diff --git a/tests/language-tools.ts b/tests/language-tools.ts
index d427820..9f5c406 100644
--- a/tests/language-tools.ts
+++ b/tests/language-tools.ts
@@ -10,6 +10,24 @@ export async function test(options: RunOptions) {
 		beforeBuild: `pnpm dedupe --registry=${REGISTRY_ADDRESS}`,
 		build: 'build',
 		test: 'test',
-		overrideVueVersion: '@^3.5',
+		overrideVueVersion: '@^3.5.2',
+		// As of Oct 3 2024, the language-tools repo is using TypeScript 5.5.4 & 5.7.0-dev.20240904,
+		// while referring to them as `@latest` and `@next` respectively.
+		// TODO: infer the TypeScript versions from the cloned lockfile.
+		patchFiles: {
+			'package.json': (content) => {
+				const pkg = JSON.parse(content)
+				pkg.devDependencies.typescript = '~5.5.4'
+				pkg.devDependencies['typescript-stable'] = 'npm:typescript@~5.5.4'
+				return JSON.stringify(pkg, null, 2)
+			},
+			'test-workspace/package.json': (content) => {
+				const pkg = JSON.parse(content)
+				pkg.devDependencies['typescript-stable'] = 'npm:typescript@~5.5.4'
+				pkg.devDependencies['typescript-next'] =
+					'npm:typescript@5.7.0-dev.20240904'
+				return JSON.stringify(pkg, null, 2)
+			},
+		},
 	})
 }