diff --git a/lib/cocoa/src/Thrift.h b/lib/cocoa/src/Thrift.h
index 6fc594a..502ba17 100644
--- a/lib/cocoa/src/Thrift.h
+++ b/lib/cocoa/src/Thrift.h
@@ -17,4 +17,4 @@
  * under the License.
  */
 
-#define ThriftVersion @"1.0.0-dev"
+#define ThriftVersion @"0.12.0"
diff --git a/lib/csharp/ThriftMSBuildTask/Properties/AssemblyInfo.cs b/lib/csharp/ThriftMSBuildTask/Properties/AssemblyInfo.cs
index 974cf27..19abcf7 100644
--- a/lib/csharp/ThriftMSBuildTask/Properties/AssemblyInfo.cs
+++ b/lib/csharp/ThriftMSBuildTask/Properties/AssemblyInfo.cs
@@ -56,5 +56,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.11.0.*")]
-[assembly: AssemblyFileVersion("0.11.0.*")]
+[assembly: AssemblyVersion("0.12.0.*")]
+[assembly: AssemblyFileVersion("0.12.0.*")]
diff --git a/lib/csharp/ThriftMSBuildTask/ThriftMSBuildTask.csproj b/lib/csharp/ThriftMSBuildTask/ThriftMSBuildTask.csproj
index ae86081..68427c3 100644
--- a/lib/csharp/ThriftMSBuildTask/ThriftMSBuildTask.csproj
+++ b/lib/csharp/ThriftMSBuildTask/ThriftMSBuildTask.csproj
@@ -45,7 +45,7 @@
     <UpdateRequired>false</UpdateRequired>
     <MapFileExtensions>true</MapFileExtensions>
     <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.0.%2a</ApplicationVersion>
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
@@ -115,4 +115,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lib/csharp/src/Properties/AssemblyInfo.cs b/lib/csharp/src/Properties/AssemblyInfo.cs
index dcbe747..23fbc73 100644
--- a/lib/csharp/src/Properties/AssemblyInfo.cs
+++ b/lib/csharp/src/Properties/AssemblyInfo.cs
@@ -51,5 +51,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.0.0.1")]
-[assembly: AssemblyFileVersion("1.0.0.1")]
+[assembly: AssemblyVersion("0.12.0.1")]
+[assembly: AssemblyFileVersion("0.12.0.1")]
diff --git a/lib/csharp/src/Thrift.csproj b/lib/csharp/src/Thrift.csproj
index 83bc4f7..ede152d 100644
--- a/lib/csharp/src/Thrift.csproj
+++ b/lib/csharp/src/Thrift.csproj
@@ -45,7 +45,7 @@
     <UpdateRequired>false</UpdateRequired>
     <MapFileExtensions>true</MapFileExtensions>
     <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.0.%2a</ApplicationVersion>
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
@@ -153,4 +153,4 @@
   <ProjectExtensions>
     <VisualStudio AllowExistingFolder="true" />
   </ProjectExtensions>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lib/csharp/test/Multiplex/Client/MultiplexClient.csproj b/lib/csharp/test/Multiplex/Client/MultiplexClient.csproj
index 6221e14..4df1cbc 100644
--- a/lib/csharp/test/Multiplex/Client/MultiplexClient.csproj
+++ b/lib/csharp/test/Multiplex/Client/MultiplexClient.csproj
@@ -46,7 +46,7 @@
     <UpdateRequired>false</UpdateRequired>
     <MapFileExtensions>true</MapFileExtensions>
     <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.0.%2a</ApplicationVersion>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>
@@ -145,4 +145,4 @@
 
 </PreBuildEvent>
   </PropertyGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lib/csharp/test/Multiplex/Client/Properties/AssemblyInfo.cs b/lib/csharp/test/Multiplex/Client/Properties/AssemblyInfo.cs
index f686ded..5ee34a1 100644
--- a/lib/csharp/test/Multiplex/Client/Properties/AssemblyInfo.cs
+++ b/lib/csharp/test/Multiplex/Client/Properties/AssemblyInfo.cs
@@ -51,5 +51,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyVersion("0.12.0.0")]
+[assembly: AssemblyFileVersion("0.12.0.0")]
diff --git a/lib/csharp/test/Multiplex/Server/MultiplexServer.csproj b/lib/csharp/test/Multiplex/Server/MultiplexServer.csproj
index dc1d123..57ef76d 100644
--- a/lib/csharp/test/Multiplex/Server/MultiplexServer.csproj
+++ b/lib/csharp/test/Multiplex/Server/MultiplexServer.csproj
@@ -46,7 +46,7 @@
     <UpdateRequired>false</UpdateRequired>
     <MapFileExtensions>true</MapFileExtensions>
     <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.0.%2a</ApplicationVersion>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>
@@ -145,4 +145,4 @@
 
