5)
       rake
       rdoc
-    json (1.7.7)
     rake (10.0.3)
-    rdoc (3.12.1)
-      json (~> 1.4)
+    rdoc (6.3.2)
     rspec (3.4.0)
       rspec-core (~> 3.4.0)
       rspec-expectations (~> 3.4.0)