diff --git a/requirements_dev.txt b/requirements_dev.txt
index eb17b0a..50a27c9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -9,7 +9,7 @@ astroid==1.6.3
 async-timeout==2.0.1
 attrs==17.4.0
 autopep8==1.3.5
-babel==2.5.3
+babel==2.9.1
 certifi==2018.4.16
 cffi==1.11.5; platform_python_implementation != 'PyPy'
 chardet==3.0.4