diff --git a/packages/typescript-vfs/package.json b/packages/typescript-vfs/package.json
index c4421a55db27..9543908ad78b 100755
--- a/packages/typescript-vfs/package.json
+++ b/packages/typescript-vfs/package.json
@@ -41,6 +41,7 @@
     "typescript": false
   },
   "dependencies": {
+    "@types/lz-string": "^1.3.33",
     "debug": "^4.1.1"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 9c020062f6e0..af1b515e6576 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6126,6 +6126,7 @@ __metadata:
   resolution: "@typescript/vfs@workspace:packages/typescript-vfs"
   dependencies:
     "@types/jest": ^25.1.3
+    "@types/lz-string": ^1.3.33
     babel-jest: ^26.0.6
     cpy-cli: ^3.1.1
     debug: ^4.1.1