diff --git a/requirements.txt b/requirements.txt
index 05f65c8..7c6e888 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 requests==2.25.1
-iso8601==0.1.13
+iso8601==1.0.2
 dataclasses==0.6
diff --git a/setup.py b/setup.py
index 2d8bf7d..2b9c813 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@
     install_requires=[
         'dataclasses>=0.6;python_version<"3.7"',
         'requests>=2.22.0,<3.0.0',
-        'iso8601>=0.1.12,<0.2.0',
+        'iso8601>=0.1.12,<1.1.0',
     ],
     classifiers=[
         'Programming Language :: Python :: 3',