diff --git a/Gemfile.lock b/Gemfile.lock
index f347186..3baa1e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.6)
+    json (2.3.1)
     kgio (2.11.3)
     koala (3.0.0)
       addressable