diff --git a/setup.py b/setup.py
index 878b2ac1..11c68240 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@ def read(fname):
 
 install_requires += [
     # need to install  to avoid conflict between aiohttp (dependency of s3fs) and requests (cdsapi)
-    "chardet<4>=3.0",
+    "chardet>=3.0,<4.0",
     "numpy",
     "xarray>=0.17.0",
     "netcdf4",