diff --git a/package.json b/package.json
index d0c8caa39..efc22804d 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
     "@types/arrify": "^1.0.4",
     "@types/async": "^2.0.50",
     "@types/extend": "^3.0.0",
-    "@types/is": "0.0.20",
+    "@types/is": "0.0.21",
     "@types/mocha": "^5.2.5",
     "@types/proxyquire": "^1.3.28",
     "@types/sinon": "^5.0.5",