diff --git a/requirements.txt b/requirements.txt
index 5254bf7..58e714a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ dogpile.cache==1.2.2; python_version >= '3.6'
 humanize==4.8.0; python_version >= '3.7'
 idna==3.4; python_version >= '3'
 importlib-metadata==6.8.0; python_version < '3.8'
-iso8601==2.0.0; python_version < '4' and python_full_version >= '3.6.2'
+iso8601==2.1.0; python_version < '4' and python_full_version >= '3.6.2'
 jmespath==1.0.1; python_version >= '3.7'
 jsonpatch==1.33; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 jsonpointer==2.4; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'