diff --git a/setup.py b/setup.py
index d592e4e..6b85989 100755
--- a/setup.py
+++ b/setup.py
@@ -10,6 +10,6 @@ setup(
 	description = "Decadic toolkit.",
 	install_requires = [
 		"jsmin >= 2.2.2",
-		"json >= 2.0.9"
+		"pytz >= 2022.1"
 	]
 )