diff --git a/Gemfile b/Gemfile
index 78f9853bed19e4a0bcac86080db9488ba764ad98..ba102fe711f4b2075659b4640d5a7f92d2426cac 100644
--- a/Gemfile
+++ b/Gemfile
@@ -103,7 +103,6 @@ platforms :ruby, :mswin, :mswin64, :mingw, :x64_mingw do
 end
 
 platforms :jruby do
-  gem 'json'
   if ENV['AR_JDBC']
     gem 'activerecord-jdbcsqlite3-adapter', github: 'jruby/activerecord-jdbc-adapter', branch: 'master'
     group :db do
diff --git a/Gemfile.lock b/Gemfile.lock
index bd2e2c30b98b0e116984ff3421bbd70c8470b78c..249028d697e195b245f369b56669bec000a12213 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -64,7 +64,6 @@ PATH
     activesupport (5.0.0.beta2)
       concurrent-ruby (~> 1.0)
       i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
       method_source
       minitest (~> 5.1)
       tzinfo (~> 1.1)
@@ -287,7 +286,6 @@ DEPENDENCIES
   faye-websocket
   hiredis
   jquery-rails
-  json
   kindlerb (= 0.1.1)
   listen (~> 3.0.5)
   minitest (< 5.3.4)
diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index 32e28c0212c7b5967a1172963b516874454fb6b8..3b71858350215e336b07ee536f0f973892ea36c3 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -21,7 +21,6 @@
   s.rdoc_options.concat ['--encoding',  'UTF-8']
 
   s.add_dependency 'i18n',       '~> 0.7'
-  s.add_dependency 'json',       '~> 1.7', '>= 1.7.7'
   s.add_dependency 'tzinfo',     '~> 1.1'
   s.add_dependency 'minitest',   '~> 5.1'
   s.add_dependency 'concurrent-ruby', '~> 1.0'