Tom-Newton commented on code in PR #40120:
URL: https://github.com/apache/arrow/pull/40120#discussion_r1493925298


##########
ci/conda_env_python.txt:
##########
@@ -17,7 +17,7 @@
 
 # don't add pandas here, because it is not a mandatory test dependency
 boto3  # not a direct dependency of s3fs, but needed for our s3fs fixture
-cffi
+cffi<1.16.0  # cffi 1.16.0 with Python 3.9 has an incompatibility with grpcio 
(required for GCS testbench)

Review Comment:
   I don't know if it's possible with conda. The only docs I could find about 
the version specification syntax was this 
https://docs.conda.io/projects/conda/en/4.6.0/_downloads/52a95608c49671267e40c689e0bc00ca/conda-cheatsheet.pdf



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