diff --git a/docs/source/release-notes/4.0.1.rst b/docs/source/release-notes/4.0.1.rst
new file mode 100644
index 00000000..402e4b04
--- /dev/null
+++ b/docs/source/release-notes/4.0.1.rst
@@ -0,0 +1,15 @@
+4.0.1 -- 2021-10-11
+-------------------
+
+You can view the `4.0.1 milestone`_ on GitHub for more details.
+
+Bugs Fixed
+~~~~~~~~~~
+
+- Fix parallel execution collecting a ``SyntaxError`` (See also :pull:`1410`
+  :issue:`1408`).
+
+
+.. all links
+.. _4.0.1 milestone:
+    https://github.com/PyCQA/flake8/milestone/41
diff --git a/docs/source/release-notes/index.rst b/docs/source/release-notes/index.rst
index 3617ff41..c5d20a3a 100644
--- a/docs/source/release-notes/index.rst
+++ b/docs/source/release-notes/index.rst
@@ -9,6 +9,7 @@ with the newest releases first.
 ==================
 
 .. toctree::
+   4.0.1
    4.0.0
 
 3.x Release Series
diff --git a/src/flake8/__init__.py b/src/flake8/__init__.py
index 6db01e08..6b407488 100644
--- a/src/flake8/__init__.py
+++ b/src/flake8/__init__.py
@@ -16,7 +16,7 @@
 LOG = logging.getLogger(__name__)
 LOG.addHandler(logging.NullHandler())
 
-__version__ = "4.0.0"
+__version__ = "4.0.1"
 __version_info__ = tuple(int(i) for i in __version__.split(".") if i.isdigit())