diff --git a/requirements.txt b/requirements.txt
index 5472fb1..c373b16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ cornice-swagger==1.0.0
 dockerflow==2020.6.0
 hupper==1.10.2
 idna==2.10
-iso8601==0.1.12
+iso8601==0.1.13
 jsonpatch==1.26
 jsonpointer==2.0
 jsonschema==3.2.0