diff --git a/docs/source/conf.py b/docs/source/conf.py
index 2d15ea8..18179f5 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -13,7 +13,7 @@ sys.path.insert(0, os.path.abspath('../../src/'))
 project = 'Flask-DigestAuth'
 copyright = '2022-2023, imacat'
 author = 'imacat'
-release = '0.3.1'
+release = '0.4.0'
 
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
diff --git a/setup.cfg b/setup.cfg
index 74847cd..2271eeb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,7 +17,7 @@
 
 [metadata]
 name = Flask-DigestAuth
-version = 0.3.1
+version = 0.4.0
 author = imacat
 author_email = imacat@mail.imacat.idv.tw
 description = The Flask HTTP Digest Authentication project.