diff --git a/src/content/blog/004-12in23/index.mdx b/src/content/blog/004-12in23/index.mdx
index 17d3770..1ca0abc 100644
--- a/src/content/blog/004-12in23/index.mdx
+++ b/src/content/blog/004-12in23/index.mdx
@@ -100,7 +100,7 @@ I realize that setting them up on NixOS is too cumbersome…
 
 I will keep some notes about my progress here.
 
-[exercism]: https//www.exercism.org/
+[exercism]: https://www.exercism.org/
 [info]: https://exercism.org/challenges/12in23
 [12in23-vlog]: https://youtu.be/Svzev-9shKs
 [tracks]: https://exercism.org/tracks