diff --git a/requirements-dev.txt b/requirements-dev.txt
index 2162af7..d0f31f6 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.7
-Babel==2.3.4
+Babel==2.9.1
 codecov==2.0.3
 coverage==4.0.3
 docutils==0.12