Remove json gem dependency

All modern Rubies ship JSON as part of stdlib.  Using the gem actually hurts multi-platform support due to build difficulties on Windows.

1 files changed, 0 insertions, 1 deletions

diff --git a/Gemfile b/Gemfile
index 78f9853bed..ba102fe711 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