diff --git a/CHANGELOG.md b/CHANGELOG.md
index b184d4b..46e05fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,13 +3,20 @@
 All notable changes to napi-mojo. The project is in alpha; minor versions may
 break the source API that downstream addons compile against.
 
-## Unreleased
+## 0.16.0 — 2026-09-17
 
-**Mojo 1.1.0 stable toolchain adoption** (`max = "==26.6.0"`, from Mojo 1.0.0 /
-`26.5.0`). Four source files changed; no public Mojo signature changed, so
-downstream addons compile unmodified. Full account in
+**Adopts the Mojo 1.1.0 stable toolchain** (`max = "==26.6.0"`, from Mojo
+1.0.0 / `26.5.0`). This is a minor rather than a patch for that reason alone:
+downstream addons compile against the published `src/`, so taking this upgrade
+moves them onto that toolchain. No public Mojo signature changed, so they
+compile unmodified once there. Full account in
 [`docs/toolchain-migrations.md`](docs/toolchain-migrations.md).
 
+**It also corrects every computed error message the framework produces.** Those
+trailed heap garbage in every release to date — see Fixed, below. Anything
+asserting on a type-mismatch message with a substring match will keep passing;
+anything comparing one whole will now see the message it expected.
+
 ### Fixed
 
 - **Every computed error message trailed heap garbage.** The eight
diff --git a/npm/darwin-arm64/package.json b/npm/darwin-arm64/package.json
index 84ccfcb..f72c75d 100644
--- a/npm/darwin-arm64/package.json
+++ b/npm/darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@napi-mojo/darwin-arm64",
-  "version": "0.15.1",
+  "version": "0.16.0",
   "description": "napi-mojo prebuilt binary for macOS arm64",
   "main": "index.node",
   "files": [
diff --git a/npm/linux-arm64/package.json b/npm/linux-arm64/package.json
index 009da64..3426b7d 100644
--- a/npm/linux-arm64/package.json
+++ b/npm/linux-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@napi-mojo/linux-arm64",
-  "version": "0.15.1",
+  "version": "0.16.0",
   "description": "napi-mojo prebuilt binary for Linux arm64",
   "main": "index.node",
   "files": [
diff --git a/npm/linux-x64/package.json b/npm/linux-x64/package.json
index eef5997..5f06fe9 100644
--- a/npm/linux-x64/package.json
+++ b/npm/linux-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@napi-mojo/linux-x64",
-  "version": "0.15.1",
+  "version": "0.16.0",
   "description": "napi-mojo prebuilt binary for Linux x64",
   "main": "index.node",
   "files": [
diff --git a/package-lock.json b/package-lock.json
index 9448958..0928623 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "napi-mojo",
-  "version": "0.15.1",
+  "version": "0.16.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "napi-mojo",
-      "version": "0.15.1",
+      "version": "0.16.0",
       "license": "MIT",
       "bin": {
         "napi-mojo": "bin/napi-mojo.mjs"
@@ -18,9 +18,9 @@
         "node": ">=22.12.0"
       },
       "optionalDependencies": {
-        "@napi-mojo/darwin-arm64": "0.15.1",
-        "@napi-mojo/linux-arm64": "0.15.1",
-        "@napi-mojo/linux-x64": "0.15.1"
+        "@napi-mojo/darwin-arm64": "0.16.0",
+        "@napi-mojo/linux-arm64": "0.16.0",
+        "@napi-mojo/linux-x64": "0.16.0"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -1092,7 +1092,7 @@
       }
     },
     "node_modules/@napi-mojo/darwin-arm64": {
-      "version": "0.15.1",
+      "version": "0.16.0",
       "cpu": [
         "arm64"
       ],
@@ -1103,7 +1103,7 @@
       ]
     },
     "node_modules/@napi-mojo/linux-arm64": {
-      "version": "0.15.1",
+      "version": "0.16.0",
       "cpu": [
         "arm64"
       ],
@@ -1114,7 +1114,7 @@
       ]
     },
     "node_modules/@napi-mojo/linux-x64": {
-      "version": "0.15.1",
+      "version": "0.16.0",
       "cpu": [
         "x64"
       ],
diff --git a/package.json b/package.json
index cbdb3f5..c8ec855 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "napi-mojo",
-  "version": "0.15.1",
+  "version": "0.16.0",
   "description": "Build Node.js native addons in Mojo — the Mojo equivalent of napi-rs",
   "main": "index.js",
   "types": "index.d.ts",
@@ -94,9 +94,9 @@
     "node-addon"
   ],
   "optionalDependencies": {
-    "@napi-mojo/darwin-arm64": "0.15.1",
-    "@napi-mojo/linux-arm64": "0.15.1",
-    "@napi-mojo/linux-x64": "0.15.1"
+    "@napi-mojo/darwin-arm64": "0.16.0",
+    "@napi-mojo/linux-arm64": "0.16.0",
+    "@napi-mojo/linux-x64": "0.16.0"
   },
   "devDependencies": {
     "jest": "^30.4.2"
diff --git a/pixi.toml b/pixi.toml
index c45d403..bfda0f0 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -3,7 +3,7 @@ authors = ["Wm Talcott <wtalcott@gmail.com>"]
 channels = ["conda-forge", "https://conda.modular.com/max/"]
 name = "napi-mojo"
 platforms = ["osx-arm64", "linux-64", "linux-aarch64"]
-version = "0.15.1"
+version = "0.16.0"
 
 [tasks]
 # WARNING: this rewrites only the `max = ` line, NOT the channel. Since the