diff --git a/README.md b/README.md
index 445e2f6..4248ca1 100644
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@@ -73,11 +73,11 @@ MINIX is a great tool for learning about Linux. MINIX is like a small and simpli
 - Data structures and algorithms
 
 ## Making your own hard disk image
-To make a bootable and editable hard disk image, you'll need to install it from the official MINIX CD. You can find it at [minix3.org](http://minix3.org). MINIX 3 comes with a `setup.sh` utility, which will install to the hard disk that you specify with your desired network card, partitions, etc.
+To make a bootable and editable hard disk image, you'll need to install it from the official MINIX CD. You can find it at [minix3.org](https://minix3.org). MINIX 3 comes with a `setup.sh` utility, which will install to the hard disk that you specify with your desired network card, partitions, etc.
 
 ## References
 - [Operating Systems: Design and Implementation (3e)](https://www.amazon.com/Operating-Systems-Design-Implementation-3rd/dp/0131429388)
-- [Albert Woodhull's site](http://minix1.woodhull.com)
-- [The official MINIX site](http://minix3.org). Installation images can be downloaded from here.
+- [Albert Woodhull's site](https://minix1.woodhull.com)
+- [The official MINIX site](https://minix3.org). Installation images can be downloaded from here.
 - [Minix QD](https://github.com/davidgiven/minix2) (has Minix 1 and 2).
-- The [MINIX mailing list](http://groups.google.com/g/minix3)
+- The [MINIX mailing list](https://groups.google.com/g/minix3)