diff --git a/Gemfile.lock b/Gemfile.lock
index 5435498..14f9389 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,7 +21,7 @@ GEM
     concurrent-ruby (1.0.2)
     docile (1.1.5)
     i18n (0.7.0)
-    json (2.0.2)
+    json (2.3.1)
     method_source (0.8.2)
     minitest (5.9.0)
     parser (2.3.1.2)