diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 00a052d..1898376 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -12,6 +12,15 @@ change to the sidecar protocol bumps the minor.
 
 .. towncrier release notes start
 
+0.4.0 (2026-09-26)
+==================
+
+New Features
+------------
+
+- Apps gained a way to serve their backend's protocol to a remote client: ``createRelay`` (exported from ``@de/shell-main`` with the ``encodeMessage`` and ``encodeBinary`` encoders) listens on a TCP port and speaks the PLOTAPP/PLOTBIN framing, and ``de_shell.remote_client`` is its synchronous, standard-library Python client. (`#12 <https://github.com/directelectron/de-shell/pull/12>`_)
+
+
 0.3.0 (2026-09-24)
 ==================
 
diff --git a/de_shell/__init__.py b/de_shell/__init__.py
index 76433e8..8ccd24c 100644
--- a/de_shell/__init__.py
+++ b/de_shell/__init__.py
@@ -20,6 +20,6 @@
 
 #: The package version — the one place it is written. pyproject.toml reads it
 #: (dynamic version) and the release workflow refuses a tag that disagrees.
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 
 __all__ = ["ipc", "log_stream", "process_guard", "debug_flags", "compute"]
diff --git a/upcoming_changes/12.new_feature.rst b/upcoming_changes/12.new_feature.rst
deleted file mode 100644
index 615fff1..0000000
--- a/upcoming_changes/12.new_feature.rst
+++ /dev/null
@@ -1 +0,0 @@
-Apps gained a way to serve their backend's protocol to a remote client: ``createRelay`` (exported from ``@de/shell-main`` with the ``encodeMessage`` and ``encodeBinary`` encoders) listens on a TCP port and speaks the PLOTAPP/PLOTBIN framing, and ``de_shell.remote_client`` is its synchronous, standard-library Python client.