diff --git a/Gemfile.lock b/Gemfile.lock
index 7b8c93b..14498ea 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
     docile (1.1.5)
     httparty (0.15.6)
       multi_xml (>= 0.5.2)
-    json (2.1.0)
+    json (2.3.1)
     metaclass (0.0.4)
     minitest (5.11.3)
     mocha (1.3.0)