diff --git a/cython/python_solvespace/__init__.py b/cython/python_solvespace/__init__.py
index 6ded1338..7a418578 100644
--- a/cython/python_solvespace/__init__.py
+++ b/cython/python_solvespace/__init__.py
@@ -8,7 +8,7 @@ __author__ = "Yuan Chang"
 __copyright__ = "Copyright (C) 2016-2019"
 __license__ = "GPLv3+"
 __email__ = "pyslvs@gmail.com"
-__version__ = "3.0.5"
+__version__ = "3.0.6"
 
 from enum import IntEnum, auto
 from .slvs import (
diff --git a/cython/setup.cfg b/cython/setup.cfg
index 06d6d07f..c4b757d2 100644
--- a/cython/setup.cfg
+++ b/cython/setup.cfg
@@ -14,6 +14,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Cython
     Topic :: Scientific/Engineering
     License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)