diff --git a/example/animal-service/Gemfile b/example/animal-service/Gemfile
index 48883fc..7b2478c 100644
--- a/example/animal-service/Gemfile
+++ b/example/animal-service/Gemfile
@@ -8,7 +8,7 @@ end
 
 gem 'rake'
 gem 'rack', '~>1.5.2'
-gem 'json', '~>1.6'
+gem 'json', '~>2.0'
 gem 'sqlite3'
 gem 'sequel'
 gem 'sinatra'
diff --git a/example/zoo-app/Gemfile b/example/zoo-app/Gemfile
index c82d6fc..73d95f9 100644
--- a/example/zoo-app/Gemfile
+++ b/example/zoo-app/Gemfile
@@ -8,5 +8,5 @@ end
 
 gem 'rake'
 gem 'rack', '~>1.5.2'
-gem 'json', '~>1.6.8'
+gem 'json', '~>1.8.0'
 gem 'httparty'