diff --git a/package.json b/package.json
index b79d37d..1a14fc0 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "pull-ws": "hugomrdias/pull-ws#fix/bundle-size"
   },
   "devDependencies": {
-    "aegir": "^18.2.1",
+    "aegir": "^20.0.0",
     "chai": "^4.2.0",
     "dirty-chai": "^2.0.1",
     "interface-transport": "~0.3.7",
diff --git a/src/listener.js b/src/listener.js
index 2149cb3..7c5538b 100644
--- a/src/listener.js
+++ b/src/listener.js
@@ -40,7 +40,7 @@ module.exports = (options, handler) => {
       return callback(new Error('Listener is not ready yet'))
     }
 
-    let ipfsId = listeningMultiaddr.getPeerId()
+    const ipfsId = listeningMultiaddr.getPeerId()
 
     // Because TCP will only return the IPv6 version
     // we need to capture from the passed multiaddr
diff --git a/test/compliance.node.js b/test/compliance.node.js
index 3f31f97..a4977d9 100644
--- a/test/compliance.node.js
+++ b/test/compliance.node.js
@@ -8,7 +8,7 @@ const WS = require('../src')
 describe('compliance', () => {
   tests({
     setup (callback) {
-      let ws = new WS()
+      const ws = new WS()
       const addrs = [
         multiaddr('/ip4/127.0.0.1/tcp/9091/ws'),
         multiaddr('/ip4/127.0.0.1/tcp/9092/wss'),