diff --git a/README.md b/README.md
index 30dc8bc3..d103dfa9 100644
--- a/README.md
+++ b/README.md
@@ -63,6 +63,7 @@ To build and develop Mosaic locally:
 * Run `npm i` to install dependencies.
 * Run `npm test` to run the test suite.
 * Run `npm run build` to build client-side bundles.
+* Run `uv build --all-packages` to build the Python packages.
 
 To run local interactive examples:
 
diff --git a/packages/duckdb-server/package.json b/packages/duckdb-server/package.json
index 45401b4d..f5d3657f 100644
--- a/packages/duckdb-server/package.json
+++ b/packages/duckdb-server/package.json
@@ -6,7 +6,6 @@
     "prepublishOnly": "uv run pytest && uv run ruff check && uv run ruff format --check",
     "publish": "uv build && uvx twine upload --skip-existing dist/*",
     "release": "npm run prepublishOnly && npm run publish",
-    "dev": "uv run watchmedo auto-restart --pattern '*.py' --recursive --signal SIGTERM uv run duckdb-server",
-    "clean": "rimraf dist"
+    "dev": "uv run watchmedo auto-restart --pattern '*.py' --recursive --signal SIGTERM uv run duckdb-server"
   }
 }
diff --git a/packages/widget/package.json b/packages/widget/package.json
index 383233b7..add728b4 100644
--- a/packages/widget/package.json
+++ b/packages/widget/package.json
@@ -16,8 +16,7 @@
     "lint": "eslint src",
     "prepublishOnly": "npm run test && npm run lint && uv run ruff check && uv run ruff format --check && npm run build",
     "publish": "uv build && uvx twine upload --skip-existing dist/*",
-    "release": "npm run prepublishOnly && npm run publish",
-    "clean": "rimraf dist"
+    "release": "npm run prepublishOnly && npm run publish"
   },
   "dependencies": {
     "@uwdata/mosaic-core": "^0.12.0",
diff --git a/uv.lock b/uv.lock
index 7513dc54..014ee9b1 100644
--- a/uv.lock
+++ b/uv.lock
@@ -412,7 +412,7 @@ wheels = [
 
 [[package]]
 name = "duckdb-server"
-version = "0.11.0"
+version = "0.12.0"
 source = { editable = "packages/duckdb-server" }
 dependencies = [
     { name = "diskcache" },
@@ -943,7 +943,7 @@ wheels = [
 
 [[package]]
 name = "mosaic-widget"
-version = "0.11.0"
+version = "0.12.0"
 source = { editable = "packages/widget" }
 dependencies = [
     { name = "anywidget" },