diff --git a/client/package-lock.json b/client/package-lock.json
index f08015f0..3e6a27e4 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -43,6 +43,33 @@
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@@ -236,6 +260,15 @@
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@@ -299,11 +331,28 @@
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-      "dev": true
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+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.11.0.tgz",
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@@ -323,6 +395,46 @@
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@@ -429,17 +549,67 @@
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@@ -479,12 +657,58 @@
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@@ -509,6 +733,11 @@
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+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
+    },
     "v8-compile-cache": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz",
       "integrity": "sha512-gTpR5XQNKFwOd4clxfnhaqvfqMpqEwr4tOtCyz4MtYZX2JYhfr1JvBFKdS+7K/9rfpZR3VLX+YWBbKoxCgS43Q==",
       "dev": true
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
     "vscode-jsonrpc": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-5.0.1.tgz",
-      "integrity": "sha512-JvONPptw3GAQGXlVV2utDcHx0BiY34FupW/kI6mZ5x06ER5DdPG/tXWMVHjTNULF5uKPOUUD0SaXg5QaubJL0A=="
+      "version": "6.0.0-next.7",
+      "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-6.0.0-next.7.tgz",
+      "integrity": "sha512-1nG+6cuTtpzmXe7yYfO9GCkYlyV6Ai+jDnwidHiT2T7zhc+bJM+VTtc0T/CdTlDyTNTqIcCj0V1nD4TcVjJ7Ug=="
     },
     "vscode-languageclient": {
-      "version": "6.1.3",
-      "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-6.1.3.tgz",
-      "integrity": "sha512-YciJxk08iU5LmWu7j5dUt9/1OLjokKET6rME3cI4BRpiF6HZlusm2ZwPt0MYJ0lV5y43sZsQHhyon2xBg4ZJVA==",
+      "version": "7.0.0-next.14",
+      "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-7.0.0-next.14.tgz",
+      "integrity": "sha512-QUccfXK2F6AXXRFR8QJCaIz7N2BhJK6ok8E1aO8LHq2IBU33+5hTSJBXs7nEqrqZ/cY2VlDDbMWtMvCxz+/y1w==",
       "requires": {
         "semver": "^6.3.0",
+        "vscode-languageserver-protocol": "3.16.0-next.11"
+      }
+    },
+    "vscode-languageserver": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver/-/vscode-languageserver-6.1.1.tgz",
+      "integrity": "sha512-DueEpkUAkD5XTR4MLYNr6bQIp/UFR0/IPApgXU3YfCBCB08u2sm9hRCs6DxYZELkk++STPjpcjksR2H8qI3cDQ==",
+      "requires": {
         "vscode-languageserver-protocol": "^3.15.3"
+      },
+      "dependencies": {
+        "vscode-jsonrpc": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-5.0.1.tgz",
+          "integrity": "sha512-JvONPptw3GAQGXlVV2utDcHx0BiY34FupW/kI6mZ5x06ER5DdPG/tXWMVHjTNULF5uKPOUUD0SaXg5QaubJL0A=="
+        },
+        "vscode-languageserver-protocol": {
+          "version": "3.15.3",
+          "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.15.3.tgz",
+          "integrity": "sha512-zrMuwHOAQRhjDSnflWdJG+O2ztMWss8GqUUB8dXLR/FPenwkiBNkMIJJYfSN6sgskvsF0rHAoBowNQfbyZnnvw==",
+          "requires": {
+            "vscode-jsonrpc": "^5.0.1",
+            "vscode-languageserver-types": "3.15.1"
+          }
+        },
+        "vscode-languageserver-types": {
+          "version": "3.15.1",
+          "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.15.1.tgz",
