diff --git a/package.json b/package.json
index e03f1800..20ec1a17 100644
--- a/package.json
+++ b/package.json
@@ -122,7 +122,7 @@
   "devDependencies": {
     "@babel/core": "^7.9.0",
     "@babel/preset-env": "^7.9.0",
-    "ascjs": "^3.1.2",
+    "ascjs": "^4.0.0",
     "basichtml": "^2.2.0",
     "coveralls": "^3.0.11",
     "drop-babel-typeof": "^1.0.3",