diff --git a/requirements.txt b/requirements.txt
index decbd52..560c1e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-aniso8601==7.0.0
+aniso8601==9.0.1
 appdirs==1.4.4
 astroid==2.4.2
 attrs==20.3.0