diff --git a/Additional-Learning-Resources.md b/Additional-Learning-Resources.md
index 7d0d187..eef6162 100644
--- a/Additional-Learning-Resources.md
+++ b/Additional-Learning-Resources.md
@@ -5,7 +5,7 @@ You can find documentation about the core of PDF.js [here](https://github.com/Me
 ## Publications
 
 You can read more about PDF.js here:
-+ http://andreasgal.com/2011/06/15/pdf-js/
++ https://andreasgal.com/2011/06/15/pdf-js/
 + https://web.archive.org/web/20160408133647/https://blog.mozilla.org/cjones/2011/06/15/overview-of-pdf-js-guts/
 
 ## Presentations