diff --git a/requirements.txt b/requirements.txt
index 89e58c4..458a6be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@ fontmake>=2.4
 fontbakery>=0.8.11
 gftools @ git+https://github.com/googlefonts/gftools@builder2
 fontprimer @ git+https://github.com/simoncozens/fontprimer
+babelfont @ git+https://github.com/simoncozens/babelfont
 gftools[qa]>=0.9.23
 drawbot-skia>=0.4.8
 sh>=1.14.2