diff --git a/lib/index.js b/lib/index.js
index c6bbc80..8085a99 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -40,7 +40,7 @@
 
 import path from 'node:path'
 import {PassThrough} from 'node:stream'
-import {fileURLToPath} from 'node:url'
+import {fileURLToPath, pathToFileURL} from 'node:url'
 import {findUp, pathExists} from 'find-up'
 import {loadPlugin} from 'load-plugin'
 import {engine} from 'unified-engine'
@@ -79,8 +79,8 @@ function vfileMessageToDiagnostic(message) {
     message.fatal === true
       ? DiagnosticSeverity.Error
       : message.fatal === false
-      ? DiagnosticSeverity.Warning
-      : DiagnosticSeverity.Information,
+        ? DiagnosticSeverity.Warning
+        : DiagnosticSeverity.Information,
     message.ruleId || undefined,
     message.source || undefined
   )
@@ -196,7 +196,7 @@ export function createUnifiedLanguageServer({
     try {
       processor = /** @type {EngineOptions['processor']} */ (
         await loadPlugin(processorName, {
-          cwd,
+          from: pathToFileURL(cwd + '/'),
           key: processorSpecifier
         })
       )
@@ -290,15 +290,17 @@ export function createUnifiedLanguageServer({
         let cwd
         if (workspaces.size === 0) {
           cwd = await findUp(
-            async (dir) => {
-              const pkgExists = await pathExists(path.join(dir, 'package.json'))
-              if (pkgExists) {
-                return dir
+            async (directory) => {
+              const packageExists = await pathExists(
+                path.join(directory, 'package.json')
+              )
+              if (packageExists) {
+                return directory
               }
 
-              const gitExists = await pathExists(path.join(dir, '.git'))
+              const gitExists = await pathExists(path.join(directory, '.git'))
               if (gitExists) {
-                return dir
+                return directory
               }
             },
             {
diff --git a/package.json b/package.json
index 42a50e1..beff3f9 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
   ],
   "dependencies": {
     "find-up": "^6.0.0",
-    "load-plugin": "^5.0.0",
+    "load-plugin": "^6.0.0",
     "unified-engine": "^11.0.0",
     "unist-util-lsp": "^2.0.0",
     "vfile": "^6.0.0",
@@ -42,15 +42,15 @@
   },
   "devDependencies": {
     "@types/node": "^20.0.0",
-    "c8": "^8.0.0",
+    "c8": "^9.0.0",
     "prettier": "^3.0.0",
     "remark": "^15.0.0",
-    "remark-cli": "^11.0.0",
-    "remark-preset-wooorm": "^9.0.0",
+    "remark-cli": "^12.0.0",
+    "remark-preset-wooorm": "^10.0.0",
     "type-coverage": "^2.0.0",
     "typescript": "^5.0.0",
     "unified": "^11.0.0",
-    "xo": "^0.56.0"
+    "xo": "^0.58.0"
   },
   "scripts": {
     "prepack": "npm run build",
diff --git a/readme.md b/readme.md
index 7a5370b..4db9c02 100644
--- a/readme.md
+++ b/readme.md
@@ -12,22 +12,22 @@ Create a **[language server][]** based on **[unified][]** ecosystems.
 
 ## Contents
 
-*   [What is this?](#what-is-this)
-*   [When should I use this?](#when-should-i-use-this)
-*   [Install](#install)
-*   [Use](#use)
-*   [API](#api)
-    *   [`createUnifiedLanguageServer(options)`](#createunifiedlanguageserveroptions)
-*   [Examples](#examples)
-*   [Types](#types)
-*   [Language Server features](#language-server-features)
-    *   [Watching files](#watching-files)
-    *   [Requests](#requests)
-    *   [Configuration](#configuration)
-*   [Compatibility](#compatibility)
-*   [Related](#related)
-*   [Contribute](#contribute)
-*   [License](#license)
+* [What is this?](#what-is-this)
+* [When should I use this?](#when-should-i-use-this)
+* [Install](#install)
+* [Use](#use)
+* [API](#api)
+  * [`createUnifiedLanguageServer(options)`](#createunifiedlanguageserveroptions)
+* [Examples](#examples)
+* [Types](#types)
+* [Language Server features](#language-server-features)
+  * [Watching files](#watching-files)
+  * [Requests](#requests)
+  * [Configuration](#configuration)
+* [Compatibility](#compatibility)
+* [Related](#related)
+* [Contribute](#contribute)
+* [License](#license)
 
 ## What is this?
 
@@ -35,10 +35,10 @@ This package exports a function which can be used to create a
 [language server][] based on [unified][] processors.
 It can do the following:
 
-*   format documents based on a unified processor
-*   validate documents based on a unified processor
-*   support configuration files (such as `.remarkrc`) using
-    [`unified-engine`][unified-engine]
+* format documents based on a unified processor
+* validate documents based on a unified processor
+* support configuration files (such as `.remarkrc`) using
+  [`unified-engine`][unified-engine]
 
 **unified** is a project that validates and transforms content with abstract
 syntax trees (ASTs).
@@ -58,7 +58,7 @@ various editors.
 
