diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 7fc3cdf..51dc391 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
   "packages/python": "5.0.7",
-  "packages/rust/core": "4.0.0"
+  "packages/rust/core": "4.0.1"
 }
diff --git a/packages/rust/core/CHANGELOG.md b/packages/rust/core/CHANGELOG.md
index f21a294..cd66598 100644
--- a/packages/rust/core/CHANGELOG.md
+++ b/packages/rust/core/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [4.0.1](https://github.com/OpenDisplay/epaper-dithering/compare/epaper-dithering-core-v4.0.0...epaper-dithering-core-v4.0.1) (2026-07-05)
+
+
+### Bug Fixes
+
+* **dither:** correct ordered-dither brightness, palette scaling, and tone-map edge cases ([6765760](https://github.com/OpenDisplay/epaper-dithering/commit/676576051fd3581df53ddcae8ee3f892a4133ba3))
+
+
+### Performance Improvements
+
+* **dither:** eliminate per-pixel powf in ordered dither; hoist gamut edges ([bafc435](https://github.com/OpenDisplay/epaper-dithering/commit/bafc435fbb4bd3c38af39d573fdd4392c01e86ff))
+
 ## [4.0.0](https://github.com/OpenDisplay/epaper-dithering/compare/epaper-dithering-core-v3.0.0...epaper-dithering-core-v4.0.0) (2026-05-21)
 
 
diff --git a/packages/rust/core/Cargo.toml b/packages/rust/core/Cargo.toml
index 5915701..ce1abe1 100644
--- a/packages/rust/core/Cargo.toml
+++ b/packages/rust/core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "epaper-dithering-core"
-version = "4.0.0"
+version = "4.0.1"
 edition = "2024"
 description = "High-quality dithering algorithms for e-paper / e-ink displays — OKLab color matching, error diffusion, ordered dithering, measured palettes"
 license = "MIT"