diff --git a/_config.yml b/_config.yml
index bc8bbca..1a26e84 100644
--- a/_config.yml
+++ b/_config.yml
@@ -919,6 +919,10 @@ vendors:
   gitalk_js:
   gitalk_css:
 
+  # Firebase
+  firebase_app:
+  firebase_firestore:
+
   # Algolia Search
   algolia_search:
   instant_search:
diff --git a/_vendors.yml b/_vendors.yml
index 7998f04..ff1b5e5 100644
--- a/_vendors.yml
+++ b/_vendors.yml
@@ -102,6 +102,14 @@ gitalk_css:
   name: gitalk
   version: 1.6.2
   file: dist/gitalk.css
+firebase_app:
+  name: firebase
+  version: 7.17.2
+  file: firebase-app.js
+firebase_firestore:
+  name: firebase
+  version: 7.17.2
+  file: firebase-firestore.js
 algolia_search:
   name: algoliasearch
   version: 4.3.1
diff --git a/layout/_third-party/statistics/firestore.njk b/layout/_third-party/statistics/firestore.njk
index 64baa55..167b807 100644
--- a/layout/_third-party/statistics/firestore.njk
+++ b/layout/_third-party/statistics/firestore.njk
@@ -1,6 +1,6 @@
 {%- if theme.firestore.enable %}
-  <script src="//cdn.jsdelivr.net/npm/firebase@7/firebase-app.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/firebase@7/firebase-firestore.js"></script>
+  <script src="{{ theme.vendors.firebase_app }}"></script>
+  <script src="{{ theme.vendors.firebase_firestore }}"></script>
   <script>
     firebase.initializeApp({
       apiKey   : '{{ theme.firestore.apiKey }}',