diff --git a/Gemfile.lock b/Gemfile.lock
index 6695f5b..aa9e0c2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -55,7 +55,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.3)
+    json (2.3.1)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     mail (2.6.3)