diff --git a/index.d.ts b/index.d.ts
index 9332abf..c4675e1 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -41,10 +41,10 @@ declare const pDefer: {
 	})();
 	```
 	*/
-	<ValueType = unknown>(): pDefer.DeferredPromise<ValueType>;
+	<ValueType>(): pDefer.DeferredPromise<ValueType>;
 
 	// TODO: Remove this for the next major release, refactor the whole definition to:
-	// declare function pDefer<ValueType = unknown>(): pDefer.DeferredPromise<
+	// declare function pDefer<ValueType>(): pDefer.DeferredPromise<
 	// 	ValueType
 	// >;
 	// export = pDefer;
diff --git a/package.json b/package.json
index 7785c4a..b80b2bc 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
 		"bluebird"
 	],
 	"devDependencies": {
-		"ava": "^1.4.1",
+		"ava": "^2.0.0",
 		"tsd": "^0.7.2",
 		"xo": "^0.24.0"
 	}