diff --git a/lib/as3/gradle.properties b/lib/as3/gradle.properties
index 51179a1..d746018 100644
--- a/lib/as3/gradle.properties
+++ b/lib/as3/gradle.properties
@@ -1,7 +1,8 @@
 # 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=0.12.1thrift.groupid=org.apache.thrift
+thrift.version=0.12.1
+thrift.groupid=org.apache.thrift
 release=false
 sign=false
 
diff --git a/lib/c_glib/README.md b/lib/c_glib/README.md
index dd84f3d..0431e18 100644
--- a/lib/c_glib/README.md
+++ b/lib/c_glib/README.md
@@ -35,7 +35,7 @@
 Breaking Changes
 ================
 
-0.12.0
+0.12.x
 ------
 
 The compiler's handling of namespaces when generating the name of types,
diff --git a/lib/cocoa/src/Thrift.h b/lib/cocoa/src/Thrift.h
index 502ba17..18488f9 100644
--- a/lib/cocoa/src/Thrift.h
+++ b/lib/cocoa/src/Thrift.h
@@ -17,4 +17,4 @@
  * under the License.
  */
 
-#define ThriftVersion @"0.12.0"
+#define ThriftVersion @"0.12.1"
diff --git a/lib/csharp/ThriftMSBuildTask/Properties/AssemblyInfo.cs b/lib/csharp/ThriftMSBuildTask/Properties/AssemblyInfo.cs
index 19abcf7..043a6fa 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("0.12.0.*")]
-[assembly: AssemblyFileVersion("0.12.0.*")]
+[assembly: AssemblyVersion("0.12.1.*")]
+[assembly: AssemblyFileVersion("0.12.1.*")]
diff --git a/lib/csharp/ThriftMSBuildTask/ThriftMSBuildTask.csproj b/lib/csharp/ThriftMSBuildTask/ThriftMSBuildTask.csproj
index 68427c3..c2b631a 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>0.12.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.1.%2a</ApplicationVersion>
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
diff --git a/lib/csharp/src/Properties/AssemblyInfo.cs b/lib/csharp/src/Properties/AssemblyInfo.cs
index 23fbc73..3511b5f 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("0.12.0.1")]
-[assembly: AssemblyFileVersion("0.12.0.1")]
+[assembly: AssemblyVersion("0.12.1.1")]
+[assembly: AssemblyFileVersion("0.12.1.1")]
diff --git a/lib/csharp/src/Thrift.csproj b/lib/csharp/src/Thrift.csproj
index ede152d..d28f7dc 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>0.12.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.1.%2a</ApplicationVersion>
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
diff --git a/lib/csharp/test/Multiplex/Client/MultiplexClient.csproj b/lib/csharp/test/Multiplex/Client/MultiplexClient.csproj
index 4df1cbc..2e96f55 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>0.12.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.1.%2a</ApplicationVersion>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>
diff --git a/lib/csharp/test/Multiplex/Client/Properties/AssemblyInfo.cs b/lib/csharp/test/Multiplex/Client/Properties/AssemblyInfo.cs
index 5ee34a1..41ea386 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("0.12.0.0")]
-[assembly: AssemblyFileVersion("0.12.0.0")]
+[assembly: AssemblyVersion("0.12.1.0")]
+[assembly: AssemblyFileVersion("0.12.1.0")]
diff --git a/lib/csharp/test/Multiplex/Server/MultiplexServer.csproj b/lib/csharp/test/Multiplex/Server/MultiplexServer.csproj
index 57ef76d..bd4e45a 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>0.12.0.%2a</ApplicationVersion>
+    <ApplicationVersion>0.12.1.%2a</ApplicationVersion>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
   </PropertyGroup>
diff --git a/lib/csharp/test/Multiplex/Server/Properties/AssemblyInfo.cs b/lib/csharp/test/Multiplex/Server/Properties/AssemblyInfo.cs
index 65fb4ce..1efbf12 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("0.12.0.0")]
-[assembly: AssemblyFileVersion("0.12.0.0")]
+[assembly: AssemblyVersion("0.12.1.0")]
+[assembly: AssemblyFileVersion("0.12.1.0")]
diff --git a/lib/csharp/test/ThriftMVCTest/Properties/AssemblyInfo.cs b/lib/csharp/test/ThriftMVCTest/Properties/AssemblyInfo.cs
index 186257d..0254766 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("0.12.0.0")]
-[assembly: AssemblyFileVersion("0.12.0.0")]
+[assembly: AssemblyVersion("0.12.1.0")]
+[assembly: AssemblyFileVersion("0.12.1.0")]
diff --git a/lib/d/src/thrift/base.d b/lib/d/src/thrift/base.d
index 260e155..f15d2d2 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 = "0.12.0";
+enum VERSION = "0.12.1";
 
