diff --git a/package.json b/package.json
index d05c834..c94e9bb 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "@types/react": "16.8.16",
     "@types/react-dom": "16.8.4",
     "@types/react-router-dom": "4.3.2",
+    "@types/validator": "10.11.1",
     "@verdaccio/babel-preset": "0.2.1",
     "@verdaccio/eslint-config": "0.0.1",
     "@verdaccio/types": "6.1.0",
diff --git a/src/utils/url.ts b/src/utils/url.ts
index 4832633..119888e 100644
--- a/src/utils/url.ts
+++ b/src/utils/url.ts
@@ -2,7 +2,7 @@ import isURLValidator from 'validator/lib/isURL';
 import isEmailValidator from 'validator/lib/isEmail';
 import '../../types';
 
-export function isURL(url): boolean {
+export function isURL(url: string): boolean {
   return isURLValidator(url || '', {
     protocols: ['http', 'https', 'git+https'],
     require_protocol: true,
diff --git a/yarn.lock b/yarn.lock
index f1b4a56..ffdd3c1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1743,6 +1743,11 @@
   resolved "https://registry.verdaccio.org/@types%2funist/-/unist-2.0.3.tgz#9c088679876f374eb5983f150d4787aa6fb32d7e"
   integrity sha512-FvUupuM3rlRsRtCN+fDudtmytGO6iHJuuRKS1Ss0pG5z8oX0diNEw94UEL7hgDbpN94rgaK5R7sWm6RrSkZuAQ==
 
+"@types/validator@10.11.1":
+  version "10.11.1"
+  resolved "https://registry.npmjs.org/@types/validator/-/validator-10.11.1.tgz#76e983ce155261838463b73728856cf8bc628d53"
+  integrity sha512-bVhLqvb+5xUNWRFnuuecRVISTvsG6AdhrB2kb/tChgtuTTqARqlQ3rLhOPy8cINZEUB8PkR+goyWF6fWxg4iSw==
+
 "@types/vfile-message@*":
   version "1.0.1"
   resolved "https://registry.verdaccio.org/@types%2fvfile-message/-/vfile-message-1.0.1.tgz#e1e9895cc6b36c462d4244e64e6d0b6eaf65355a"