diff --git a/Gemfile.lock b/Gemfile.lock
index 95091b8..cd5a66d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -175,7 +175,7 @@ GEM
     multi_test (0.1.2)
     mysql2 (0.5.1)
     nenv (0.3.0)
-    nio4r (2.3.0)
+    nio4r (2.3.1)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)