diff --git a/Gemfile.lock b/Gemfile.lock
index 8ab9d9c..8787fcb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -84,7 +84,8 @@ GEM
       rdoc (~> 3.4)
       thor (~> 0.14.4)
     rake (0.8.7)
-    rdoc (3.6.1)
+    rdoc (3.12.2)
+      json (~> 1.4)
     thin (1.2.11)
       daemons (>= 1.0.9)
       eventmachine (>= 0.12.6)