diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47ffe17..9ec5b1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.28.0] - 2026-08-13
+
+### Added
+
+- **`MouseButton.String()`** — returns button name (Left, Right, Middle, X1, X2) for debugging and logging. Names match pointer `Button.String()`.
+- **`Modifiers.String()`** — returns deterministic modifier string (Ctrl+Alt+Shift+Super+CapsLock+NumLock). Order matches `gogpu/ui` event convention. Unknown bits are silently ignored.
+
+### Changed
+
+- **deps:** gputypes v0.5.1 → v0.5.2
+- Shared string constants (`stringLeft`, `stringRight`, `stringMiddle`) between `Key.String()`, `Button.String()`, and `MouseButton.String()` — eliminates duplication.
+
 ## [0.27.0] - 2026-08-10
 
 ### Added
diff --git a/go.mod b/go.mod
index bdf5eaa..275cc20 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/gogpu/gpucontext
 
 go 1.25
 
-require github.com/gogpu/gputypes v0.5.1
+require github.com/gogpu/gputypes v0.5.2
diff --git a/go.sum b/go.sum
index eab2fdd..762a744 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/gogpu/gputypes v0.5.1 h1:X38OPcP6umQqqubzzJYL6Nm1tXHSNQj6TRSAoxdAJmg=
-github.com/gogpu/gputypes v0.5.1/go.mod h1:cnXrDMwTpWTvJLW1Vreop3PcT6a2YP/i3s91rPaOavw=
+github.com/gogpu/gputypes v0.5.2 h1:3sbKI0+XW36Ekd3d4QhkbpdY7gbgMVgp8Q4+ZNdGhtE=
+github.com/gogpu/gputypes v0.5.2/go.mod h1:cnXrDMwTpWTvJLW1Vreop3PcT6a2YP/i3s91rPaOavw=