 /**
  * Functions used for logging inside Thrift.
diff --git a/lib/dart/pubspec.yaml b/lib/dart/pubspec.yaml
index 365b2cd..4f205eb 100644
--- a/lib/dart/pubspec.yaml
+++ b/lib/dart/pubspec.yaml
@@ -16,7 +16,7 @@
 # under the License.
 
 name: thrift
-version: 0.12.0
+version: 0.12.1
 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 8293d07..dada330 100644
--- a/lib/delphi/src/Thrift.pas
+++ b/lib/delphi/src/Thrift.pas
@@ -27,7 +27,7 @@
   Thrift.Protocol;
 
 const
-  Version = '0.12.0';
+  Version = '0.12.1';
 
 type
   TException = Thrift.Exception.TException; // compatibility alias
diff --git a/lib/erl/src/thrift.app.src b/lib/erl/src/thrift.app.src
index b02ab21..ce49f61 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, "0.12.0"},
+  {vsn, "0.12.1"},
 
   % 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 ef7cc3a..cb9f8b0 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 (0.12.0)
+// Autogenerated by Thrift Compiler (0.12.1)
 // 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 02e6919..29f88a8 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 0.12.0 lib/haxe`
-    - `haxelib git thrift https://github.com/apache/thrift.git 0.12.0 lib/haxe`
+    - `haxelib git thrift https://git.apache.org/thrift.git 0.12.1 lib/haxe`
+    - `haxelib git thrift https://github.com/apache/thrift.git 0.12.1 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 8d1bb11..df107f9 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": "0.12.0",
+	"version": "0.12.1",
 	"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 b13cff4..cab9d1e 100644
--- a/lib/hs/thrift.cabal
+++ b/lib/hs/thrift.cabal
@@ -18,7 +18,7 @@
 --
 
 Name:           thrift
-Version:        0.12.0
+Version:        0.12.1
 Cabal-Version:  1.24
 License:        Apache
 Category:       Foreign
diff --git a/lib/java/gradle.properties b/lib/java/gradle.properties
index 7fef76d..42c4010 100644
--- a/lib/java/gradle.properties
+++ b/lib/java/gradle.properties
@@ -1,7 +1,7 @@
 # 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=0.12.0
+thrift.version=0.12.1
 thrift.groupid=org.apache.thrift
 release=false
 
diff --git a/lib/js/package.json b/lib/js/package.json
index 2ddd238..429751d 100644
--- a/lib/js/package.json
+++ b/lib/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "thrift",
-  "version": "0.12.0",
+  "version": "0.12.1",
   "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 68b8924..9c8ebff 100644
--- a/lib/js/src/thrift.js
+++ b/lib/js/src/thrift.js
@@ -46,7 +46,7 @@
      * @const {string} Version
      * @memberof Thrift
      */
-    Version: '0.12.0',
+    Version: '0.12.1',
 
