diff --git a/.aegir.js b/.aegir.js
index 4d2f8bd..3808cf5 100644
--- a/.aegir.js
+++ b/.aegir.js
@@ -10,16 +10,16 @@ const mockUpgrader = {
 }
 let listener
 
-function boot (done) {
+async function boot () {
   const ws = new WS({ upgrader: mockUpgrader })
   const ma = multiaddr('/ip4/127.0.0.1/tcp/9095/ws')
   listener = ws.createListener(conn => pipe(conn, conn))
-  listener.listen(ma).then(() => done()).catch(done)
+  await listener.listen(ma)
   listener.on('error', console.error)
 }
 
-function shutdown (done) {
-  listener.close().then(done).catch(done)
+function shutdown () {
+  return listener.close()
 }
 
 module.exports = {
diff --git a/package.json b/package.json
index 3c491c1..983d8cf 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
   },
   "devDependencies": {
     "abort-controller": "^3.0.0",
-    "aegir": "^20.3.1",
+    "aegir": "^21.4.4",
     "bl": "^4.0.0",
     "chai": "^4.2.0",
     "dirty-chai": "^2.0.1",