diff --git a/package.json b/package.json
index d0b4f33..76ac82a 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   "devDependencies": {
     "mocha": "*",
     "chai": "*",
-    "folio": "0.2.x"
+    "folio": "~0.3.4"
   },
   "optionalDependencies": {},
   "engines": {