+          "integrity": "sha512-+a9MPUQrNGRrGU630OGbYVQ+11iOIovjCkqxajPa9w57Sd5ruK8WQNsslzpa0x/QJqC8kRc2DUxWjIFwoNm4ZQ=="
+        }
       }
     },
     "vscode-languageserver-protocol": {
-      "version": "3.15.3",
-      "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.15.3.tgz",
-      "integrity": "sha512-zrMuwHOAQRhjDSnflWdJG+O2ztMWss8GqUUB8dXLR/FPenwkiBNkMIJJYfSN6sgskvsF0rHAoBowNQfbyZnnvw==",
+      "version": "3.16.0-next.11",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.16.0-next.11.tgz",
+      "integrity": "sha512-31FmupmSmfznuMuGp7qN6h3d/hKUbexbvcwTvrUE/igqRlzFU542s8MtGICx1ERbVuDOLGp96W2Z92qbUbmBPA==",
       "requires": {
-        "vscode-jsonrpc": "^5.0.1",
-        "vscode-languageserver-types": "3.15.1"
+        "vscode-jsonrpc": "6.0.0-next.7",
+        "vscode-languageserver-types": "3.16.0-next.5"
       }
     },
+    "vscode-languageserver-textdocument": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-textdocument/-/vscode-languageserver-textdocument-1.0.1.tgz",
+      "integrity": "sha512-UIcJDjX7IFkck7cSkNNyzIz5FyvpQfY7sdzVy+wkKN/BLaD4DQ0ppXQrKePomCxTS7RrolK1I0pey0bG9eh8dA=="
+    },
     "vscode-languageserver-types": {
-      "version": "3.15.1",
-      "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.15.1.tgz",
-      "integrity": "sha512-+a9MPUQrNGRrGU630OGbYVQ+11iOIovjCkqxajPa9w57Sd5ruK8WQNsslzpa0x/QJqC8kRc2DUxWjIFwoNm4ZQ=="
+      "version": "3.16.0-next.5",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.16.0-next.5.tgz",
+      "integrity": "sha512-lf8Y1XXMtF1r2oDDAmJe+drizNXkybSRXAQQk5dPy2rYJsY9SPXYNO074L3THu9zNYepzV5fRJZUPo/V/TLBRQ=="
     },
     "vscode-test": {
       "version": "1.4.1",
@@ -1417,11 +2417,20 @@
         "rimraf": "^2.6.3"
       }
     },
+    "vscode-uri": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/vscode-uri/-/vscode-uri-2.1.2.tgz",
+      "integrity": "sha512-8TEXQxlldWAuIODdukIb+TR5s+9Ds40eSJrw+1iDDA9IFORPjMELarNQE3myz5XIkWWpdprmJjm1/SxMlWOC8A=="
+    },
+    "web-tree-sitter": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/web-tree-sitter/-/web-tree-sitter-0.17.1.tgz",
+      "integrity": "sha512-QgaeV+wmlB1Qaw9rS5a0ZDBt8GRcKkF+hGNSVxQ/HLm1lPCow3BKOhoILaXkYm7YozCcL7TjppRADBwFJugbuA=="
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -1435,8 +2444,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "write": {
       "version": "1.0.3",
@@ -1446,6 +2454,28 @@
       "requires": {
         "mkdirp": "^0.5.1"
       }
+    },
+    "ws": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.1.tgz",
+      "integrity": "sha512-8A/uRMnQy8KCQsmep1m7Bk+z/+LIkeF7w+TDMLtX1iZm5Hq9HsUDmgFGaW1ACW5Cj0b2Qo7wCvRhYN2ErUVp/A==",
+      "requires": {
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
+      },
+      "dependencies": {
+        "ultron": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
+          "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og=="
+        }
+      }
+    },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     }
   }
 }
diff --git a/client/package.json b/client/package.json
index eebb4665..6687ef90 100644
--- a/client/package.json
+++ b/client/package.json
@@ -17,7 +17,8 @@
     "lint": "eslint -c .eslintrc.js --ext .ts src"
   },
   "dependencies": {
-    "vscode-languageclient": "^6.1.3"
+    "@elm-tooling/elm-language-server": "^1.13.2",
+    "vscode-languageclient": "^7.0.0-next.14"
