diff --git a/README.md b/README.md
index 2f1bdd5..55c4745 100644
--- a/README.md
+++ b/README.md
@@ -184,7 +184,7 @@ Here's how to package, test, and ship a new release.
     ```py
     from lexrpc import Server
 
-    server = Server([{
+    server = Server(lexicons=[{
         'lexicon': 1,
         'id': 'io.example.ping',
         'defs': {
@@ -228,7 +228,7 @@ Here's how to package, test, and ship a new release.
 
 ## Changelog
 
-### 0.4 - unreleased
+### 0.4 - 2023-10-28
 
 * Bundle [the official lexicons](https://github.com/bluesky-social/atproto/tree/main/lexicons/) for `app.bsky` and `com.atproto`, use them by default.
 * `Base`:
diff --git a/docs/conf.py b/docs/conf.py
index ebe745c..7c65324 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -88,9 +88,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.3'
+version = '0.4'
 # The full version, including alpha/beta/rc tags.
-release = '0.3'
+release = '0.4'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/docs/index.rst b/docs/index.rst
index 57b6219..c5256a9 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -254,7 +254,7 @@ Here’s how to package, test, and ship a new release.
 
        from lexrpc import Server
 
-       server = Server([{
+       server = Server(lexicons=[{
            'lexicon': 1,
            'id': 'io.example.ping',
            'defs': {
@@ -315,7 +315,7 @@ Here’s how to package, test, and ship a new release.
 Changelog
 ---------
 
-0.4 - unreleased
+0.4 - 2023-10-28
 ~~~~~~~~~~~~~~~~
 
 -  Bundle `the official
@@ -327,10 +327,11 @@ Changelog
 
 -  ``Client``:
 
-   -  Add minimal auth support with ``access_token`` constructor kwarg
-      and attribute. To send authenticated requests, call
-      ``createSession`` or ``refreshSession`` to get an access token,
-      then set it on a ``Client``.
+   -  Add minimal auth support with ``access_token`` and
+      ``refresh_token`` constructor kwargs and ``session`` attribute. If
+      you use a ``Client`` to call ``com.atproto.server.createSession``
+      or ``com.atproto.server.refreshSession``, the returned tokens will
+      be automatically stored and used in future requests.
    -  Bug fix: handle trailing slash on server address, eg
       ``http://ser.ver/`` vs ``http://ser.ver``.
    -  Default server address to official ``https://bsky.social`` PDS.
@@ -338,10 +339,22 @@ Changelog
       ``User-Agent: lexrpc (https://lexrpc.readthedocs.io/)`` request
       header.
 
+-  ``server``:
+
+   -  Add new ``Redirect`` class. Handlers can raise this to indicate
+      that the web server should serve an HTTP redirect. `Whether this
+      is official supported by the XRPC spec is still
+      TBD. <https://github.com/bluesky-social/atproto/discussions/1228>`__
+
 -  ``flask_server``:
 
    -  Return HTTP 405 error on HTTP requests to subscription (websocket)
       XRPCs.
+   -  Support the new ``Redirect`` exception.
+   -  Add the ``error`` field to the JSON response bodies for most error
+      responses.
+
+.. _section-1:
 
 0.3 - 2023-08-29
 ~~~~~~~~~~~~~~~~
@@ -353,7 +366,7 @@ Changelog
 -  Add new ``Server.register`` method for manually registering handlers.
 -  Bug fix for server ``@method`` decorator.
 
-.. _section-1:
+.. _section-2:
 
 0.2 - 2023-03-13
 ~~~~~~~~~~~~~~~~
@@ -370,7 +383,7 @@ put more effort into matching and fully implementing them. Stay tuned!
    format <https://github.com/snarfed/atproto/commit/63b9873bb1699b6bce54e7a8d3db2fcbd2cfc5ab>`__.
    Original format is no longer supported.
 
-.. _section-2:
+.. _section-3:
 
 0.1 - 2022-12-13
 ~~~~~~~~~~~~~~~~
diff --git a/pyproject.toml b/pyproject.toml
index d73a000..b55f71d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ where = ['.']
 
 [project]
 name = 'lexrpc'
-version = '0.3'
+version = '0.4'
 authors = [
     { name='Ryan Barrett', email='lexrpc@ryanb.org' },
 ]
@@ -29,6 +29,11 @@ dependencies = [
     'jsonschema>=4.0',
     'requests>=2.0',
     'simple-websocket',
+    # we don't directly depend on typing-extensions; this is only here because
+    # 4.6.0 introduced an incompatibility with the typing-validation package
+    # that's still not fixed yet.
+    # https://github.com/hashberg-io/typing-validation/issues/1
+    'typing-extensions<4.6.0',
 ]
 classifiers = [
     'Programming Language :: Python :: 3',