diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 502f154..3c17f73 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "cell-type-annotation",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Evidence-driven cell-type annotation of pre-clustered single-cell and spatial transcriptomics data: Claude annotates level by level, one routed cross-check per level, signed-off assumptions, critic subagents. Ships a skill and the cell_type_annotation Python package; runs as an analysis-workflow task.",
   "author": {
     "name": "quadbio"
diff --git a/README.md b/README.md
index 5fda01d..a72c158 100644
--- a/README.md
+++ b/README.md
@@ -38,11 +38,12 @@ It requires the [knowledgebase MCP](https://github.com/biocontext-ai/knowledgeba
 
 The plugin, once per machine, from the [quadbio marketplace](https://github.com/quadbio/claude-plugins).
 
-The package, in the analysis repo's `pixi.toml`, next to the scverse stack the task scripts use:
+The package, in the analysis repo's `pixi.toml` (its lock pins the commit), next to the scverse stack the task
+scripts use:
 
 ```toml
 [pypi-dependencies]
-cell-type-annotation = { git = "https://github.com/quadbio/cell-type-annotation", tag = "v0.4.0" }
+cell-type-annotation = { git = "https://github.com/quadbio/cell-type-annotation" }
 ```
 
 Cross-check tools (celltypist, cellmapper, panhumanpy, scvi-tools, scimilarity) are added as a run needs them. Their
@@ -73,9 +74,8 @@ For live package edits in an analysis repo, depend on the checkout:
 
 ## Release
 
-1. Bump `version` in both `pyproject.toml` and `.claude-plugin/plugin.json` (a test checks they agree).
-2. Tag `vX.Y.Z`.
-3. Bump the `ref` in [quadbio/claude-plugins](https://github.com/quadbio/claude-plugins).
+Bump `version` in `.claude-plugin/plugin.json` and merge: the marketplace follows `main`, and users update when the
+version changes.
 
 ## License
 
diff --git a/pyproject.toml b/pyproject.toml
index c18e13b..9b98d87 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,6 @@ requires = [ "hatchling" ]
 
 [project]
 name = "cell-type-annotation"
-version = "0.4.0"
 description = "Method routing, evidence checks, label hierarchies and reports for evidence-driven cell-type annotation."
 readme = "README.md"
 license = "MIT"
@@ -16,6 +15,7 @@ classifiers = [
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
 ]
+dynamic = [ "version" ]
 dependencies = [ "anndata>=0.12", "matplotlib>=3.8", "numpy>=2", "pandas>=2", "scipy" ]
 urls.Source = "https://github.com/quadbio/cell-type-annotation"
 
@@ -23,6 +23,8 @@ urls.Source = "https://github.com/quadbio/cell-type-annotation"
 dev = [ "pre-commit", "pytest" ]
 
 [tool.hatch]
+version.path = ".claude-plugin/plugin.json"
+version.pattern = '"version": "(?P<version>[^"]+)"'
 build.targets.wheel.packages = [ "src/cell_type_annotation" ]
 
 [tool.ruff]
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
deleted file mode 100644
index 2d26782..0000000
--- a/tests/test_plugin.py
+++ /dev/null
@@ -1,13 +0,0 @@
-"""The plugin manifest and the Python package describe the same release."""
-
-import json
-import tomllib
-from pathlib import Path
-
-ROOT = Path(__file__).parents[1]
-
-
-def test_versions_agree():
-    plugin = json.loads((ROOT / ".claude-plugin" / "plugin.json").read_text())
-    package = tomllib.loads((ROOT / "pyproject.toml").read_text())["project"]
-    assert plugin["version"] == package["version"]
diff --git a/uv.lock b/uv.lock
index da40e5b..fb65d13 100644
--- a/uv.lock
+++ b/uv.lock
@@ -52,7 +52,6 @@ wheels = [
 
 [[package]]
 name = "cell-type-annotation"
-version = "0.4.0"
 source = { editable = "." }
 dependencies = [
     { name = "anndata" },