diff --git a/Gemfile.lock b/Gemfile.lock
index 6e90d8c..07e1491 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -175,7 +175,7 @@ GEM
     multi_test (0.1.2)
     mysql2 (0.4.10)
     nenv (0.3.0)
-    nio4r (2.1.0)
+    nio4r (2.2.0)
     nokogiri (1.8.1)
       mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)