diff --git a/Gemfile.lock b/Gemfile.lock
index c445de2..4e0aab7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     nio4r (2.5.2)
     puma (4.3.1)
       nio4r (~> 2.0)
-    rack (2.2.2)
+    rack (2.2.6.4)
     rack-protection (2.0.8.1)
       rack
     ruby2_keywords (0.0.2)