diff --git a/Gemfile b/Gemfile
index 7558f1a4..ebfb8f9c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ group :development do
   gem 'puma',               '~> 6.1.0'
   gem 'haml',               '~> 5.2.0'
 
-  gem 'rack', '~> 2.2.3.1'
+  gem 'rack', '~> 2.2.6.4'
   gem 'rack-mini-profiler', '~> 0.10.1'
   gem 'flamegraph'
   gem 'stackprof' # ruby 2.1+ only
diff --git a/Gemfile.lock b/Gemfile.lock
index f5513842..ca6bb40d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,7 +123,7 @@ GEM
     puma (6.1.0)
       nio4r (~> 2.0)
     racc (1.6.2)
-    rack (2.2.3.1)
+    rack (2.2.6.4)
     rack-cache (1.13.0)
       rack (>= 0.4)
     rack-mini-profiler (0.10.7)
@@ -186,7 +186,7 @@ DEPENDENCIES
   mongo (~> 2.18.2)
   origin (~> 2.3.1)
   puma (~> 6.1.0)
-  rack (~> 2.2.3.1)
+  rack (~> 2.2.6.4)
   rack-mini-profiler (~> 0.10.1)
   rack-test (~> 0.8.2)
   rake