diff --git a/setup.py b/setup.py
old mode 100755
new mode 100644
index b57e655..4f74236
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
     tests_require=["nose", "flake8"],
     install_requires=[
         "arrow>=0.4.2",
-        "ciso8601>=1.0.2,<2",
+        "ciso8601>=1.0.2,<3",
         "pytz>=2015.4",
         "elasticsearch>=7.0,<7.14",
     ],