diff --git a/package.json b/package.json
index 7afa31f..b98f4db 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,9 @@
 		"lodash.isequal": "^4.5.0",
 		"nyc": "^11.2.1",
 		"tslint": "^5.8.0",
+		"tslint-xo": "^0.3.0",
 		"typedoc": "^0.9.0",
+		"typescript": "^2.6.2",
 		"vali-date": "^1.0.0",
 		"webpack": "^3.8.1"
 	},