diff --git a/requirements.txt b/requirements.txt
index 06639cb..9a4d91f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 alabaster==0.7.10
 appnope==0.1.0
 argh==0.26.2
-Babel==2.4.0
+Babel==2.9.1
 backports.shutil-get-terminal-size==1.0.0
 certifi==2017.4.17
 chardet==3.0.3