diff --git a/package.json b/package.json
index 800aa56..ea6364d 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "test": "echo \"No 'yarn run test' available\""
   },
   "devDependencies": {
-    "@polkadot/dev": "^0.20.2",
+    "@polkadot/dev": "^0.20.3",
     "@types/node": "^10.3.4"
   }
 }
diff --git a/types/peer-info/index.d.ts b/types/peer-info/index.d.ts
index f6a7733..d8ae5ca 100644
--- a/types/peer-info/index.d.ts
+++ b/types/peer-info/index.d.ts
@@ -17,8 +17,8 @@ declare namespace PeerInfo {
     type MultiAddrSet = {
         size: number;
 
-        add (addr: MultiAddr): void;
-        addSafe (add: MultiAddr): void;
+        add (addr: MultiAddr | string): void;
+        addSafe (add: MultiAddr | string): void;
         delete (addr: MultiAddr): void;
         forEach (cb: (addr: MultiAddr, index: number) => any): void;
         has (addr: MultiAddr): boolean;
diff --git a/yarn.lock b/yarn.lock
index 03fe131..31995d3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -683,9 +683,9 @@
     lodash "^4.17.5"
     to-fast-properties "^2.0.0"
 
-"@polkadot/dev@^0.20.2":
-  version "0.20.2"
-  resolved "https://registry.yarnpkg.com/@polkadot/dev/-/dev-0.20.2.tgz#4e3cc0754eac414794284eb04cad334ad0b39c8f"
+"@polkadot/dev@^0.20.3":
+  version "0.20.3"
+  resolved "https://registry.yarnpkg.com/@polkadot/dev/-/dev-0.20.3.tgz#4650600dd1f5952ee0054f267c7ebc76dd883593"
   dependencies:
     "@babel/cli" "^7.0.0-beta.51"
     "@babel/core" "^7.0.0-beta.51"