diff --git a/Gemfile.lock b/Gemfile.lock
index e1f3ff5..927f740 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
       multi_xml (>= 0.5.2)
     i18n (1.5.3)
       concurrent-ruby (~> 1.0)
-    json (2.1.0)
+    json (2.3.1)
     mechanize (2.7.6)
       domain_name (~> 0.5, >= 0.5.1)
       http-cookie (~> 1.0)