diff --git a/Gemfile.lock b/Gemfile.lock
index 920b91a..b74ae77 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -59,8 +59,7 @@ GEM
       rack (~> 1.2)
     rack (1.5.2)
     rake (10.3.2)
-    rdoc (4.1.2)
-      json (~> 1.4)
+    rdoc (6.3.2)
     rest-client (1.7.2)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)