diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4c5f7e..b2018b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 All notable changes to PaletteKit are documented here.
 
+## 2.1.1
+
+### Fixed
+- Prevented MMCQ crashes when distinct 8-bit colors collapse into a single
+  5-bit histogram cell, leaving no valid median-cut boundary (#15, #17).
+- Unsplittable boxes no longer block queue progress, and median cut can fall
+  back to another occupied axis while preserving positive-population boxes.
+
 ## 2.1.0
 
 ### Added
diff --git a/README.md b/README.md
index 9f606e6..afe8024 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ async-only Sendable API.
 ```swift
 // Package.swift
 dependencies: [
-    .package(url: "https://github.com/2dubu/PaletteKit", from: "2.1.0"),
+    .package(url: "https://github.com/2dubu/PaletteKit", from: "2.1.1"),
 ]
 ```
 
diff --git a/Sources/PaletteKit/PaletteKit.swift b/Sources/PaletteKit/PaletteKit.swift
index bdb651e..b1b68e6 100644
--- a/Sources/PaletteKit/PaletteKit.swift
+++ b/Sources/PaletteKit/PaletteKit.swift
@@ -1,4 +1,4 @@
 import Foundation
 
 /// The currently-shipped PaletteKit version string. Follows semver.
-public let paletteKitVersion = "2.1.0"
+public let paletteKitVersion = "2.1.1"