diff --git a/package.json b/package.json
index 190d1f8..5fabe3c 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "gzip-size": "^3.0.0",
     "jsdom": "^9.12.0",
     "nyc": "^10.1.2",
-    "prettysize": "0.1.0",
+    "prettysize": "2.0.0",
     "snazzy": "^6.0.0",
     "standard": "^10.0.0",
     "tap": "^10.3.0",