diff --git a/README.md b/README.md
index 6ab021b..ec0ce50 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,12 @@
 <p align="center">
-    <a href="http://getbootstrap.com/" target="_blank" rel="external">
+    <a href="https://getbootstrap.com/" target="_blank" rel="external">
         <img src="https://getbootstrap.com/docs/5.0/assets/brand/bootstrap-logo.svg" height="80px">
     </a>
     <h1 align="center">Twitter Bootstrap 5 Extension for Yii 2</h1>
     <br>
 </p>
 
-This is the Twitter Bootstrap extension for [Yii framework 2.0](http://www.yiiframework.com). It encapsulates [Bootstrap 5](http://getbootstrap.com/) components
+This is the Twitter Bootstrap extension for [Yii framework 2.0](https://www.yiiframework.com). It encapsulates [Bootstrap 5](http://getbootstrap.com/) components
 and plugins in terms of Yii widgets, and thus makes using Bootstrap components/plugins
 in Yii applications extremely easy.
 
@@ -22,7 +22,7 @@ Documentation is at [docs/guide/README.md](docs/guide/README.md).
 Installation
 ------------
 
-The preferred way to install this extension is through [composer](http://getcomposer.org/download/).
+The preferred way to install this extension is through [composer](https://getcomposer.org/download/).
 
 Either run