diff --git a/CHANGES.rst b/CHANGES.rst
index c036b43..d668537 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -8,6 +8,8 @@ UNRELEASED
 ----------
 
 - Fix an issue where loading a thrift file in a sub-thread will cause an error with ``load_fp``.
+- Move static metadata from ``setup.py`` to ``pyproject.toml``.
+- Using a thread pool to avoid ``TAsyncSocket.open`` block the event loop.
 
 
 Version 0.5.1
diff --git a/pyproject.toml b/pyproject.toml
index af83bb1..842c259 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = ["setuptools", "cython>=0.28.4,<4"]
 
 [project]
 name = "thriftpy2"
-version = "0.5.1"
+version = "0.5.2b2"
 description = "Pure python implementation of Apache Thrift."
 authors = [
     {name = "ThriftPy Organization", email = "gotzehsing@gmail.com"},
diff --git a/thriftpy2/__init__.py b/thriftpy2/__init__.py
index 0064e91..be8fb3c 100644
--- a/thriftpy2/__init__.py
+++ b/thriftpy2/__init__.py
@@ -5,7 +5,7 @@
 from .hook import install_import_hook, remove_import_hook
 from .parser import load, load_module, load_fp
 
-__version__ = '0.5.2b1'
+__version__ = '0.5.2b2'
 __python__ = sys.version_info
 __all__ = ["install_import_hook", "remove_import_hook", "load", "load_module",
            "load_fp"]