diff --git a/package.json b/package.json
index ae246d89..2309d93c 100644
--- a/package.json
+++ b/package.json
@@ -176,7 +176,7 @@
   },
   "devDependencies": {
     "@types/sinon": "^17.0.2",
-    "aegir": "^43.0.1",
+    "aegir": "^44.1.1",
     "sinon": "^18.0.0",
     "sinon-ts": "^2.0.0"
   },
diff --git a/src/multiaddr.ts b/src/multiaddr.ts
index 95348b16..531d6100 100644
--- a/src/multiaddr.ts
+++ b/src/multiaddr.ts
@@ -37,10 +37,10 @@ const DNS_CODES = [
  */
 export class Multiaddr implements MultiaddrInterface {
   public bytes: Uint8Array
-  #string: string
-  #tuples: Tuple[]
-  #stringTuples: StringTuple[]
-  #path: string | null
+  readonly #string: string
+  readonly #tuples: Tuple[]
+  readonly #stringTuples: StringTuple[]
+  readonly #path: string | null
 
   [symbol]: boolean = true