diff --git a/example/animal-service/Gemfile b/example/animal-service/Gemfile
index 48883fc..485d5de 100644
--- a/example/animal-service/Gemfile
+++ b/example/animal-service/Gemfile
@@ -7,7 +7,7 @@ group :development, :test do
 end
 
 gem 'rake'
-gem 'rack', '~>1.5.2'
+gem 'rack', '~>1.6.0'
 gem 'json', '~>1.6'
 gem 'sqlite3'
 gem 'sequel'
diff --git a/example/zoo-app/Gemfile b/example/zoo-app/Gemfile
index c82d6fc..0c558e8 100644
--- a/example/zoo-app/Gemfile
+++ b/example/zoo-app/Gemfile
@@ -7,6 +7,6 @@ group :development, :test do
 end
 
 gem 'rake'
-gem 'rack', '~>1.5.2'
+gem 'rack', '~>1.6.0'
 gem 'json', '~>1.6.8'
 gem 'httparty'