diff --git a/.build.yml b/.build.yml
index e0b146e..0f6d270 100644
--- a/.build.yml
+++ b/.build.yml
@@ -13,7 +13,7 @@ packages:
 - texlive-fonts-extra
 - texlive-pictures
 - texlive-science
-- tidy
+- latexmk
 sources :
 - https://git.sr.ht/~gpcf/advtrains
 artifacts: