diff --git a/pyproject.toml b/pyproject.toml
index 098a38958b5cc..5b3c3fd598b2f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,10 +7,11 @@ requires = [
     "Cython>=0.29.21,<3",  # Note: sync with setup.py
     "numpy==1.15.4; python_version=='3.6' and platform_system!='AIX'",
     "numpy==1.15.4; python_version=='3.7' and platform_system!='AIX'",
-    "numpy==1.17.3; python_version>='3.8' and platform_system!='AIX'",
+    "numpy==1.17.3; python_version=='3.8' and platform_system!='AIX'",
     "numpy==1.16.0; python_version=='3.6' and platform_system=='AIX'",
     "numpy==1.16.0; python_version=='3.7' and platform_system=='AIX'",
-    "numpy==1.17.3; python_version>='3.8' and platform_system=='AIX'",
+    "numpy==1.17.3; python_version=='3.8' and platform_system=='AIX'",
+    "numpy; python_version>='3.9'",
 ]
 
 [tool.black]