diff --git a/Gemfile.lock b/Gemfile.lock
index ae10034..1127d1f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,10 +11,8 @@ GEM
     ffi (1.9.14)
     ffi-mmap (0.2.0)
       ffi
-    json (1.8.3)
     rake (10.4.2)
-    rdoc (4.2.2)
-      json (~> 1.4)
+    rdoc (6.3.2)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)
       rspec-expectations (~> 3.5.0)