diff --git a/appveyor.yml b/appveyor.yml
index 3138606..519e91c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,29 +1,31 @@
-version: 4.1.{build}
+version: 4.2b4.{build}
 
 image:
 - Visual Studio 2015
 
 environment:
   matrix:
-    - platform: x86
-      ARCH: x86
-      GENERATOR: "Visual Studio 14 2015"
-      PYTHON_VER: Python27
-    - platform: x86
-      ARCH: x86
-      GENERATOR: "Visual Studio 14 2015"
-      PYTHON_VER: Python34
-    - platform: x64
-      ARCH: amd64
-      GENERATOR: "Visual Studio 14 2015 Win64"
-      PYTHON_VER: Python27-x64
-    - platform: x64
-      ARCH: amd64
-      GENERATOR: "Visual Studio 14 2015 Win64"
-      PYTHON_VER: Python34-x64
+  - platform: x86
+    ARCH: x86
+    GENERATOR: "Visual Studio 14 2015"
+    PYTHON_VER: Python27
+  - platform: x86
+    ARCH: x86
+    GENERATOR: "Visual Studio 14 2015"
+    PYTHON_VER: Python34
+  - platform: x64
+    ARCH: amd64
+    GENERATOR: "Visual Studio 14 2015 Win64"
+    PYTHON_VER: Python27-x64
+  - platform: x64
+    ARCH: amd64
+    GENERATOR: "Visual Studio 14 2015 Win64"
+    PYTHON_VER: Python34-x64
 
 before_build:
-- git clone https://github.com/yaml/libyaml.git
+- git clone
+    --branch=0.2.2-pre1
+    https://github.com/yaml/libyaml.git
 - call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" %ARCH%
 - set PATH=C:\%PYTHON_VER%\Scripts;%PATH%
 - C:\%PYTHON_VER%\python.exe -m pip install cython wheel
@@ -34,7 +36,12 @@
 - cmake.exe -G"%GENERATOR%" -DBUILD_SHARED_LIBS=ON ..\libyaml
 - cmake.exe --build . --config Release --clean-first
 - cd ..
-- C:\%PYTHON_VER%\python.exe setup.py --with-libyaml build_ext -I C:\projects\pyyaml\libyaml\include -L C:\projects\pyyaml\%PYTHON_VER%\;C:\projects\pyyaml\%PYTHON_VER%\Release build bdist_wininst bdist_wheel
+- C:\%PYTHON_VER%\python.exe setup.py
+    --with-libyaml
+    build_ext
+      -I C:\projects\pyyaml\libyaml\include
+      -L C:\projects\pyyaml\%PYTHON_VER%\;C:\projects\pyyaml\%PYTHON_VER%\Release
+    build bdist_wininst bdist_wheel
 
 after_build:
 - C:\%PYTHON_VER%\python.exe setup.py bdist_wininst bdist_wheel
@@ -44,7 +51,7 @@
 # test_script:
 # - C:\%PYTHON_VER%\python.exe setup.py test
 artifacts:
- - path: 'dist\*.whl'
- - path: 'dist\*.exe'
- - path: '**\*.dll'
- - path: '**\*.lib'
+- path: 'dist\*.whl'
+- path: 'dist\*.exe'
+- path: '**\*.dll'
+- path: '**\*.lib'