diff --git a/package.json b/package.json
index 9619a43..066e1d2 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "connected": "~0.0.2"
   },
   "devDependencies": {
-    "assume": "~2.1.0",
+    "assume": "~2.2.0",
     "istanbul": "~0.4.5",
     "mocha": "~6.0.0",
     "pre-commit": "~1.2.0",