     /**
      * Thrift IDL type string to Id mapping.
diff --git a/lib/lua/THttpTransport.lua b/lib/lua/THttpTransport.lua
index 060a8ab..df957cd 100644
--- a/lib/lua/THttpTransport.lua
+++ b/lib/lua/THttpTransport.lua
@@ -25,7 +25,7 @@
   wBuf = '',
   rBuf = '',
   CRLF = '\r\n',
-  VERSION = '0.12.0',
+  VERSION = '0.12.1',
   isServer = true
 }
 
diff --git a/lib/lua/Thrift.lua b/lib/lua/Thrift.lua
index d495729..789a20c 100644
--- a/lib/lua/Thrift.lua
+++ b/lib/lua/Thrift.lua
@@ -48,7 +48,7 @@
   return count
 end
 
-version = '0.12.0'
+version = '0.12.1'
 
 TType = {
   STOP   = 0,
diff --git a/lib/netcore/Thrift/Properties/AssemblyInfo.cs b/lib/netcore/Thrift/Properties/AssemblyInfo.cs
index 68cd49c..11e66f9 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("0.12.0.0")]
-[assembly: AssemblyFileVersion("0.12.0.0")]
+[assembly: AssemblyVersion("0.12.1.0")]
+[assembly: AssemblyFileVersion("0.12.1.0")]
diff --git a/lib/netcore/Thrift/Transports/Client/THttpClientTransport.cs b/lib/netcore/Thrift/Transports/Client/THttpClientTransport.cs
index 6067141..d24e537 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", "0.12.0"));
+            httpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("THttpClientTransport", "0.12.1"));
 
             if (CustomHeaders != null)
             {
diff --git a/lib/ocaml/_oasis b/lib/ocaml/_oasis
index 315183f..ed4a88b 100644
--- a/lib/ocaml/_oasis
+++ b/lib/ocaml/_oasis
@@ -1,5 +1,5 @@
 Name: libthrift-ocaml
-Version: 0.12.0
+Version: 0.12.1
 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 107b2a2..71be7d5 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("v0.12.0_0");
+use version 0.77; our $VERSION = version->declare("v0.12.1");
 
 1;
diff --git a/lib/php/README.md b/lib/php/README.md
index 7170104..f903c6e 100644
--- a/lib/php/README.md
+++ b/lib/php/README.md
@@ -53,7 +53,7 @@
 
 # Breaking Changes
 
-## 0.12.0
+## 0.12.x
 
 1. [PSR-4](https://www.php-fig.org/psr/psr-4/) loader is now the default. If you want to use class maps instead, use `-gen php:classmap`.
 
diff --git a/lib/py/setup.py b/lib/py/setup.py
index 6ee28df..2043ab0 100644
--- a/lib/py/setup.py
+++ b/lib/py/setup.py
@@ -90,7 +90,7 @@
     twisted_deps = ['twisted']
 
     setup(name='thrift',
-          version='0.12.0',
+          version='0.12.1',
           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 5a3a0ae..3dd38ec 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     = '0.12.0'
+  s.version     = '0.12.1'
   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 e79198d..44b35eb 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 = "0.12.0"
+version = "0.12.1"
 license = "Apache-2.0"
 authors = ["Apache Thrift Developers <dev@thrift.apache.org>"]
 homepage = "http://thrift.apache.org"
diff --git a/lib/rs/README.md b/lib/rs/README.md
index 7c37a10..f611a91 100644
--- a/lib/rs/README.md
+++ b/lib/rs/README.md
@@ -46,7 +46,7 @@
 
 Breaking changes are minimized. When they are made they will be outlined below with transition guidelines.
 
-##### Thrift 0.12.0
+##### Thrift 0.12.x
 
 * **[THRIFT-4529]** - Rust enum variants are now camel-cased instead of uppercased to conform to Rust naming conventions
 
diff --git a/lib/st/package.xml b/lib/st/package.xml
index 7f6b234..8ebbd6d 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 0.12.0 -->
+<!-- Apache Thrift Smalltalk library version 0.12.1 -->
 <package>
   <name>libthrift-st</name>
   <file>thrift.st</file>