diff --git a/docs/requirements.txt b/docs/requirements.txt
index 30c53b4..3d01e9f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.11
-Babel==2.6.0
+Babel==2.9.1
 certifi==2018.8.24
 chardet==3.0.4
 docutils==0.14