diff --git a/Gemfile.lock b/Gemfile.lock
index 11233ef..8eb7c91 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
       multipart-post (>= 1.2, < 3)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
-    json (2.1.0)
+    json (2.3.1)
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)