diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62ca1b3..ec50b4d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,11 +1,16 @@
-# v0.3.2 (unreleased)
+# v0.4.0 (unreleased)
 
+* Dropped support for using a custom maubot API base path.
+  * The public URL can still have a path prefix, e.g. when using a reverse
+    proxy. Both the web interface and `mbc` CLI tool should work fine with
+    custom prefixes.
 * Added `evt.redact()` as a shortcut for `self.client.redact(evt.room_id, evt.event_id)`.
 * Fixed `mbc logs` command not working on Python 3.8+.
 * Fixed saving plugin configs (broke in v0.3.0).
 * Fixed SSO login using the wrong API path (probably broke in v0.3.0).
 * Stopped using `cd` in the docker image's `mbc` wrapper to enable using
   path-dependent commands like `mbc build` by mounting a directory.
+* Updated Docker image to Alpine 3.17.
 
 # v0.3.1 (2022-03-29)