diff --git a/package.json b/package.json
index d841f2b..b66441c 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "coveralls": "2.11.16",
     "eslint": "3.15.0",
     "eslint-plugin-flowtype": "2.30.0",
-    "flow-bin": "0.39.0",
+    "flow-bin": "0.49.1",
     "flow-remove-types": "1.2.0",
     "istanbul": "0.4.5",
     "mocha": "3.2.0",