   },
   "devDependencies": {
     "@types/request": "^2.48.5",
diff --git a/client/src/cancellation.ts b/client/src/cancellation.ts
new file mode 100644
index 00000000..44607ba2
--- /dev/null
+++ b/client/src/cancellation.ts
@@ -0,0 +1,96 @@
+import { randomBytes } from "crypto";
+import * as fs from "fs";
+import * as os from "os";
+import { Disposable } from "vscode";
+import {
+  CancellationId,
+  CancellationReceiverStrategy,
+  CancellationSenderStrategy,
+  CancellationStrategy,
+  MessageConnection,
+} from "vscode-languageclient";
+import path = require("path");
+
+function getCancellationFolderPath(folderName: string) {
+  return path.join(os.tmpdir(), "elm-language-server-cancellation", folderName);
+}
+
+function getCancellationFilePath(
+  folderName: string,
+  id: CancellationId,
+): string {
+  return path.join(
+    getCancellationFolderPath(folderName),
+    `cancellation-${String(id)}.tmp`,
+  );
+}
+
+function tryRun(callback: () => void) {
+  try {
+    callback();
+  } catch (e) {
+    /* empty */
+  }
+}
+
+class FileCancellationSenderStrategy implements CancellationSenderStrategy {
+  constructor(readonly folderName: string) {
+    const folder = getCancellationFolderPath(folderName);
+    tryRun(() => fs.mkdirSync(folder, { recursive: true }));
+  }
+
+  sendCancellation(_: MessageConnection, id: CancellationId): void {
+    const file = getCancellationFilePath(this.folderName, id);
+    tryRun(() => fs.writeFileSync(file, "", { flag: "w" }));
+  }
+
+  cleanup(id: CancellationId): void {
+    tryRun(() => fs.unlinkSync(getCancellationFilePath(this.folderName, id)));
+  }
+
+  dispose(): void {
+    const folder = getCancellationFolderPath(this.folderName);
+    tryRun(() => rimraf(folder));
+
+    function rimraf(location: string) {
+      const stat = fs.lstatSync(location);
+      if (stat) {
+        if (stat.isDirectory() && !stat.isSymbolicLink()) {
+          for (const dir of fs.readdirSync(location)) {
+            rimraf(path.join(location, dir));
+          }
+
+          fs.rmdirSync(location);
+        } else {
+          fs.unlinkSync(location);
+        }
+      }
+    }
+  }
+}
+
+export class FileBasedCancellationStrategy
+  implements CancellationStrategy, Disposable {
+  private _sender: FileCancellationSenderStrategy;
+
+  constructor() {
+    const folderName = randomBytes(21).toString("hex");
+    this._sender = new FileCancellationSenderStrategy(folderName);
+  }
+
+  get receiver(): CancellationReceiverStrategy {
+    return CancellationReceiverStrategy.Message;
+  }
+
+  get sender(): CancellationSenderStrategy {
+    return this._sender;
+  }
+
+  getCommandLineArguments(): string[] {
+    return [`--cancellationReceive=file:${this._sender.folderName}`];
+  }
+
+  dispose(): void {
+    this._sender.dispose();
+  }
+}
diff --git a/client/src/exposeUnexposeAction.ts b/client/src/exposeUnexposeAction.ts
index e3da13e3..913400de 100644
--- a/client/src/exposeUnexposeAction.ts
+++ b/client/src/exposeUnexposeAction.ts
@@ -1,10 +1,6 @@
-import { LanguageClient } from "vscode-languageclient";
+import { LanguageClient } from "vscode-languageclient/node";
 import { ExtensionContext, commands } from "vscode";
-import {
-  ExposeRequest,
-  UnexposeRequest,
-  IExposeUnexposeParams,
-} from "./protocol";
+import { Protocol } from "@elm-tooling/elm-language-server";
 
