diff --git a/Gemfile b/Gemfile
index f0ef52eb3..9e49cdc29 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rack-jekyll'
 
 gem 'certified'
 gem 'rake'
-gem 'rack', '~> 1.4.1'
+gem 'rack', '~> 1.6.13'
 gem 'jekyll', '~> 0.11.2'
 gem 'rdiscount', '~> 1.6.8'
 gem 'RedCloth', '~> 4.2.9'
diff --git a/Gemfile.lock b/Gemfile.lock
index c99e8223b..eff5e9bb7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,7 +33,7 @@ GEM
     posix-spawn (0.3.11)
     puma (2.11.2)
       rack (>= 1.1, < 2.0)
-    rack (1.4.5)
+    rack (1.6.13)
     rack-jekyll (0.3.5)
       jekyll
       rack
@@ -67,7 +67,7 @@ DEPENDENCIES
   nokogiri
   pdfkit
   puma
-  rack (~> 1.4.1)
+  rack (~> 1.6.13)
   rack-jekyll
   rake
   rdiscount (~> 1.6.8)