diff --git a/License.md b/License.md
index 6e0748d..ab46b05 100644
--- a/License.md
+++ b/License.md
@@ -1,7 +1,7 @@
 To the extent possible under law,
-[Karl Broman](http://github.com/kbroman)
+[Karl Broman](https://github.com/kbroman)
 has waived all copyright and related or neighboring rights to
-“[Tools for Reproducible Research](http://github.com/kbroman/Tools4RR)”.
+“[Tools for Reproducible Research](https://github.com/kbroman/Tools4RR)”.
 This work is published from the United States.
 <br/>
-[![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)](http://creativecommons.org/publicdomain/zero/1.0/)
+[![CC0](https://i.creativecommons.org/p/zero/1.0/88x31.png)](https://creativecommons.org/publicdomain/zero/1.0/)
diff --git a/ReadMe.md b/ReadMe.md
index 518e0d7..817805f 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -3,16 +3,16 @@
 Materials for a one-credit course on tools for reproducible
 research at UW&ndash;Madison in Spring, 2014-Spring 2016.
 
-- The [website](http://kbroman.org/Tools4RR)
+- The [website](https://kbroman.org/Tools4RR)
 - The [source for the website](https://github.com/kbroman/Tools4RR/tree/gh-pages)
 - The [source for other material (e.g., lecture slides)](https://github.com/kbroman/Tools4RR/tree/master)
 
 ---
 
 To the extent possible under law,
-[Karl Broman](http://github.com/kbroman)
+[Karl Broman](https://github.com/kbroman)
 has waived all copyright and related or neighboring rights to
-&ldquo;[Tools for Reproducible Research](http://github.com/kbroman/Tools4RR)&rdquo;.
+&ldquo;[Tools for Reproducible Research](https://github.com/kbroman/Tools4RR)&rdquo;.
 This work is published from the United States.
 <br/>
-[![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)](http://creativecommons.org/publicdomain/zero/1.0/)
+[![CC0](https://i.creativecommons.org/p/zero/1.0/88x31.png)](https://creativecommons.org/publicdomain/zero/1.0/)