diff --git a/docs/source/release-notes/3.9.1.rst b/docs/source/release-notes/3.9.1.rst
new file mode 100644
index 0000000..55bccdc
--- /dev/null
+++ b/docs/source/release-notes/3.9.1.rst
@@ -0,0 +1,15 @@
+3.9.1 -- 2021-04-15
+-------------------
+
+You can view the `3.9.1 milestone`_ on GitHub for more details.
+
+Bugs Fixed
+~~~~~~~~~~
+
+- Fix codes being ignored by plugins utilizing ``extend_default_ignore`` (See
+  also :pull:`1317`)
+
+
+.. all links
+.. _3.9.1 milestone:
+    https://github.com/PyCQA/flake8/milestone/38
diff --git a/docs/source/release-notes/index.rst b/docs/source/release-notes/index.rst
index 33b6faa..9fcdb85 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::
+    3.9.1
     3.9.0
     3.8.4
     3.8.3
diff --git a/src/flake8/__init__.py b/src/flake8/__init__.py
index 7b39e56..fb9cec5 100644
--- a/src/flake8/__init__.py
+++ b/src/flake8/__init__.py
@@ -16,7 +16,7 @@ from typing import Type
 LOG = logging.getLogger(__name__)
 LOG.addHandler(logging.NullHandler())
 
-__version__ = "3.9.0"
+__version__ = "3.9.1"
 __version_info__ = tuple(
     int(i) for i in __version__.split(".") if i.isdigit()
 )