diff --git a/Gemfile.lock b/Gemfile.lock
index 6835bcf..59563a7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,7 +149,7 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     msgpack (1.3.1)
-    nio4r (2.5.1)
+    nio4r (2.5.5)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)