 ## Install
 
-This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).
+This package is [ESM only][].
 In Node.js (version 16.0+), install with [npm][]:
 
 ```sh
@@ -162,11 +162,11 @@ Name of configuration files to load (`string`, optional).
 
 For examples, see the following projects:
 
-*   `redot-language-server`
-    (coming soon)
-*   `rehype-language-server`
-    (coming soon)
-*   [`remark-language-server`](https://github.com/remarkjs/remark-language-server)
+* `redot-language-server`
+  (coming soon)
+* `rehype-language-server`
+  (coming soon)
+* [`remark-language-server`](https://github.com/remarkjs/remark-language-server)
 
 ## Types
 
@@ -187,39 +187,39 @@ change was made.
 Language servers created using this package implement the following language
 server features:
 
-*   `textDocument/codeAction`
-    — the language server implements code actions based on the `expected` field
-    on reported messages.
-    A code action can either insert, replace, or delete text based on the range
-    of the message and the expected value.
-*   `textDocument/didChange`
-    — when a document is changed by the client, the language server processes it
-    using a unified pipeline.
-    Any messages collected are published to the client using
-    `textDocument/publishDiagnostics`.
-*   `textDocument/didClose`
-    — when a document is closed by the client, the language server resets
-    diagnostics by publishing an empty array using
-    `textDocument/publishDiagnostics`.
-*   `textDocument/didOpen`
-    — when a document is opened by the client, the language server processes it
-    using a unified pipeline.
-    Any messages collected are published to the client using
-    `textDocument/publishDiagnostics`.
-*   `textDocument/formatting`
-    — when document formatting is requested by the client, the language server
-    processes it using a unified pipeline.
-    The stringified result is returned.
-*   `workspace/didChangeWatchedFiles` and `workspace/didChangeWorkspaceFolders`
-    — when the client signals a watched file or workspace has changed, the
-    language server processes all open files using a unified pipeline.
-    Any messages collected are published to the client using
-    `textDocument/publishDiagnostics`.
+* `textDocument/codeAction`
+  — the language server implements code actions based on the `expected` field
+  on reported messages.
+  A code action can either insert, replace, or delete text based on the range
+  of the message and the expected value.
+* `textDocument/didChange`
+  — when a document is changed by the client, the language server processes it
+  using a unified pipeline.
+  Any messages collected are published to the client using
+  `textDocument/publishDiagnostics`.
+* `textDocument/didClose`
+  — when a document is closed by the client, the language server resets
+  diagnostics by publishing an empty array using
+  `textDocument/publishDiagnostics`.
+* `textDocument/didOpen`
+  — when a document is opened by the client, the language server processes it
+  using a unified pipeline.
+  Any messages collected are published to the client using
+  `textDocument/publishDiagnostics`.
+* `textDocument/formatting`
+  — when document formatting is requested by the client, the language server
+  processes it using a unified pipeline.
+  The stringified result is returned.
+* `workspace/didChangeWatchedFiles` and `workspace/didChangeWorkspaceFolders`
+  — when the client signals a watched file or workspace has changed, the
+  language server processes all open files using a unified pipeline.
+  Any messages collected are published to the client using
+  `textDocument/publishDiagnostics`.
 
 ### Configuration
 
-*   `requireConfig` (default: `false`)
-    — If true, files will only be checked if a configuration file is present.
+* `requireConfig` (default: `false`)
+  — If true, files will only be checked if a configuration file is present.
 
 ## Compatibility
 
@@ -234,10 +234,10 @@ It should work anywhere where LSP 3.6.0 or later is implemented.
 
 ## Related
 
-*   [`unified`](https://github.com/unifiedjs/unified)
-    — create pipeline for working with syntax trees
-*   [`unified-args`](https://github.com/unifiedjs/unified-args)
-    — create a CLI for a unified pipeline
+* [`unified`](https://github.com/unifiedjs/unified)
+  — create pipeline for working with syntax trees
+* [`unified-args`](https://github.com/unifiedjs/unified-args)
+  — create a CLI for a unified pipeline
 
 ## Contribute
 
@@ -267,6 +267,8 @@ abide by its terms.
 
 [downloads]: https://www.npmjs.com/package/unified-language-server
 
+[esm only]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
 [size-badge]: https://img.shields.io/bundlephobia/minzip/unified-language-server.svg
 
 [size]: https://bundlephobia.com/result?p=unified-language-server
diff --git a/test/index.js b/test/index.js
index d33ce89..d7a2a2a 100644
--- a/test/index.js
+++ b/test/index.js
@@ -981,7 +981,7 @@ function cleanStack(stack, max) {
  * @param relativeCwd The cwd to use for the process relative to this test file.
  */
 function startLanguageServer(serverFilePath, relativeCwd = './') {
-  const bin = fileURLToPath(new URL(serverFilePath, import.meta.url))
+  const binary = fileURLToPath(new URL(serverFilePath, import.meta.url))
   const cwd = new URL(relativeCwd, import.meta.url)
 
   // Using ipc is useful for debugging. This allows logging in the language
@@ -989,20 +989,23 @@ function startLanguageServer(serverFilePath, relativeCwd = './') {
   // Enabling this breaks code coverage
   // https://github.com/bcoe/c8/issues/189
   if (process.argv.includes('--ipc')) {
-    const proc = spawn('node', [bin, '--node-ipc'], {
+    const serverProcess = spawn('node', [binary, '--node-ipc'], {
       cwd,
       stdio: [null, 'inherit', 'inherit', 'ipc']
     })
     connection = createProtocolConnection(
-      new IPCMessageReader(proc),
-      new IPCMessageWriter(proc)
+      new IPCMessageReader(serverProcess),
+      new IPCMessageWriter(serverProcess)
     )
     connection.onDispose(() => {
-      proc.kill()
+      serverProcess.kill()
     })
   } else {
-    const proc = spawn('node', [bin, '--stdio'], {cwd})
-    connection = createProtocolConnection(proc.stdout, proc.stdin)
+    const serverProcess = spawn('node', [binary, '--stdio'], {cwd})
+    connection = createProtocolConnection(
+      serverProcess.stdout,
+      serverProcess.stdin
+    )
   }
 
   connection.onDispose(() => {