diff --git a/ChangeLog b/ChangeLog
index 759aa06e44..888a5eaa1b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+Sun Dec  6 08:39:05 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* ext/json/json.gemspec: bump version to json 1.8.3. CRuby already contained
+	  upstream changes.
+
+	  https://github.com/ruby/ruby/commit/4d059bf9f5f10f3d3088de49fc87e5555db7770d
+	  https://github.com/flori/json/commit/d4c99de78905d96c3f301f48b2c789943bb3f098
+
+	* ext/json/lib/json/version.rb: ditto.
+
 Sat Dec  5 17:48:25 2015  Lars Kanis  <lars@greiz-reinsdorf.de>
 
 	* tool/fake.rb: Fix cross build when srcdir is an absolute path.
diff --git a/ext/json/json.gemspec b/ext/json/json.gemspec
index d756dd78ed..9fb6fa155a 100644
--- a/ext/json/json.gemspec
+++ b/ext/json/json.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name = "json"
-  s.version = "1.8.2"
+  s.version = "1.8.3"
   s.summary = "This json is bundled with Ruby"
   s.executables = []
   s.files = ["json.rb", "json/add/bigdecimal.rb", "json/add/complex.rb", "json/add/core.rb", "json/add/date.rb", "json/add/date_time.rb", "json/add/exception.rb", "json/add/ostruct.rb", "json/add/range.rb", "json/add/rational.rb", "json/add/regexp.rb", "json/add/struct.rb", "json/add/symbol.rb", "json/add/time.rb", "json/common.rb", "json/ext.rb", "json/ext/generator.bundle", "json/ext/parser.bundle", "json/generic_object.rb", "json/version.rb"]
diff --git a/ext/json/lib/json/version.rb b/ext/json/lib/json/version.rb
index 4549f5f213..5a4013dbf6 100644
--- a/ext/json/lib/json/version.rb
+++ b/ext/json/lib/json/version.rb
@@ -1,6 +1,6 @@
 module JSON
   # JSON version
-  VERSION         = '1.8.2'
+  VERSION         = '1.8.3'
   VERSION_ARRAY   = VERSION.split(/\./).map { |x| x.to_i } # :nodoc:
   VERSION_MAJOR   = VERSION_ARRAY[0] # :nodoc:
   VERSION_MINOR   = VERSION_ARRAY[1] # :nodoc: