diff --git a/Gemfile b/Gemfile
index fa54e9b..20a3212 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,7 +26,7 @@ gem('nokogiri', '1.13.4')
 gem('parallel', '1.19.1')
 gem('pry')
 gem('public_suffix', '4.0.5')
-gem('rack', '2.2.3')
+gem('rack', '2.2.6.4')
 gem('rack-test')
 gem('rake')
 gem('redis', '4.1.4')
diff --git a/Gemfile.lock b/Gemfile.lock
index baf1d6b..30a3be9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,7 +149,7 @@ GEM
     public_suffix (4.0.5)
     raabro (1.4.0)
     racc (1.6.2)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-protection (2.2.4)
       rack
     rack-test (2.1.0)
@@ -272,7 +272,7 @@ DEPENDENCIES
   parallel (= 1.19.1)
   pry
   public_suffix (= 4.0.5)
-  rack (= 2.2.3)
+  rack (= 2.2.6.4)
   rack-test
   rake
   redis (= 4.1.4)