diff --git a/Gemfile.lock b/Gemfile.lock
index 2a901ceba2..a6620b59bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,7 @@ GEM
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
     io-event (1.7.3)
-    json (2.7.5)
+    json (2.8.1)
     kramdown (2.4.0)
       rexml
     listen (3.9.0)