diff --git a/setup.py b/setup.py
index e9753ca0..760a9416 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,8 @@ def read(fname):
 install_requires += (["dask"],)
 install_requires += (["zarr>=2.8.1"],)
 install_requires += (["fsspec[s3]!=2021.07.0"],)
-install_requires += (["aiohttp"],)
+# See https://github.com/fsspec/filesystem_spec/issues/819
+install_requires += (["aiohttp<4"],)
 install_requires += (["requests"],)
 install_requires += (["scikit-image"],)
 install_requires += (["toolz"],)