diff --git a/demo/Gemfile.lock b/demo/Gemfile.lock
index 1728f4b..5a4a0d0 100644
--- a/demo/Gemfile.lock
+++ b/demo/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     haml (4.0.2)
       tilt
     hike (1.2.2)
-    json (1.7.7)
+    json (2.3.0)
     multi_json (1.7.3)
     rack (1.5.2)
     rack-protection (1.5.0)