diff --git a/extension/package.json b/extension/package.json
index 18da20f1..addd28d8 100644
--- a/extension/package.json
+++ b/extension/package.json
@@ -84,6 +84,7 @@
     "selenium-webdriver": "^3.6.0",
     "sinon-chrome": "^3.0.1",
     "style-loader": "^3.2.1",
+    "typescript": "~4.3.5",
     "webpack": "^5.52.1",
     "webpack-cli": "^4.8.0"
   }
diff --git a/yarn.lock b/yarn.lock
index 3ca47a86..47b6b961 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -25632,6 +25632,7 @@ fsevents@^1.2.7:
     selenium-webdriver: ^3.6.0
     sinon-chrome: ^3.0.1
     style-loader: ^3.2.1
+    typescript: ~4.3.5
     webpack: ^5.52.1
     webpack-cli: ^4.8.0
   languageName: unknown