diff --git a/requirements_dev.txt b/requirements_dev.txt
index aacba04..cd9caa9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.6
 argh==0.26.1
-Babel==2.1.1
+Babel==2.9.1
 backports-abc==0.4
 beautifulsoup4==4.4.1
 coverage==3.7.1