diff --git a/Gemfile.lock b/Gemfile.lock
index ff670b2..4896162 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -93,7 +93,7 @@ GEM
     minitest (5.11.3)
     msgpack (1.2.4)
     nio4r (2.3.0)
-    nokogiri (1.8.2)
+    nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     pg (1.0.0)
     promise.rb (0.7.4)