diff --git a/api-docs/requirements.txt b/api-docs/requirements.txt
index f700e94..94fdcc9 100644
--- a/api-docs/requirements.txt
+++ b/api-docs/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.7
-Babel==2.3.4
+Babel==2.9.1
 certifi==2016.2.28
 docutils==0.12
 imagesize==0.7.1