diff --git a/Gemfile.lock b/Gemfile.lock
index 436722a..352553a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
     httpclient (2.8.3)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    json (2.2.0)
+    json (2.3.1)
     method_source (0.9.2)
     minitest (5.11.3)
     multi_json (1.13.1)