diff --git a/Gemfile b/Gemfile
index e679223..53b1667 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source "https://rubygems.org"
 
-gem 'rack', '~> 2.0.8'
+gem 'rack', '~> 2.1.4'
 gem 'activerecord'
 gem 'mysql2'
diff --git a/Gemfile.lock b/Gemfile.lock
index c096169..b821ccb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
       concurrent-ruby (~> 1.0)
     minitest (5.13.0)
     mysql2 (0.5.3)
-    rack (2.0.8)
+    rack (2.1.4)
     thread_safe (0.3.6)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
@@ -29,7 +29,7 @@ PLATFORMS
 DEPENDENCIES
   activerecord
   mysql2
-  rack (~> 2.0.8)
+  rack (~> 2.1.4)
 
 BUNDLED WITH
    2.0.2