diff --git a/Gemfile.lock b/Gemfile.lock
index d18aa4d..bfc3c3a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -51,7 +51,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (1.0.1)
       concurrent-ruby (~> 1.0)
-    json (2.1.0)
+    json (2.3.1)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)