diff --git a/setup.py b/setup.py
index 90aa9d6..9bdbd96 100644
--- a/setup.py
+++ b/setup.py
@@ -218,7 +218,7 @@ class BuildCMakeExt(build_ext):
 CosmoTool_extension = CMakeExtension(name="cosmotool")
 
 setup(name='cosmotool',
-      version='1.0.0a5',
+      version='1.0.0a6',
       packages=["cosmotool"],
       package_dir={'cosmotool': 'python/cosmotool'},
       install_requires=['numpy','cffi','numexpr','pyfftw','h5py'],