diff --git a/Gemfile b/Gemfile
index a95ac24..b2da713 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ group :test do
   # gem 'json', '~> 1.7', :platforms => [:jruby] look TODO needed?
   gem 'minitest', '~> 5.25.4'
   gem 'mocha', '~> 2.7.1'
-  gem 'rack', '~> 3.1.8'
+  gem 'rack', '~> 3.1.9'
   gem 'netrc', '~> 0.11.0'
   gem 'rack-test', '~> 2'
   gem 'simplecov', '~> 0.22.0', :require => false
diff --git a/Gemfile.lock b/Gemfile.lock
index 8073159..439d3b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,7 @@ GEM
     multipart-post (2.4.1)
     netrc (0.11.0)
     public_suffix (5.0.1)
-    rack (3.1.8)
+    rack (3.1.9)
     rack-test (2.2.0)
       rack (>= 1.3)
     rake (13.2.1)
@@ -68,7 +68,7 @@ DEPENDENCIES
   minitest (~> 5.25.4)
   mocha (~> 2.7.1)
   netrc (~> 0.11.0)
-  rack (~> 3.1.8)
+  rack (~> 3.1.9)
   rack-test (~> 2)
   rake (~> 13.2.1)
   redcarpet (~> 3.6.0)