diff --git a/frameworks/Ruby/sinatra-sequel/Gemfile.lock b/frameworks/Ruby/sinatra-sequel/Gemfile.lock
index 27bc79c00d6..4f084bcd3b9 100644
--- a/frameworks/Ruby/sinatra-sequel/Gemfile.lock
+++ b/frameworks/Ruby/sinatra-sequel/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     base64 (0.2.0)
     bigdecimal (3.1.8)
     iodine (0.7.58)
-    json (2.8.2)
+    json (2.9.1)
     kgio (2.11.4)
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
diff --git a/frameworks/Ruby/sinatra-sequel/hello_world.rb b/frameworks/Ruby/sinatra-sequel/hello_world.rb
index 822ceb5979c..5a4630585f9 100644
--- a/frameworks/Ruby/sinatra-sequel/hello_world.rb
+++ b/frameworks/Ruby/sinatra-sequel/hello_world.rb
@@ -22,7 +22,7 @@ def bounded_queries
 
     def json(data)
       content_type :json
-      JSON.fast_generate(data)
+      data.to_json
     end
 
     # Return a random number between 1 and MAX_PK
diff --git a/frameworks/Ruby/sinatra/hello_world.rb b/frameworks/Ruby/sinatra/hello_world.rb
index dad43a41c20..1a6b2c55c4c 100644
--- a/frameworks/Ruby/sinatra/hello_world.rb
+++ b/frameworks/Ruby/sinatra/hello_world.rb
@@ -22,7 +22,7 @@ def bounded_queries
 
     def json(data)
       content_type :json
-      JSON.fast_generate(data)
+      data.to_json
     end
 
     # Return a random number between 1 and MAX_PK