diff --git a/package.json b/package.json
index 94b22a9..0ae7c8b 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
 		"tempy": "^0.2.1",
 		"tslint": "^5.8.0",
 		"tslint-xo": "^0.3.0",
-		"typescript": "^2.6.1"
+		"typescript": "^2.7.0"
 	},
 	"types": "dist/index.d.ts"
 }
diff --git a/tsconfig.json b/tsconfig.json
index 05773b4..5621df9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -16,7 +16,9 @@
 		"noFallthroughCasesInSwitch": true,
 		"strictNullChecks": true,
 		"strictFunctionTypes": true,
-		"alwaysStrict": true
+		"strictPropertyInitialization": true,
+		"alwaysStrict": true,
+		"esModuleInterop": true
 	},
 	"exclude": [
 		"node_modules",