diff --git a/requirements_dev.txt b/requirements_dev.txt
index ae88e48..f71c038 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ alabaster==0.7.10
 argh==0.26.2
 astroid==1.6.2
 attrs==17.4.0
-babel==2.5.3
+babel==2.9.1
 bumpversion==0.5.3
 certifi==2018.1.18
 chardet==3.0.4