diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 3060407a1..c6488735d 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -2,5 +2,5 @@
   "core": "0.2.0",
   "bindings/c": "0.2.0",
   "packages/js": "0.3.0",
-  "packages/py": "0.3.0"
+  "packages/py": "0.4.0"
 }
diff --git a/packages/py/CHANGELOG.md b/packages/py/CHANGELOG.md
index a43d5984d..56afa32b9 100644
--- a/packages/py/CHANGELOG.md
+++ b/packages/py/CHANGELOG.md
@@ -1,5 +1,21 @@
 # Changelog
 
+## [0.4.0](https://github.com/Ryan-Millard/Img2Num/compare/packages-py-v0.3.0...packages-py-v0.4.0) (2026-08-15)
+
+
+### ⚠ BREAKING CHANGES
+
+* **js:** dist layout and filenames have changed. Artifacts now live at dist/browser/img2num.js, dist/standalone/img2num.umd.js, dist/standalone/img2num.iife.js, and dist/node/img2num.{js,cjs}; deep imports into dist/ must be updated. Export conditions are reordered so bundlers targeting the browser resolve the browser build (they previously matched "import" first and received the node build). Minimum supported Node is now 18.
+
+### ✨ Features
+
+* **js:** ship multi-format artifacts (browser ESM, standalone UMD/IIFE, node ESM/CJS) ([#530](https://github.com/Ryan-Millard/Img2Num/issues/530)) ([f5b1ef9](https://github.com/Ryan-Millard/Img2Num/commit/f5b1ef907e43b68c32bdc15238daae6f28edf40f))
+
+
+### 📚 Documentation
+
+* **website:** add example apps index page and rebuild HTML demos from a shared template ([f5b1ef9](https://github.com/Ryan-Millard/Img2Num/commit/f5b1ef907e43b68c32bdc15238daae6f28edf40f))
+
 ## [0.3.0](https://github.com/Ryan-Millard/Img2Num/compare/packages-py-v0.2.2...packages-py-v0.3.0) (2026-08-13)
 
 
diff --git a/packages/py/pyproject.toml b/packages/py/pyproject.toml
index 366b0e5ae..bc24699d4 100644
--- a/packages/py/pyproject.toml
+++ b/packages/py/pyproject.toml
@@ -2,4 +2,4 @@
 # The authoritative build config is the root pyproject.toml.
 [project]
 name = "img2num"
-version = "0.3.0"
+version = "0.4.0"