diff --git a/package.json b/package.json
index 3a98015..2182fc2 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "ts-jest": "23.10.5",
     "tslint": "5.12.1",
     "tslint-config-prettier": "1.18.0",
-    "typescript": "3.3.3"
+    "typescript": "3.9.6"
   },
   "homepage": "https://github.com/jfairley/github-slack-bot#readme",
   "keywords": [