fix moved URLs in documentation

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/dev/documentation.md b/docs/dev/documentation.md
index 7476782c..f6d6c9ac 100644
--- a/docs/dev/documentation.md
+++ b/docs/dev/documentation.md
@@ -32,5 +32,5 @@ Changing documentation for the API itself is fairly straight forward. Use [doxyg
 [Vector 35]: https://vector35.com/
 [mkdocs]: http://www.mkdocs.org/
 [breathe]: https://github.com/michaeljones/breathe
-[sphinx]: http://www.sphinx-doc.org/en/stable/index.html
+[sphinx]:  https://www.sphinx-doc.org/en/master/
 [doxygen]: https://www.doxygen.nl