diff --git a/CHANGES.md b/CHANGES.md
index 4eb10ff4..dae78978 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # python-socketio change log
 
+**Release 5.2.1** - 2021-04-18
+
+- Fixed incorrect handling of dashes inside the JSON payload of a packet [#675](https://github.com/miguelgrinberg/python-socketio/issues/675) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/f4e101079fdc49c673ab9433aca8346480cc9e4f))
+
 **Release 5.2.0** - 2021-04-17
 
 - Pass custom authentication data with client connection [#661](https://github.com/miguelgrinberg/python-socketio/issues/661) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/a07eedf54e535843401cd8b280c1bb24de3dfd27))
diff --git a/socketio/__init__.py b/socketio/__init__.py
index 6eeea3aa..4f5235e1 100644
--- a/socketio/__init__.py
+++ b/socketio/__init__.py
@@ -27,7 +27,7 @@
     AsyncRedisManager = None
     AsyncAioPikaManager = None
 
-__version__ = '5.2.1dev'
+__version__ = '5.2.1'
 
 __all__ = ['__version__', 'Client', 'Server', 'BaseManager', 'PubSubManager',
            'KombuManager', 'RedisManager', 'ZmqManager', 'KafkaManager',