diff --git a/Gemfile b/Gemfile
index b670e7b84..7c7588aae 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,5 +2,5 @@ source "https://rubygems.org"
 
 gem 'github-pages'
 gem 'html-proofer'
-gem 'rack-contrib', '~> 1.1.0'
+gem 'rack-contrib', '~> 2.5.0'
 gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
index cd79501ce..7c01f1964 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -117,9 +117,9 @@ GEM
       sawyer (~> 0.7.0, >= 0.5.3)
     parallel (1.8.0)
     public_suffix (1.5.3)
-    rack (1.5.2)
-    rack-contrib (1.1.0)
-      rack (>= 0.9.1)
+    rack (3.0.11)
+    rack-contrib (2.5.0)
+      rack (< 4)
     rake (10.3.2)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
@@ -146,8 +146,8 @@ PLATFORMS
 DEPENDENCIES
   github-pages
   html-proofer
-  rack-contrib (~> 1.1.0)
+  rack-contrib (~> 2.5.0)
   rake
 
 BUNDLED WITH
-   1.12.0
+   1.17.3