diff --git a/package.json b/package.json
index d1b4adf..5cf9f86 100644
--- a/package.json
+++ b/package.json
@@ -47,18 +47,18 @@
 		"symbol-observable": "^1.2.0"
 	},
 	"devDependencies": {
-		"@types/jsdom": "^11.0.4",
-		"@types/node": "^10.1.2",
+		"@types/jsdom": "^11.12.0",
+		"@types/node": "^10.11.2",
 		"@types/tempy": "^0.1.0",
 		"@types/zen-observable": "^0.8.0",
 		"ava": "*",
 		"del-cli": "^1.1.0",
 		"jsdom": "^11.6.2",
-		"rxjs": "^6.0.0",
+		"rxjs": "^6.3.3",
 		"tempy": "^0.2.1",
 		"tslint": "^5.9.1",
 		"tslint-xo": "^0.9.0",
-		"typescript": "^3.0.1",
+		"typescript": "^3.1.1",
 		"zen-observable": "^0.8.8"
 	},
 	"types": "dist/index.d.ts"
diff --git a/source/index.ts b/source/index.ts
index d53a3da..8f93bba 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -1,3 +1,7 @@
+/// <reference lib="es2016"/>
+/// <reference lib="es2017.sharedmemory"/>
+/// <reference lib="esnext.asynciterable"/>
+/// <reference lib="dom"/>
 import util from 'util';
 import symbolObservable from 'symbol-observable';
 
diff --git a/tsconfig.json b/tsconfig.json
index f7d6fd1..e1bc1fa 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,11 +3,10 @@
 		"outDir": "dist",
 		"target": "es2016",
 		"lib": [
-			"dom",
-			"es2015",
 			"es2016",
 			"es2017.sharedmemory",
-			"esnext.asynciterable"
+			"esnext.asynciterable",
+			"dom"
 		],
 		"module": "commonjs",
 		"moduleResolution": "node",