diff --git a/Gemfile.lock b/Gemfile.lock
index 8173116..f5444d5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -41,7 +41,7 @@ GEM
     hashdiff (0.3.7)
     i18n (1.0.0)
       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)