diff --git a/setup.cfg b/setup.cfg
index 70e41c2cfe4..7180a2ce971 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -36,6 +36,7 @@ install_requires =
     # See: https://conda-forge.org/feedstock-outputs/
     numpy
     pandas
+    attrs
     dataclasses ; python_version < '3.7'
     protobuf >=3.5.0.post1 # Per https://github.com/grpc/grpc/blob/v1.45.3/requirements.txt
     msgpack