diff --git a/package.json b/package.json
index d9c116a..834b310 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "url-parse": "1.1.x"
   },
   "devDependencies": {
-    "assume": "~1.5.0",
+    "assume": "~1.5.1",
     "istanbul": "0.4.x",
     "mocha": "~3.2.0",
     "pre-commit": "~1.2.0"