diff --git a/Gemfile.lock b/Gemfile.lock
index cb90229..9b4745d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
       multi_xml (>= 0.5.2)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    json (2.2.0)
+    json (2.3.1)
     kramdown (1.17.0)
     method_source (0.9.2)
     mime-types (3.3)