diff --git a/tests/requirements-libraries.txt b/tests/requirements-libraries.txt
index e43a2c7..6898068 100644
--- a/tests/requirements-libraries.txt
+++ b/tests/requirements-libraries.txt
@@ -20,7 +20,7 @@
 # Working
 # -------
 # These packages work with no (known) issues.
-babel==2.6.0
+babel==2.9.1
 boto==2.49.0
 boto3==1.9.35
 botocore==1.12.35