diff --git a/documentation/docfx/releases/4.150.0-unreleased.md b/documentation/docfx/releases/4.150.0-unreleased.md
new file mode 100644
index 00000000000..09489d9c318
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+++ b/documentation/docfx/releases/4.150.0-unreleased.md
@@ -0,0 +1,42 @@
+<!--
+  RAW PR DATA — Do not remove this comment block.
+  AI uses this data to generate the polished release notes below.
+  Re-run the script to refresh this data from git history.
+
+  Generated: 2026-06-15T21:22:37Z by generate-release-notes.py
+  version:   4.150.0
+  status:    unreleased
+  supersedes: 4.148.0 (preview only, rolled up)
+  branch:    main
+  diff:      release/4.150.0-preview.1..main
+  prs:       2
+
+  - Update harfbuzz to 14.2.1 by @mattleibow in https://github.com/mono/SkiaSharp/pull/4167 (2 commits, 1 day) (skia: mono/skia#257)
+  - Build Tizen native dependencies in a Docker container by @mattleibow in https://github.com/mono/SkiaSharp/pull/4154
+-->
+
+<!-- Generated: 2026-06-15T21:24:00Z by claude-sonnet-4.6 -->
+
+# Version 4.150.0
+
+> **Upcoming release** · In development · Not yet available on NuGet
+
+> **Supersedes [4.148.0](4.148.0-unreleased.md)** · Rolls up preview-only work that was never released as stable — those changes are included cumulatively below.
+
+## Highlights
+
+This in-development release cumulates all preview-only 4.148.0 work — including the Skia m148 engine upgrade, API surface refinements, and significant bug fixes — and adds harfbuzz 14.2.1 plus a containerized Tizen build environment on top of that foundation.
+
+## Breaking Changes
+
+*None in this release.*
+
+## New Features
+
+### Dependencies
+
+- **harfbuzz 14.2.1** — Updates the text shaping engine bundled inside Skia to the latest harfbuzz release. ([#4167](https://github.com/mono/SkiaSharp/pull/4167))
+
+### Platform
+
+- **Tizen builds in Docker** — Tizen native dependencies are now compiled inside a Docker container, improving build reproducibility and environment isolation. ([#4154](https://github.com/mono/SkiaSharp/pull/4154))
diff --git a/documentation/docfx/releases/TOC.yml b/documentation/docfx/releases/TOC.yml
index eda96b5626e..9849053d620 100644
--- a/documentation/docfx/releases/TOC.yml
+++ b/documentation/docfx/releases/TOC.yml
@@ -1,5 +1,10 @@
 - name: Overview
   href: index.md
+- name: Version 4.150.x
+  href: 4.150.0-unreleased.md
+  items:
+    - name: Version 4.150.0 (Unreleased)
+      href: 4.150.0-unreleased.md
 - name: Version 4.148.x
   href: 4.148.0-unreleased.md
   items:
diff --git a/documentation/docfx/releases/index.md b/documentation/docfx/releases/index.md
index e5d5034987a..86acba2d815 100644
--- a/documentation/docfx/releases/index.md
+++ b/documentation/docfx/releases/index.md
@@ -4,6 +4,8 @@ Release notes for all SkiaSharp versions.
 
 ### SkiaSharp 4.x
 
+- **Version 4.150.x**
+  - [Version 4.150.0 (Unreleased)](4.150.0-unreleased.md)
 - **Version 4.148.x**
   - [Version 4.148.0 (Unreleased)](4.148.0-unreleased.md)
 - **Version 4.147.x**