diff --git a/py-polars/requirements-dev.txt b/py-polars/requirements-dev.txt
index 960c4cdfb77f2..e7eb4138634ff 100644
--- a/py-polars/requirements-dev.txt
+++ b/py-polars/requirements-dev.txt
@@ -22,9 +22,11 @@ fsspec
 s3fs[boto3]
 
 # Tooling
+flask!=2.2.0,!=2.2.1  # Required for moto.server w/o installing all moto[server] dependencies
+flask-cors  # Required for moto.server w/o installing all moto[server] dependencies
 hypothesis==6.82.0
 maturin==1.1.0
-moto[server]==4.1.13  # Need moto.server to mock s3fs - see aio-libs/aiobotocore#755
+moto[s3]==4.1.13  # Need moto.server to mock s3fs - see aio-libs/aiobotocore#755
 patchelf; platform_system == 'Linux'  # Extra dependency for maturin, only for Linux
 pytest==7.4.0
 pytest-cov==4.1.0