diff --git a/package.json b/package.json
index 42c33e2..c3bed3f 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
 	"license": "MIT",
 	"main": "papaparse.js",
 	"devDependencies": {
-		"chai": "^3.0.0",
+		"chai": "^4.1.2",
 		"connect": "^3.3.3",
 		"eslint": "^4.19.1",
 		"grunt": "^0.4.5",