diff --git a/package.json b/package.json
index b6049b9..5258454 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "chai": "^3.5.0",
     "eslint": "^3.13.1",
     "eslint-plugin-flowtype": "^2.29.2",
-    "flow-bin": "^0.39.0",
+    "flow-bin": "^0.42.0",
     "mocha": "^3.2.0",
     "nyc": "^10.0.0"
   },