--- a/guide.md
+++ b/guide.md
@@ -2,5 +2,5 @@
 
 This example deliberately mistypes a documentation URL. It is not a historical migration.
 
-Use [Python pathlib](https://docs.python.org/3/library/pathlib/index.html) for filesystem paths, files and directories.
-Keep the [Python pathlib reference](https://docs.python.org/3/library/pathlib/index.html) nearby while writing scripts.
+Use [Python pathlib](https://compenv.phys.ethz.ch/python/ecosystem_3/13_pathlib/) for filesystem paths, files and directories.
+Keep the [Python pathlib reference](https://compenv.phys.ethz.ch/python/ecosystem_3/13_pathlib/) nearby while writing scripts.