diff --git a/Gemfile b/Gemfile
index 170abd4..bc291b3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -33,7 +33,7 @@ gem 'kramdown'
 gem 'liquid'
 gem 'listen'
 gem 'mercenary'
-gem 'rack', '~> 3.1.7'
+gem 'rack', '~> 3.1.8'
 gem 'railties', '>= 5.2.2.1'
 gem 'rouge'
 gem 'rubocop'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7ae8ee5..8e4c021 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -225,7 +225,7 @@ GEM
       stringio
     public_suffix (6.0.1)
     racc (1.8.1)
-    rack (3.1.7)
+    rack (3.1.8)
     rack-session (2.0.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)
@@ -340,7 +340,7 @@ DEPENDENCIES
   mini_racer (~> 0.15.0)
   minima!
   nokogiri (>= 1.10.4)
-  rack (~> 3.1.7)
+  rack (~> 3.1.8)
   railties (>= 5.2.2.1)
   rouge
   rubocop