diff --git a/requirements.txt b/requirements.txt
index f8ba275..f32146f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.10
 appdirs==1.4.3
-Babel==2.4.0
+Babel==2.9.1
 decorator==4.0.11
 docutils==0.13.1
 flake8==3.4.1