diff --git a/requirements.txt b/requirements.txt
index 235e4f7..8cc40fd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.10
 asn1crypto==0.22.0
-Babel==2.4.0
+Babel==2.9.1
 certifi==2017.7.27.1
 cffi==1.10.0
 chardet==3.0.4