diff --git a/requirements.txt b/requirements.txt
index fb78b89..74e51e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ alabaster==0.7.12
 atomicwrites==1.3.0
 attrs==19.1.0
 bibtexparser==1.1.0
-Babel==2.6.0
+Babel==2.9.1
 chardet==3.0.4
 coverage==4.5.3
 coveralls==1.7.0