diff --git a/Gemfile.lock b/Gemfile.lock
index ae081e9..a509925 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     docile (1.1.5)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    json (2.1.0)
+    json (2.3.1)
     method_source (0.9.0)
     minitest (5.11.3)
     pry (0.11.1)