 export function registerCommands(
   languageClient: LanguageClient,
@@ -13,7 +9,7 @@ export function registerCommands(
   context.subscriptions.push(
     commands.registerCommand(
       "elm.expose",
-      async (params: IExposeUnexposeParams) => {
+      async (params: Protocol.IExposeUnexposeParams) => {
         await expose(languageClient, params);
       },
     ),
@@ -22,7 +18,7 @@ export function registerCommands(
   context.subscriptions.push(
     commands.registerCommand(
       "elm.unexpose",
-      async (params: IExposeUnexposeParams) => {
+      async (params: Protocol.IExposeUnexposeParams) => {
         await unexpose(languageClient, params);
       },
     ),
@@ -31,14 +27,14 @@ export function registerCommands(
 
 async function expose(
   languageClient: LanguageClient,
-  params: IExposeUnexposeParams,
+  params: Protocol.IExposeUnexposeParams,
 ) {
-  await languageClient.sendRequest(ExposeRequest, params);
+  await languageClient.sendRequest(Protocol.ExposeRequest, params);
 }
 
 async function unexpose(
   languageClient: LanguageClient,
-  params: IExposeUnexposeParams,
+  params: Protocol.IExposeUnexposeParams,
 ) {
-  await languageClient.sendRequest(UnexposeRequest, params);
+  await languageClient.sendRequest(Protocol.UnexposeRequest, params);
 }
diff --git a/client/src/extension.ts b/client/src/extension.ts
index 0cfb2ddd..84247535 100644
--- a/client/src/extension.ts
+++ b/client/src/extension.ts
@@ -15,20 +15,25 @@ import {
   WorkspaceFolder,
 } from "vscode";
 import {
-  LanguageClient,
   LanguageClientOptions,
   Middleware,
   ResolveCodeLensSignature,
   RevealOutputChannelOn,
-  TransportKind,
   ProvideCodeLensesSignature,
   DidChangeConfigurationNotification,
+  Disposable,
 } from "vscode-languageclient";
+import {
+  LanguageClient,
+  ServerOptions,
+  TransportKind,
+} from "vscode-languageclient/node";
 import * as Package from "./elmPackage";
 import * as RefactorAction from "./refactorAction";
 import * as ExposeUnexposeAction from "./exposeUnexposeAction";
 import * as Restart from "./restart";
-import { OnDidCreateFilesRequest, OnDidRenameFilesRequest } from "./protocol";
+import { Protocol } from "@elm-tooling/elm-language-server";
+import { FileBasedCancellationStrategy } from "./cancellation";
 
 export type ElmAnalyseTrigger = "change" | "save" | "never";
 
@@ -83,6 +88,8 @@ function getOuterMostWorkspaceFolder(
   return folder;
 }
 
+const disposables: Disposable[] = [];
+
 export function activate(context: ExtensionContext): void {
   const module = context.asAbsolutePath(path.join("server", "out", "index.js"));
 
@@ -114,16 +121,24 @@ export function activate(context: ExtensionContext): void {
         relativeWorkspace.length > 0 ? `Elm (${relativeWorkspace})` : "Elm",
       );
 
+      const cancellationStrategy = new FileBasedCancellationStrategy();
+      disposables.push(cancellationStrategy);
+
       const debugOptions = {
         execArgv: ["--nolazy", `--inspect=${6010 + clients.size}`],
       };
-      const serverOptions = {
+      const serverOptions: ServerOptions = {
         debug: {
           module,
           options: debugOptions,
           transport: TransportKind.ipc,
+          args: cancellationStrategy.getCommandLineArguments(),
+        },
+        run: {
+          module,
+          transport: TransportKind.ipc,
+          args: cancellationStrategy.getCommandLineArguments(),
         },
-        run: { module, transport: TransportKind.ipc },
       };
       const clientOptions: LanguageClientOptions = {
         diagnosticCollectionName: "Elm",
@@ -143,6 +158,9 @@ export function activate(context: ExtensionContext): void {
         progressOnInitialization: true,
         revealOutputChannelOn: RevealOutputChannelOn.Never,
         workspaceFolder: folder,
+        connectionOptions: {
+          cancellationStrategy,
+        },
       };
       const client = new LanguageClient(
         "elmLS",
@@ -173,7 +191,8 @@ export function activate(context: ExtensionContext): void {
   Workspace.onDidCreateFiles((e) => {
     if (e.files.some((file) => file.toString().endsWith(".elm"))) {
       clients.forEach(
-        (client) => void client.sendRequest(OnDidCreateFilesRequest, e),
+        (client) =>
+          void client.sendRequest(Protocol.OnDidCreateFilesRequest, e),
       );
     }
   });
@@ -181,7 +200,8 @@ export function activate(context: ExtensionContext): void {
   Workspace.onDidRenameFiles((e) => {
     if (e.files.some(({ newUri }) => newUri.toString().endsWith(".elm"))) {
       clients.forEach(
-        (client) => void client.sendRequest(OnDidRenameFilesRequest, e),
+        (client) =>
+          void client.sendRequest(Protocol.OnDidRenameFilesRequest, e),
       );
     }
   });
@@ -223,6 +243,7 @@ export function activate(context: ExtensionContext): void {
 }
 
