diff --git a/requirements_test.txt b/requirements_test.txt
index ef2bdd4..f472c64 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -6,7 +6,7 @@
 #
 alabaster==0.7.10
     # via sphinx
-babel==2.4.0
+babel==2.9.1
     # via sphinx
 certifi==2017.7.27.1
     # via requests