diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 7fba70136..f35f2c127 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,6 +1,14 @@
 Full release notes, with more details and upgrade information, are available at:
 https://channels.readthedocs.io/en/latest/releases
 
+2.4.0 (2019-12-18)
+------------------
+
+* Wraps session save calls in ``database_sync_to_async()``, for compatibility
+  with Django 3.0's ``async_unsafe()`` checks.
+
+* Drops compatibility with all Django versions lower than 2.2.
+
 2.3.1 (2019-10-23)
 ------------------
 
diff --git a/channels/__init__.py b/channels/__init__.py
index 0348a6691..3f074e844 100644
--- a/channels/__init__.py
+++ b/channels/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.3.1"
+__version__ = "2.4.0"
 
 default_app_config = "channels.apps.ChannelsConfig"
 DEFAULT_CHANNEL_LAYER = "default"
diff --git a/docs/releases/2.4.0.rst b/docs/releases/2.4.0.rst
new file mode 100644
index 000000000..46f57a975
--- /dev/null
+++ b/docs/releases/2.4.0.rst
@@ -0,0 +1,16 @@
+2.4.0 Release Notes
+===================
+
+Channels 2.4 brings compatibility with Django 3.0s ``async_unsafe()`` checks.
+(Specifically we ensure session save calls are made inside an asgiref
+``database_sync_to_async()``.)
+
+If you are using Daphne, it is recommended that you install Daphne version
+2.4.1 or later for full compatibility with Django 3.0.
+
+Backwards Incompatible Changes
+------------------------------
+
+In line with the guidance provided by Django's supported versions policy we now
+also drop support for all Django versions before 2.2, which is the current LTS.
+
diff --git a/docs/releases/index.rst b/docs/releases/index.rst
index e0afb1047..c90afe4c9 100644
--- a/docs/releases/index.rst
+++ b/docs/releases/index.rst
@@ -28,3 +28,4 @@ Release Notes
    2.1.7
    2.2.0
    2.3.0
+   2.4.0