diff --git a/Gemfile.lock b/Gemfile.lock
index 777365d..cdbb580 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     nio4r (2.5.2)
     puma (4.3.3)
       nio4r (~> 2.0)
-    rack (2.2.2)
+    rack (2.2.6.4)
     rack-protection (2.0.8.1)
       rack
     ruby2_keywords (0.0.2)