diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 77e552c..b8ed4bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [16.x, 18.x, 20.x, 22.x]
+        node: [20.x, 22.x]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
diff --git a/.gitignore b/.gitignore
index 38cb1a3..d389a99 100644
--- a/.gitignore
+++ b/.gitignore
@@ -142,3 +142,4 @@ node_modules
 *-lock.*
 .vscode
 lib/
+.github/instructions/wmt-copilot.instructions.md
diff --git a/README.md b/README.md
index 6b04b87..12bf5b7 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url]
 
-This is an imaginatively named, configurable web server using Fastify atop Node.js.
+This is an imaginatively named, configurable web server using Fastify 5.x atop Node.js.
 
 The aim is to provide a standardized node web server that can be used to serve your web
 application without the need for duplicating from another example, or starting from scratch.
@@ -11,7 +11,7 @@ The intention is that you will extend via configuration, such that this provides
 functionality of a Fastify web server, and within your own application you will add on the
 features, logic, etc unique to your situation.
 
-This module requires Node v16.x.x+.
+This module requires Node v20.x.x+ and supports Fastify 5.x.
 
 ## Table Of Contents <!-- omit in toc -->
 
@@ -496,7 +496,7 @@ identity (no compression)
 
 ```js
 server: {
-  bodyLimit: 1048576; //new size limit
+  bodyLimit: 1048576 // new size limit in bytes (1MB)
 }
 ```
 
diff --git a/package.json b/package.json
index 3122cff..00a9894 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@xarc/fastify-server",
-  "version": "4.0.10",
+  "version": "5.0.0-beta.0",
   "description": "A configurable Fastify web server",
   "main": "lib/index.js",
   "types": "./lib/index.d",
@@ -45,19 +45,19 @@
   ],
   "license": "Apache-2.0",
   "engines": {
-    "node": ">= 14.0.0"
+    "node": ">= 22.0.0"
   },
   "files": [
     "lib",
     "src"
   ],
   "dependencies": {
-    "@fastify/static": "^7.0.4",
+    "@fastify/static": "^8.2.0",
     "async-eventemitter": "^0.2.4",
     "chalk": "^4.1.0",
     "electrode-confippet": "^1.7.0",
-    "fastify": "^4.29.0",
-    "fastify-plugin": "^4.5.0",
+    "fastify": "^5.6.1",
+    "fastify-plugin": "^5.0.1",
     "lodash": "^4.17.21",
     "require-at": "^1.0.6",
     "tslib": "^2.1.0",
@@ -68,7 +68,7 @@
     "@istanbuljs/nyc-config-typescript": "^1.0.1",
     "@types/jest": "^29.5.11",
     "@types/mocha": "^8.2.0",
-    "@types/node": "^14.14.16",
+    "@types/node": "^22.0.0",
     "@typescript-eslint/eslint-plugin": "^5.0.0",
     "@typescript-eslint/parser": "^5.0.0",
     "eslint": "^7.16.0",
@@ -78,7 +78,7 @@
     "jest": "^29.7.0",
     "mitm": "^1.2.0",
     "npm-run-all": "4.1.5",
-    "prettier": "3.2.4",
+    "prettier": "^3.6.0",
     "run-verify": "^1.2.1",
     "source-map-support": "^0.5.19",
     "superagent": "^9.0.2",
@@ -95,4 +95,4 @@
     ],
     "recursive": true
   }
-}
+}
\ No newline at end of file
diff --git a/src/types.ts b/src/types.ts
index 988f4ff..37fb0d9 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -94,10 +94,7 @@ export type {
 } from "fastify";
 /* eslint-enable max-len */
 
-export type ServerInfo = {
-  address: string;
-  port: number;
-};
+export type ServerInfo = { address: string; port: number };
 
 export interface ElectrodeFastifyInstance extends FastifyInstance {
   info: ServerInfo;
@@ -204,7 +201,27 @@ export type ElectrodeServerConfig = {
    * ```
    */
   plugins?: PluginsConfig;
-  /** options to be passed to fastify verbatim */
+  /**
+   * options to be passed to fastify verbatim
+   *
+   * **Note for Fastify 5 migration:**
+   * - `requestIdHeader` now defaults to `false` instead of `"request-id"`
+   * - Router options like `maxParamLength`, `ignoreTrailingSlash`, etc. should be
+   *   moved under `routerOptions` to avoid deprecation warnings
+   * - Example: 
+   * ```js
+   * {
+   *   server: {
+   *     requestIdHeader: false, // explicit default in Fastify 5
+   *     routerOptions: {
+   *       maxParamLength: 1000,
+   *       ignoreTrailingSlash: false,
+   *       caseSensitive: true
+   *     }
+   *   }
+   * }
+   * ```
+   */
   server?: FastifyServerOptions;
   /** settings specific to Electrode's add-ons for the fastify server */
   electrode?: ElectrodeOptions;
diff --git a/test/sample/index.js b/test/sample/index.js
index 9d3c76e..43f7a12 100644
--- a/test/sample/index.js
+++ b/test/sample/index.js
@@ -1,5 +1,3 @@
-/* eslint-disable */
-
 "use strict";
 const fastifyPlugin = require("fastify-plugin");
 const path = require("path");
@@ -60,4 +58,5 @@ const config = {
     });
   }
 };
-require("../../")(config);
+const { electrodeServer } = require("../../");
+electrodeServer(config);