diff --git a/package.json b/package.json
index b1fac16..eda7924 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "@types/chai": "^4.2.7",
     "@types/dirty-chai": "^2.0.2",
     "@types/mocha": "^5.2.7",
-    "aegir": "^20.0.0",
+    "aegir": "^21.2.0",
     "bundlesize": "~0.18.0",
     "chai": "^4.2.0",
     "dirty-chai": "^2.0.1"