diff --git a/requirements.txt b/requirements.txt
index f13102a..dbf5e87 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.12
-babel==2.6.0
+babel==2.9.1
 certifi==2019.3.9
 chardet==3.0.4
 docutils==0.14