 </PreBuildEvent>
   </PropertyGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/lib/csharp/test/Multiplex/Server/Properties/AssemblyInfo.cs b/lib/csharp/test/Multiplex/Server/Properties/AssemblyInfo.cs
index 5d40546..65fb4ce 100644
--- a/lib/csharp/test/Multiplex/Server/Properties/AssemblyInfo.cs
+++ b/lib/csharp/test/Multiplex/Server/Properties/AssemblyInfo.cs
@@ -51,5 +51,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyVersion("0.12.0.0")]
+[assembly: AssemblyFileVersion("0.12.0.0")]
diff --git a/lib/csharp/test/ThriftMVCTest/Properties/AssemblyInfo.cs b/lib/csharp/test/ThriftMVCTest/Properties/AssemblyInfo.cs
index 1b1b833..186257d 100644
--- a/lib/csharp/test/ThriftMVCTest/Properties/AssemblyInfo.cs
+++ b/lib/csharp/test/ThriftMVCTest/Properties/AssemblyInfo.cs
@@ -49,5 +49,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.0.0.1")]
-[assembly: AssemblyFileVersion("1.0.0.1")]
+[assembly: AssemblyVersion("0.12.0.0")]
+[assembly: AssemblyFileVersion("0.12.0.0")]
diff --git a/lib/d/src/thrift/base.d b/lib/d/src/thrift/base.d
index 38034a7..260e155 100644
--- a/lib/d/src/thrift/base.d
+++ b/lib/d/src/thrift/base.d
@@ -50,7 +50,7 @@
 /// The Thrift version string, used for informative purposes.
 // Note: This is currently hardcoded, but will likely be filled in by the build
 // system in future versions.
-enum VERSION = "1.0.0 dev";
+enum VERSION = "0.12.0";
 
 /**
  * Functions used for logging inside Thrift.
diff --git a/lib/dart/pubspec.yaml b/lib/dart/pubspec.yaml
index f7aa876..365b2cd 100644
--- a/lib/dart/pubspec.yaml
+++ b/lib/dart/pubspec.yaml
@@ -16,7 +16,7 @@
 # under the License.
 
 name: thrift
-version: 1.0.0-dev
+version: 0.12.0
 description: >
   A Dart library for Apache Thrift
 author: Apache Thrift Developers <dev@thrift.apache.org>
diff --git a/lib/delphi/src/Thrift.pas b/lib/delphi/src/Thrift.pas
index ddd4c11..8293d07 100644
--- a/lib/delphi/src/Thrift.pas
+++ b/lib/delphi/src/Thrift.pas
@@ -27,7 +27,7 @@
   Thrift.Protocol;
 
 const
-  Version = '1.0.0-dev';
+  Version = '0.12.0';
 
 type
   TException = Thrift.Exception.TException; // compatibility alias
diff --git a/lib/erl/src/thrift.app.src b/lib/erl/src/thrift.app.src
index 1a23f0d..b02ab21 100644
--- a/lib/erl/src/thrift.app.src
+++ b/lib/erl/src/thrift.app.src
@@ -22,7 +22,7 @@
   {description, "Thrift bindings"},
 
   % The version of the applicaton
-  {vsn, "1.0.0-dev"},
+  {vsn, "0.12.0"},
 
   % All modules used by the application.
   {modules, [
diff --git a/lib/go/thrift/serializer_types_test.go b/lib/go/thrift/serializer_types_test.go
index c8e3b3b..ef7cc3a 100644
--- a/lib/go/thrift/serializer_types_test.go
+++ b/lib/go/thrift/serializer_types_test.go
@@ -19,7 +19,7 @@
 
 package thrift
 
-// Autogenerated by Thrift Compiler (1.0.0-dev)
+// Autogenerated by Thrift Compiler (0.12.0)
 // DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
 
