diff --git a/ci/win_test_installer.cmd b/ci/win_test_installer.cmd
index bc12af69c1..22621d4a81 100644
--- a/ci/win_test_installer.cmd
+++ b/ci/win_test_installer.cmd
@@ -17,7 +17,6 @@ echo %NEURONHOME%
 if not exist association.hoc.out (start /wait /REALTIME %cd%\ci\association.hoc)
 
 :: install oldest supported numpy
-C:\Python38\python.exe -m pip install numpy==1.20.3 || goto :error
 C:\Python39\python.exe -m pip install numpy==1.20.3 || goto :error
 C:\Python310\python.exe -m pip install numpy==1.21.6 || goto :error
 C:\Python311\python.exe -m pip install numpy==1.23.5 || goto :error
diff --git a/packaging/python/build_requirements.txt b/packaging/python/build_requirements.txt
index 9025f37387..71fe06794e 100644
--- a/packaging/python/build_requirements.txt
+++ b/packaging/python/build_requirements.txt
@@ -1,5 +1,3 @@
 cython
-cython<3;python_version<='3.8'
 packaging
 numpy
-numpy<2;python_version<='3.8'
diff --git a/packaging/python/test_requirements.txt b/packaging/python/test_requirements.txt
index c09b383a05..06e85a5d63 100644
--- a/packaging/python/test_requirements.txt
+++ b/packaging/python/test_requirements.txt
@@ -3,7 +3,6 @@ pytest
 setuptools;python_version>='3.12' # From 3.12, no longer installed by default
 
 # Oldest supported numpy versions
-numpy==1.20.3;python_version=='3.8'
 numpy==1.20.3;python_version=='3.9' and platform_machine!='arm64'
 numpy==1.21.6;python_version=='3.9' and platform_machine=='arm64'
 numpy==1.21.6;python_version=='3.10'