diff --git a/packages/obsidian-testing-framework/package.json b/packages/obsidian-testing-framework/package.json
index 065f509..fc9db59 100644
--- a/packages/obsidian-testing-framework/package.json
+++ b/packages/obsidian-testing-framework/package.json
@@ -8,6 +8,7 @@
     "@codemirror/view": "^6.0.1",
     "@playwright/test": "^1.58.2",
     "asar": "^3.2.0",
+    "async-mutex": "^0.5.0",
     "electron": "^33.0.2",
     "obsidian": "latest",
     "playwright": "^1.58.2",
diff --git a/packages/obsidian-testing-framework/src/electron-singleton.ts b/packages/obsidian-testing-framework/src/electron-singleton.ts
index 5d22a71..172f012 100644
--- a/packages/obsidian-testing-framework/src/electron-singleton.ts
+++ b/packages/obsidian-testing-framework/src/electron-singleton.ts
@@ -1,22 +1,26 @@
 import type { ElectronApplication } from "playwright"
 import {_electron as electron} from "playwright";
 import { addConsoleListener } from "./internal-util.js";
+import { Mutex } from "async-mutex";
 
 const singleton: {
 	app: ElectronApplication | null
 } = {
 	app: null,
 }
+const mutex = new Mutex();
 
 export async function getOrCreateApp(obsidianPath: string, uriArg?: string) {
 	if (singleton.app) {
 		return singleton.app;
 	}
+	const release =await mutex.acquire();
 	const app = await electron.launch({
 		timeout: 60000,
 		args: [obsidianPath, uriArg].filter((a) => !!a) as string[],
 	});
 	addConsoleListener(app);
 	singleton.app = app;
+	await release();
 	return app;
 }
diff --git a/yarn.lock b/yarn.lock
index 6edc430..7a660cf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1139,6 +1139,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"async-mutex@npm:^0.5.0":
+  version: 0.5.0
+  resolution: "async-mutex@npm:0.5.0"
+  dependencies:
+    tslib: "npm:^2.4.0"
+  checksum: 10c0/9096e6ad6b674c894d8ddd5aa4c512b09bb05931b8746ebd634952b05685608b2b0820ed5c406e6569919ff5fe237ab3c491e6f2887d6da6b6ba906db3ee9c32
+  languageName: node
+  linkType: hard
+
 "balanced-match@npm:^1.0.0":
   version: 1.0.2
   resolution: "balanced-match@npm:1.0.2"
@@ -2626,6 +2635,7 @@ __metadata:
     "@playwright/test": "npm:^1.58.2"
     "@types/tmp": "npm:^0"
     asar: "npm:^3.2.0"
+    async-mutex: "npm:^0.5.0"
     electron: "npm:^33.0.2"
     obsidian: "npm:latest"
     playwright: "npm:^1.58.2"
@@ -3284,6 +3294,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tslib@npm:^2.4.0":
+  version: 2.8.1
+  resolution: "tslib@npm:2.8.1"
+  checksum: 10c0/9c4759110a19c53f992d9aae23aac5ced636e99887b51b9e61def52611732872ff7668757d4e4c61f19691e36f4da981cd9485e869b4a7408d689f6bf1f14e62
+  languageName: node
+  linkType: hard
+
 "tsutils@npm:^3.21.0":
   version: 3.21.0
   resolution: "tsutils@npm:3.21.0"