diff --git a/package.json b/package.json
index ba01e54b..23fe3e8c 100644
--- a/package.json
+++ b/package.json
@@ -116,7 +116,7 @@
     "swagger-client": "2.1.18",
     "tedious": "9.2.1",
     "textract": "2.5.0",
-    "typescript": "4.1.2",
+    "typescript": "3.9.4",
     "url-join": "4.0.1",
     "vbscript-to-typescript": "1.0.8",
     "walk-promise": "0.2.0",