diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..2bd5a0a
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/README.md b/README.md
index feda7e3..efe37d8 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,8 @@ accentFoldedHighlight('Fulanilo López', 'lo', 'strong'); // --> "Fulani<strong>
 
 Contributions are welcome! Please feel free to submit a Pull Request.
 
+**Development requires Node.js ≥22** (ESLint v10 constraint). The published package supports Node.js ≥18 for consumers.
+
 ## Credits
 
 The initial idea came from the article [Accent Folding for Auto-Complete](https://alistapart.com/article/accent-folding-for-auto-complete/) by Carlos Bueno on A List Apart (February 2010). This library has since grown beyond that original concept, but the credit belongs there.
diff --git a/package.json b/package.json
index 5272e5f..06a7839 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,13 @@
   "engines": {
     "node": ">=18"
   },
+  "devEngines": {
+    "runtime": {
+      "name": "node",
+      "version": ">=22.0.0",
+      "onFail": "warn"
+    }
+  },
   "type": "module",
   "scripts": {
     "coverage": "vitest run --coverage",