diff --git a/Gemfile.lock b/Gemfile.lock
index e83ec406..00c702d4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -300,8 +300,7 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rake (10.4.2)
     rbtree (0.4.2)
-    rdoc (4.1.1)
-      json (~> 1.4)
+    rdoc (6.3.2)
     redis (3.0.7)
     redis-actionpack (4.0.0)
       actionpack (~> 4)