diff --git a/blockchain-explorer/docs/requirements.txt b/blockchain-explorer/docs/requirements.txt
index 0053539..b6a3dbe 100644
--- a/blockchain-explorer/docs/requirements.txt
+++ b/blockchain-explorer/docs/requirements.txt
@@ -3,7 +3,7 @@
 python-markdown-math==0.2
 
 alabaster==0.7.8
-Babel==2.3.4
+Babel==2.9.1
 docutils==0.12
 imagesize==0.7.1
 Jinja2==2.10.1