diff --git a/composer.json b/composer.json
index 3fffa3b..8c8fb45 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     "hhvm": "^4.29",
     "hhvm/hhvm-autoload": "^2.0|^3.0",
     "hhvm/hsl": "^4.0",
-    "hhvm/type-assert": "^3.2",
+    "hhvm/type-assert": "^3.2|^4.0",
     "hhvm/hhast": "^4.21.4"
   },
   "require-dev": {