diff --git a/package.json b/package.json
index 092ea02..f376cba 100644
--- a/package.json
+++ b/package.json
@@ -136,7 +136,7 @@
     "docs": "aegir docs"
   },
   "devDependencies": {
-    "aegir": "^38.1.8",
+    "aegir": "^40.0.0",
     "p-defer": "^4.0.0",
     "wherearewe": "^2.0.1"
   },