diff --git a/bin/transformers/docs/requirements.txt b/bin/transformers/docs/requirements.txt
index 664c582..9e3f62d 100644
--- a/bin/transformers/docs/requirements.txt
+++ b/bin/transformers/docs/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.12
-Babel==2.7.0
+Babel==2.9.1
 certifi==2019.6.16
 chardet==3.0.4
 commonmark==0.9.0