diff --git a/CHANGELOG.md b/CHANGELOG.md
index d012292..5db7e40 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to aipooljs are summarized here.
 
 ## [Unreleased]
 
+## [0.5.9] - 2026-06-29
+
+- Family version alignment at 0.5.9 — no runtime or API change.
+
 ## [0.5.8] - 2026-06-14
 
 - Documentation-only slimming pass across README, stability notes, review backlog, and LLM context. Family version alignment at 0.5.8 — no runtime or API change. A stricter overflow-handler mode that prevents aliasing by default remains a documented follow-up.
diff --git a/README.md b/README.md
index 67773d0..7a03913 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 Tiny strict object pool for hot acquire/release paths: sprites, bullets, particles, DOM nodes, and worker slots.
 
-> **Status: 0.5.8 - stable 1.0-track surface.** The root entry is the public API.
+> **Status: 0.5.9 - stable 1.0-track surface.** The root entry is the public API.
 
 ## Install
 
diff --git a/README_ZHTW.md b/README_ZHTW.md
index 03a9207..f7712c5 100644
--- a/README_ZHTW.md
+++ b/README_ZHTW.md
@@ -2,7 +2,7 @@
 
 小型嚴格 object pool，適合高頻 acquire/release 路徑：sprites、bullets、particles、DOM nodes、worker slots。
 
-> **狀態：0.5.8 - 穩定 1.0 軌道 API。** root entry 是公開 API。
+> **狀態：0.5.9 - 穩定 1.0 軌道 API。** root entry 是公開 API。
 
 ## 安裝
 
diff --git a/llms-full.txt b/llms-full.txt
index dc6250e..9546cb3 100644
--- a/llms-full.txt
+++ b/llms-full.txt
@@ -15,7 +15,7 @@ The short index lives at `llms.txt` (see https://llmstxt.org/).
 
 Tiny strict object pool for hot acquire/release paths: sprites, bullets, particles, DOM nodes, and worker slots.
 
-> **Status: 0.5.8 - stable 1.0-track surface.** The root entry is the public API.
+> **Status: 0.5.9 - stable 1.0-track surface.** The root entry is the public API.
 
 ## Install
 
@@ -101,6 +101,10 @@ All notable changes to aipooljs are summarized here.
 
 ## [Unreleased]
 
+## [0.5.9] - 2026-06-29
+
+- Family version alignment at 0.5.9 — no runtime or API change.
+
 ## [0.5.8] - 2026-06-14
 
 - Documentation-only slimming pass across README, stability notes, review backlog, and LLM context. Family version alignment at 0.5.8 — no runtime or API change. A stricter overflow-handler mode that prevents aliasing by default remains a documented follow-up.
diff --git a/package.json b/package.json
index 1a60ec7..c0ed8fd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "aipooljs",
-  "version": "0.5.8",
+  "version": "0.5.9",
   "description": "Tiny, strict object pool for high-frequency acquire/release patterns — PixiJS sprite pools, bullet pools, particle pools, DOM node recyclers, worker job slots. Fixed-size, fail-fast on overflow, double-release detection.",
   "keywords": [
     "object-pool",