diff --git a/docsrc/requirements.txt b/docsrc/requirements.txt
index dab372a..2b9ba29 100644
--- a/docsrc/requirements.txt
+++ b/docsrc/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.12
-Babel==2.7.0
+Babel==2.9.1
 breathe==4.14.0
 certifi==2019.11.28
 chardet==3.0.4