diff --git a/bazel/rules_sphinx/requirements.txt b/bazel/rules_sphinx/requirements.txt
index 3cc9fe9..5f8c204 100644
--- a/bazel/rules_sphinx/requirements.txt
+++ b/bazel/rules_sphinx/requirements.txt
@@ -29,7 +29,7 @@ docutils==0.15
 # 4. If any packages are added/removed, update the ./BUILD file accordingly.
 
 alabaster==0.7.12
-Babel==2.8.0
+Babel==2.9.1
 certifi==2019.11.28
 chardet==3.0.4
 idna==2.8