diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3d71ab3..a589173 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-Babel==2.3.4
+Babel==2.9.1
 coveralls==1.1
 docutils==0.12
 flake8>=3.3.0,<3.4.0