 /* THE FOLLOWING THRIFT FILE WAS USED TO CREATE THIS
diff --git a/lib/haxe/README.md b/lib/haxe/README.md
index 19bbbaa..02e6919 100644
--- a/lib/haxe/README.md
+++ b/lib/haxe/README.md
@@ -71,8 +71,8 @@
 
 - To set up any **stable version**, choose the appropriate branch (e.g. `0.10.0`):
 
-    - `haxelib git thrift https://git.apache.org/thrift.git 0.10.0 lib/haxe`
-    - `haxelib git thrift https://github.com/apache/thrift.git 0.10.0 lib/haxe`
+    - `haxelib git thrift https://git.apache.org/thrift.git 0.12.0 lib/haxe`
+    - `haxelib git thrift https://github.com/apache/thrift.git 0.12.0 lib/haxe`
 
 - To set up the current **development version**, use the `master` branch:
   
diff --git a/lib/haxe/haxelib.json b/lib/haxe/haxelib.json
index f76990e..8d1bb11 100644
--- a/lib/haxe/haxelib.json
+++ b/lib/haxe/haxelib.json
@@ -4,7 +4,7 @@
 	"license": "Apache",
 	"tags": ["thrift", "rpc", "serialization", "cross", "framework"],
 	"description": "Haxe bindings for the Apache Thrift RPC and serialization framework",
-	"version": "1.0.0-dev",
+	"version": "0.12.0",
 	"releasenote": "Licensed under Apache License, Version 2.0. The Apache Thrift compiler needs to be installed separately.",
 	"contributors": ["Apache Software Foundation (ASF)"],
 	"dependencies": { },
diff --git a/lib/hs/thrift.cabal b/lib/hs/thrift.cabal
index a907d78..c136480 100644
--- a/lib/hs/thrift.cabal
+++ b/lib/hs/thrift.cabal
@@ -18,7 +18,7 @@
 --
 
 Name:           thrift
-Version:        0.99.0
+Version:        0.12.0
 Cabal-Version:  1.24
 License:        OtherLicense
 Category:       Foreign
diff --git a/lib/java/gradle.properties b/lib/java/gradle.properties
index e99788f..4955b4c 100644
--- a/lib/java/gradle.properties
+++ b/lib/java/gradle.properties
@@ -1,9 +1,9 @@
 # This file is shared currently between this Gradle build and the
 # Ant builds for fd303 and JavaScript. Keep the dotted notation for
 # the properties to minimize the changes in the dependencies.
-thrift.version=1.0.0
+thrift.version=0.12.0
 thrift.groupid=org.apache.thrift
-release=false
+release=true
 
 # Local Install paths
 install.path=/usr/local/lib
diff --git a/lib/js/package.json b/lib/js/package.json
index a59cdc4..2ddd238 100644
--- a/lib/js/package.json
+++ b/lib/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "thrift",
-  "version": "1.0.0",
+  "version": "0.12.0",
   "devDependencies": {
     "grunt": "^1.0.2",
     "grunt-cli": "^1.2.0",
diff --git a/lib/js/src/thrift.js b/lib/js/src/thrift.js
index 39e6db1..9418ca3 100644
--- a/lib/js/src/thrift.js
+++ b/lib/js/src/thrift.js
@@ -46,7 +46,7 @@
      * @const {string} Version
      * @memberof Thrift
      */
-    Version: '1.0.0-dev',
+    Version: '0.12.0',
 
     /**
      * Thrift IDL type string to Id mapping.
diff --git a/lib/lua/THttpTransport.lua b/lib/lua/THttpTransport.lua
index 5bbfece..060a8ab 100644
--- a/lib/lua/THttpTransport.lua
+++ b/lib/lua/THttpTransport.lua
@@ -25,7 +25,7 @@
   wBuf = '',
   rBuf = '',
   CRLF = '\r\n',
-  VERSION = '1.0.0',
+  VERSION = '0.12.0',
   isServer = true
 }
 
diff --git a/lib/lua/Thrift.lua b/lib/lua/Thrift.lua
index a9a9078..d495729 100644
--- a/lib/lua/Thrift.lua
+++ b/lib/lua/Thrift.lua
@@ -48,7 +48,7 @@
   return count
 end
 
-version = 1.0
+version = '0.12.0'
 
