diff --git a/Gemfile.lock b/Gemfile.lock
index 6b56943..dd93f92 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -254,7 +254,7 @@ GEM
     pry-byebug (3.0.0)
       byebug (~> 3.4)
       pry (~> 0.10)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.2)