diff --git a/.github/actions/setup-toolchain/action.yaml b/.github/actions/setup-toolchain/action.yaml
index 47de1c4..2872473 100644
--- a/.github/actions/setup-toolchain/action.yaml
+++ b/.github/actions/setup-toolchain/action.yaml
@@ -7,7 +7,7 @@ runs:
     - name: Setup Node.js
       uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
       with:
-        node-version: 22.22.1
+        node-version: 24.19.0
         package-manager-cache: false
 
     - name: Setup aube
diff --git a/AGENTS.md b/AGENTS.md
index a2d907e..cc3f796 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -11,7 +11,7 @@ These instructions apply to humans and coding agents working in this repository.
 
 ## Toolchain
 
-- Use Node.js 22.18 or newer and the aube version pinned in `package.json`. `mise.toml` pins both for local setup.
+- Use Node.js 24.2 or newer and the aube version pinned in `package.json`. `mise.toml` pins both for local setup.
 - Use aube for dependencies and scripts. It reads and writes `pnpm-lock.yaml` and `pnpm-workspace.yaml` in place; keep both files and do not create npm, Yarn, or Bun lockfiles.
 - `typescript` is overridden to `typescript-native-bridge` in `pnpm-workspace.yaml`, so `tsc` and every Compiler API consumer type-check on tsgo. Keep the pin exact and reinstall after changing it.
 - Use Turborepo through the root scripts; do not duplicate orchestration in package scripts.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d488e9e..456e811 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -10,7 +10,7 @@ Participation is governed by the [Code of Conduct](CODE_OF_CONDUCT.md), and proj
 
 Requirements:
 
-- Node.js 22.18 or newer
+- Node.js 24.2 or newer
 - [aube](https://aube.jdx.dev), the pinned package manager
 - Git
 
diff --git a/README.md b/README.md
index a5e43f4..0c79a62 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ Adapters depend on the runtime; the runtime never depends on adapters. See [docs
 
 ## Quick start
 
-Requirements: Node.js 22.18+ and [aube](https://aube.jdx.dev), the package manager pinned in `package.json`. Both are pinned in `mise.toml`, so [mise](https://mise.jdx.dev) can install them together. Generated Node.js bundles target Node.js 20.11+.
+Requirements: Node.js 24.2+ and [aube](https://aube.jdx.dev), the package manager pinned in `package.json`. Both are pinned in `mise.toml`, so [mise](https://mise.jdx.dev) can install them together. Generated Node.js bundles target Node.js 24.2+.
 
 ```bash
 mise install            # or: npm install -g --ignore-scripts=false @endevco/aube
diff --git a/mise.toml b/mise.toml
index 17a83dd..33414d1 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,3 +1,3 @@
 [tools]
-node = "22.22.1"
+node = "24.19.0"
 aube = "1.38.0"
diff --git a/package.json b/package.json
index d8d05e0..23d0d97 100644
--- a/package.json
+++ b/package.json
@@ -49,7 +49,7 @@
     "*.{js,mjs,cjs,ts,tsx,json,jsonc,yaml,yml,md}": "oxfmt --write --no-error-on-unmatched-pattern"
   },
   "engines": {
-    "node": ">=22.18"
+    "node": ">=24.2"
   },
   "packageManager": "aube@1.38.0"
 }
diff --git a/scripts/tsdown.config.ts b/scripts/tsdown.config.ts
index dd79315..f6aa0d1 100644
--- a/scripts/tsdown.config.ts
+++ b/scripts/tsdown.config.ts
@@ -4,7 +4,7 @@ import { defineConfig, type OutExtensionContext, type UserConfig } from 'tsdown'
 const baseConfig = {
   entry: ['src/index.ts'],
   platform: 'node',
-  target: 'node20.11',
+  target: 'node24.2',
   outDir: 'dist',
   clean: true,
   sourcemap: true,
@@ -25,6 +25,13 @@ const baseConfig = {
 const packageConfig = {
   ...baseConfig,
   format: ['esm', 'cjs'],
+  checks: {
+    ...baseConfig.checks,
+    // Packages intentionally dual-publish ESM and CJS. With a node24.2 target
+    // (which supports require(esm)), tsdown escalates its legacy-CJS
+    // recommendation to an error under failOnWarn, so opt out of that check.
+    legacyCjs: false,
+  },
   outExtensions: (context: OutExtensionContext) => ({
     js: context.format === 'es' ? '.mjs' : '.cjs',
     dts: context.format === 'es' ? '.d.mts' : '.d.cts',