 export function deactivate(): Thenable<void> | undefined {
+  disposables.forEach((d) => d.dispose());
   const promises: Thenable<void>[] = [];
   for (const client of clients.values()) {
     promises.push(client.stop());
diff --git a/client/src/protocol.ts b/client/src/protocol.ts
deleted file mode 100644
index abb37441..00000000
--- a/client/src/protocol.ts
+++ /dev/null
@@ -1,66 +0,0 @@
-import { FileCreateEvent, FileRenameEvent, Uri } from "vscode";
-import { CodeActionParams, RequestType } from "vscode-languageclient";
-
-export const GetMoveDestinationRequest = new RequestType<
-  IMoveParams,
-  IMoveDestinationsResponse,
-  void,
-  void
->("elm/getMoveDestinations");
-
-export const MoveRequest = new RequestType<IMoveParams, void, void, void>(
-  "elm/move",
-);
-
-export interface IMoveParams {
-  sourceUri: string;
-  params: CodeActionParams;
-  destination?: IMoveDestination;
-}
-
-export interface IMoveDestinationsResponse {
-  destinations: IMoveDestination[];
-}
-
-export interface IMoveDestination {
-  name: string;
-  path: string;
-  uri: string;
-}
-
-export const ExposeRequest = new RequestType<
-  IExposeUnexposeParams,
-  void,
-  void,
-  void
->("elm/expose");
-
-export interface IExposeUnexposeParams {
-  uri: string;
-  name: string;
-}
-
-export const UnexposeRequest = new RequestType<
-  IExposeUnexposeParams,
-  void,
-  void,
-  void
->("elm/unexpose");
-
-export interface IOnDidCreateFilesParams {
-  files: ReadonlyArray<Uri>;
-}
-
-export const OnDidCreateFilesRequest = new RequestType<
-  FileCreateEvent,
-  void,
-  void,
-  void
->("elm/ondidCreateFiles");
-
-export const OnDidRenameFilesRequest = new RequestType<
-  FileRenameEvent,
-  void,
-  void,
-  void
->("elm/ondidRenameFiles");
diff --git a/client/src/refactorAction.ts b/client/src/refactorAction.ts
index b1dbf38e..968ff9c1 100644
--- a/client/src/refactorAction.ts
+++ b/client/src/refactorAction.ts
@@ -1,6 +1,7 @@
 import { commands, ExtensionContext, window } from "vscode";
-import { CodeActionParams, LanguageClient } from "vscode-languageclient";
-import { GetMoveDestinationRequest, MoveRequest } from "./protocol";
+import { CodeActionParams } from "vscode-languageclient";
+import { LanguageClient } from "vscode-languageclient/node";
+import { Protocol } from "@elm-tooling/elm-language-server";
 
 export function registerCommands(
   languageClient: LanguageClient,
@@ -28,7 +29,7 @@ async function moveFunction(
   commandInfo: string,
 ) {
   const moveDestinations = await languageClient.sendRequest(
-    GetMoveDestinationRequest,
+    Protocol.GetMoveDestinationRequest,
     {
       sourceUri: params.textDocument.uri,
       params,
@@ -65,7 +66,7 @@ async function moveFunction(
     return;
   }
 
-  await languageClient.sendRequest(MoveRequest, {
+  await languageClient.sendRequest(Protocol.MoveRequest, {
     sourceUri: params.textDocument.uri,
     params,
     destination: selected.destination,
diff --git a/client/src/restart.ts b/client/src/restart.ts
index c33eec4f..6a84e8b6 100644
--- a/client/src/restart.ts
+++ b/client/src/restart.ts
@@ -1,6 +1,6 @@
 "use strict";
 import * as vscode from "vscode";
-import { LanguageClient } from "vscode-languageclient";
+import { LanguageClient } from "vscode-languageclient/node";
 
 export function registerCommand(
   langClients: Map<string, LanguageClient>,