diff --git a/setup.py b/setup.py
index ca7bc3a0cd..43c69fcfd2 100755
--- a/setup.py
+++ b/setup.py
@@ -123,7 +123,7 @@ def run_tests(self):
     extras_require={
         "security": [],
         "socks": ["PySocks>=1.5.6, !=1.5.7"],
-        "use_chardet_on_py3": ["chardet>=3.0.2,<5"],
+        "use_chardet_on_py3": ["chardet>=3.0.2,<6"],
     },
     project_urls={
         "Documentation": "https://requests.readthedocs.io",