diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index ebe0489..63bb916 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -6,7 +6,7 @@ on:
       - '*'
 
 env:
-  CIBW_SKIP: cp27-* cp33-* cp34-* cp35-* *-win32 *-manylinux_i686 *-musllinux* pp27* pp36* pp37* pp38* pp39* pp310* 
+  CIBW_SKIP: pp* *-win32 *-manylinux_i686 *-musllinux* 
 jobs:
   build_wheels:
     name: Build wheels on ${{ matrix.os }}
@@ -14,15 +14,20 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-20.04,  macos-latest, windows-2019]
-
+        arch: [auto]
+        include:
+          - os: ubuntu-20.04
+            arch: aarch64
     steps:
       - uses: actions/checkout@v2
 
       - name: Build wheels
-        uses: joerick/cibuildwheel@v2.16.2
+        uses: joerick/cibuildwheel@v2.19.1
         # to supply options, put them in 'env', like:
         env:
-          CIBW_BEFORE_BUILD: pip install oldest-supported-numpy
+          CIBW_ARCHS_LINUX: ${{matrix.arch}}
+          CIBW_BEFORE_BUILD: pip install numpy
+          CIBW_ARCHS_MACOS: "x86_64 arm64"
 
       - uses: actions/upload-artifact@v2
         with:
diff --git a/setup.py b/setup.py
index 64191c0..42d3b24 100755
--- a/setup.py
+++ b/setup.py
@@ -30,8 +30,8 @@ def __repr__(self):
 include_dirs = [ str(NumpyImport()), 'zi_lib/', './' ]
 
 setuptools.setup(
-  setup_requires=['pbr', 'numpy', 'cython<3'],
-  python_requires=">=3.7", # >= 3.6 < 4.0
+  setup_requires=['pbr', 'numpy', 'cython'],
+  python_requires=">=3.8",
   pbr=True,
   define_macros=[ ("NDEBUG", 1) ],
   ext_modules=[
diff --git a/tox.ini b/tox.ini
index f723cfd..bf31383 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ deps =
 	pip
 	setuptools
 	wheel
-	oldest-supported-numpy
+	numpy
 	-rrequirements.txt
 	-rdev_requirements.txt