diff --git a/rtmplite3/rtmp.py b/rtmplite3/rtmp.py
index 983233e..2b2fea6 100644
--- a/rtmplite3/rtmp.py
+++ b/rtmplite3/rtmp.py
@@ -24,7 +24,7 @@
 import random
 
 _debug = _verbose = _recording = False
-_version, _build = "v0.3.5", "20210528"
+_version, _build = "v0.4.0", "20211202"
 
 
 class ConnectionClosed(Exception):
diff --git a/setup.py b/setup.py
index e225c45..0157928 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="rtmplite3",
-    version="0.3.5",
+    version="0.4.0",
     author="KnugiHK",
     author_email="info@knugi.com",
     description="A pure Python 3 RTMP server.",