diff --git a/src/common.ts b/src/common.ts
index d87973e3..15433792 100644
--- a/src/common.ts
+++ b/src/common.ts
@@ -16,9 +16,9 @@ import {
 } from "./providers/diagnostics/elmAnalyseJsonService";
 import { ILanguageServer } from "./server";
 import { DocumentEvents } from "./util/documentEvents";
-import { IClientSettings, Settings } from "./util/settings";
+import { Settings } from "./util/settings";
 import { TextDocumentEvents } from "./util/textDocumentEvents";
-import { IFileSystemHost } from "./types";
+import { IFileSystemHost, InitializationOptions } from "./types";
 import { URI, Utils } from "vscode-uri";
 
 export function startCommonServer(
@@ -45,7 +45,18 @@ export function startCommonServer(
 
   connection.onInitialize(
     async (params: InitializeParams): Promise<InitializeResult> => {
-      await Parser.init();
+      const initializationOptions =
+        <InitializationOptions>params.initializationOptions ?? {};
+
+      const options: object | undefined =
+        initializationOptions.treeSitterWasmUri
+          ? {
+              locateFile(): string | undefined {
+                return initializationOptions.treeSitterWasmUri;
+              },
+            }
+          : undefined;
+      await Parser.init(options);
       const absolute = Path.join(__dirname, "tree-sitter-elm.wasm");
       const pathToWasm = Path.relative(process.cwd(), absolute);
       connection.console.info(
@@ -69,16 +80,13 @@ export function startCommonServer(
         useValue: new CapabilityCalculator(params.capabilities),
       });
 
-      const initializationOptions: IClientSettings =
-        params.initializationOptions ?? {};
-
       container.register("Settings", {
         useValue: new Settings(initializationOptions, params.capabilities),
       });
 
       const { Server } = await import("./server");
 
-      server = new Server(params, fileSystemHost);
+      server = new Server(params, fileSystemHost, initializationOptions);
 
       initSuccessfull = server.initSuccessfull.valueOf();
 
diff --git a/src/server.ts b/src/server.ts
index d5fc982e..d7198b34 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -33,7 +33,7 @@ import { FindTestsProvider } from "./providers/findTestsProvider";
 import { ElmReviewDiagnostics } from "./providers/diagnostics/elmReviewDiagnostics";
 import { findElmJsonFiles } from "./node";
 import { VirtualFileProvider } from "./providers/virtualFileProvider";
-import { IFileSystemHost } from "./types";
+import { IFileSystemHost, InitializationOptions } from "./types";
 
 export interface ILanguageServer {
   readonly capabilities: InitializeResult;
@@ -50,11 +50,9 @@ export class Server implements ILanguageServer {
   constructor(
     private params: InitializeParams,
     private fileSystemHost: IFileSystemHost,
+    initializationOptions: InitializationOptions,
   ) {
     this.connection = container.resolve("Connection");
-    const initializationOptions = params.initializationOptions as {
-      elmJsonFiles?: string[];
-    };
 
     const uri = this.getWorkspaceUri(this.params);
 
diff --git a/src/types.ts b/src/types.ts
index baa1165c..79316313 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,7 +1,15 @@
 import { URI } from "vscode-uri";
+import { IClientSettings } from "./util/settings";
 
 export interface IFileSystemHost {
   readFile(uri: URI): Promise<string>;
   readDirectory(uri: URI, include?: string, depth?: number): Promise<URI[]>;
   watchFile(uri: URI, callback: () => void): void;
 }
+
+export type InitializationOptions = IClientSettings & {
+  treeSitterWasmUri?: string;
+
+  // Needed to support virtual workspaces
+  elmJsonFiles?: string[];
+};