diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98f8950..577c29c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ All notable changes to MultiClean are documented here.
 
 ## [Unreleased]
 
+## [0.5.0] - 2026-08-14
+
 ### Fixed
 - Edge smoothing no longer translates the output by one pixel down and to the
   right when `smooth_edge_size` is even. `cv2.morphologyEx(MORPH_OPEN)` applies
@@ -19,6 +21,13 @@ All notable changes to MultiClean are documented here.
   have cached results produced with an even `smooth_edge_size`, regenerate
   them or expect a one-pixel offset against new output.
 
+- The source distribution no longer ships the example notebooks, their sample
+  rasters, or the README artwork. `setuptools-scm` hands the sdist every
+  git-tracked file, so these were swept in automatically — 4.9 MB of a 7.2 MB
+  tarball, none of it read by anything in the package. A `MANIFEST.in` now
+  prunes them, taking the sdist to 3.9 MB. The notebooks remain on GitHub,
+  where the README links them. Wheels were never affected and are unchanged.
+
 ## [0.4.0] - 2026-07-28
 
 ### Changed
@@ -103,7 +112,8 @@ All notable changes to MultiClean are documented here.
 - Documentation: README, two example notebooks (land use, cloud
   shadow), and a Google Colab tutorial notebook.
 
-[Unreleased]: https://github.com/DPIRD-DMA/MultiClean/compare/v0.4.0...HEAD
+[Unreleased]: https://github.com/DPIRD-DMA/MultiClean/compare/v0.5.0...HEAD
+[0.5.0]: https://github.com/DPIRD-DMA/MultiClean/compare/v0.4.0...v0.5.0
 [0.4.0]: https://github.com/DPIRD-DMA/MultiClean/compare/v0.3.1...v0.4.0
 [0.3.1]: https://github.com/DPIRD-DMA/MultiClean/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/DPIRD-DMA/MultiClean/compare/v0.2.0...v0.3.0
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..7cb1c77
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,21 @@
+# setuptools-scm hands the sdist every git-tracked file, which swept in the
+# example notebooks and the sample rasters they read — 4.9 MB of a 7.2 MB
+# tarball, for content nobody installing the package needs. They stay on
+# GitHub, where the README's tutorial badge links them. The wheel was never
+# affected; it is built from `packages` alone.
+prune notebooks
+
+# README artwork and the notebook that regenerates it. The README loads these
+# over raw.githubusercontent.com rather than from the package, so nothing in
+# the sdist reads them.
+prune assets
+
+# Editor config, of no use to anyone unpacking the sdist.
+prune .vscode
+
+# Deliberately kept: tests/ so the sdist can be verified after unpacking, and
+# the CI workflows, RELEASING.md and CHANGELOG.md so a packager can see how the
+# release is built and what changed. Together they are ~48 KB, excepting the
+# 4.9 MB of fixture rasters under tests/data. Note that nothing downstream runs
+# the suite today — the conda-forge recipe only import-checks — so if sdist size
+# becomes a problem again, tests/data is the thing left to reconsider.