 TType = {
   STOP   = 0,
diff --git a/lib/netcore/Thrift/Properties/AssemblyInfo.cs b/lib/netcore/Thrift/Properties/AssemblyInfo.cs
index e3118ab..68cd49c 100644
--- a/lib/netcore/Thrift/Properties/AssemblyInfo.cs
+++ b/lib/netcore/Thrift/Properties/AssemblyInfo.cs
@@ -52,5 +52,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 
-[assembly: AssemblyVersion("1.0.0.1")]
-[assembly: AssemblyFileVersion("1.0.0.1")]
\ No newline at end of file
+[assembly: AssemblyVersion("0.12.0.0")]
+[assembly: AssemblyFileVersion("0.12.0.0")]
diff --git a/lib/netcore/Thrift/Transports/Client/THttpClientTransport.cs b/lib/netcore/Thrift/Transports/Client/THttpClientTransport.cs
index 16754b2..6067141 100644
--- a/lib/netcore/Thrift/Transports/Client/THttpClientTransport.cs
+++ b/lib/netcore/Thrift/Transports/Client/THttpClientTransport.cs
@@ -149,7 +149,7 @@
             }
 
             httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-thrift"));
-            httpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("THttpClientTransport", "1.0.0"));
+            httpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("THttpClientTransport", "0.12.0"));
 
             if (CustomHeaders != null)
             {
@@ -223,4 +223,4 @@
             _isDisposed = true;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/lib/ocaml/_oasis b/lib/ocaml/_oasis
index 4dd95e5..315183f 100644
--- a/lib/ocaml/_oasis
+++ b/lib/ocaml/_oasis
@@ -1,5 +1,5 @@
 Name: libthrift-ocaml
-Version: 1.0
+Version: 0.12.0
 OASISFormat: 0.3
 Synopsis: OCaml bindings for the Apache Thrift RPC system
 Authors: Apache Thrift Developers <dev@thrift.apache.org>
diff --git a/lib/perl/lib/Thrift.pm b/lib/perl/lib/Thrift.pm
index 592d1dd..107b2a2 100644
--- a/lib/perl/lib/Thrift.pm
+++ b/lib/perl/lib/Thrift.pm
@@ -31,6 +31,6 @@
 #
 
 package Thrift;
-use version 0.77; our $VERSION = version->declare("v1.0_0");
+use version 0.77; our $VERSION = version->declare("v0.12.0_0");
 
 1;
diff --git a/lib/py/setup.py b/lib/py/setup.py
index 4c2877a..6ee28df 100644
--- a/lib/py/setup.py
+++ b/lib/py/setup.py
@@ -90,7 +90,7 @@
     twisted_deps = ['twisted']
 
     setup(name='thrift',
-          version='1.0.0-dev',
+          version='0.12.0',
           description='Python bindings for the Apache Thrift RPC system',
           author='Thrift Developers',
           author_email='dev@thrift.apache.org',
diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index 0f96c3f..5a3a0ae 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -3,7 +3,7 @@
 
 Gem::Specification.new do |s|
   s.name        = 'thrift'
-  s.version     = '1.0.0.0'
+  s.version     = '0.12.0'
   s.authors     = ['Thrift Developers']
   s.email       = ['dev@thrift.apache.org']
   s.homepage    = 'http://thrift.apache.org'
diff --git a/lib/rs/Cargo.toml b/lib/rs/Cargo.toml
index f5844b4..e79198d 100644
--- a/lib/rs/Cargo.toml
+++ b/lib/rs/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "thrift"
 description = "Rust bindings for the Apache Thrift RPC system"
-version = "1.0.0"
+version = "0.12.0"
 license = "Apache-2.0"
 authors = ["Apache Thrift Developers <dev@thrift.apache.org>"]
 homepage = "http://thrift.apache.org"
diff --git a/lib/st/package.xml b/lib/st/package.xml
index 72194fc..7f6b234 100644
--- a/lib/st/package.xml
+++ b/lib/st/package.xml
@@ -17,7 +17,7 @@
  specific language governing permissions and limitations
  under the License.
  -->
-<!-- Apache Thrift Smalltalk library version 1.0 -->
+<!-- Apache Thrift Smalltalk library version 0.12.0 -->
 <package>
   <name>libthrift-st</name>
   <file>thrift.st</file>