kszucs commented on a change in pull request #11606:
URL: https://github.com/apache/arrow/pull/11606#discussion_r742885464



##########
File path: python/pyproject.toml
##########
@@ -18,10 +18,8 @@
 [build-system]
 requires = [
     "cython >= 0.29",
-    "numpy==1.16.6; python_version<'3.9'",
-    "numpy==1.19.4; python_version=='3.9'",
-    "numpy==1.21.3; python_version>'3.9'",
-    "setuptools",
+    "oldest-supported-numpy",

Review comment:
       Based on the blame it points to 
https://github.com/numpy/numpy/issues/17913.
   
   I guess the latest crossbow builds should fail if the pin is still required.
   
   cc @xhochy 
   




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