diff --git a/requirements.txt b/requirements.txt
index 198356b..3a569dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@
 
 -e git+git://github.com/shoopio/sphinx-shoop-theme.git@v0.6.0#egg=sphinx-shoop-theme==0.6.0
 alabaster==0.7.7          # via sphinx
-babel==2.3.3              # via sphinx
+babel==2.9.1              # via sphinx
 commonmark==0.5.4         # via recommonmark
 docutils==0.12            # via recommonmark, sphinx
 imagesize==0.7.0          # via sphinx