diff --git a/packages/pdf-viewer/package.json b/packages/pdf-viewer/package.json
index e98c1ba..d9b716d 100644
--- a/packages/pdf-viewer/package.json
+++ b/packages/pdf-viewer/package.json
@@ -41,6 +41,7 @@
   },
   "devDependencies": {
     "@toeverything/resources": "workspace:*",
+    "@types/emscripten": "^1.39.13",
     "@vitest/ui": "2.1.3",
     "happy-dom": "^15.7.4",
     "vitest": "^2.1.3"