diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
index ee125fe..a013d2a 100644
--- a/.github/workflows/build_wheel.yml
+++ b/.github/workflows/build_wheel.yml
@@ -28,11 +28,11 @@ jobs:
         uses: docker/setup-qemu-action@v1
 
       - name: Build wheels
-        uses: joerick/cibuildwheel@v2.16.5
+        uses: joerick/cibuildwheel@v2.19.1
         # to supply options, put them in 'env', like:
         env:
           CIBW_ARCHS_LINUX: ${{matrix.arch}}
-          CIBW_BEFORE_BUILD: pip install oldest-supported-numpy setuptools wheel cython
+          CIBW_BEFORE_BUILD: pip install numpy setuptools wheel cython
           CIBW_ARCHS_MACOS: "x86_64 arm64"
 
       - uses: actions/upload-artifact@v2
diff --git a/dijkstra3d.pyx b/dijkstra3d.pyx
index 2d6279d..a9281d9 100644
--- a/dijkstra3d.pyx
+++ b/dijkstra3d.pyx
@@ -36,6 +36,9 @@ import cython
 from libcpp.vector cimport vector
 cimport numpy as cnp
 import numpy as np
+
+np.import_array()
+
 import warnings
 
 __VERSION__ = '1.14.0'
diff --git a/pyproject.toml b/pyproject.toml
index 4ea4769..593be4b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,8 @@
 requires = [
     "setuptools>=42",
     "wheel",
-    "oldest-supported-numpy",
+    "numpy",
+    "cython",
 ]
 
 build-backend = "setuptools.build_meta"
diff --git a/setup.py b/setup.py
index 23bfe3d..867c722 100644
--- a/setup.py
+++ b/setup.py
@@ -23,8 +23,8 @@ def read(fname):
 
 setuptools.setup(
   name="dijkstra3d",
-  version="1.15.0",
-  python_requires=">=3.7,<4.0",
+  version="1.15.1",
+  python_requires=">=3.8,<4.0",
   setup_requires=['numpy','cython'],
   ext_modules=[
     setuptools.Extension(