diff --git a/docs/requirements.txt b/docs/requirements.txt
index 61dc91e..a59ffef 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,7 +2,7 @@ alabaster==0.7.12
 appnope==0.1.0
 atomicwrites==1.3.0
 attrs==19.1.0
-babel==2.6.0
+babel==2.9.1
 backcall==0.1.0
 bleach==3.1.1
 certifi==2019.3.9