diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 1bc2fcb..6bd802c 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -1,13 +1,13 @@
 name: Python package
 
-on: [push, pull_request]
+on: [pull_request]
 
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10']
+        python-version: [3.7, 3.8, 3.9, '3.10', '3.11']
 
     steps:
       - uses: actions/checkout@v2
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..fa7093a
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools>=42"]
+build-backend = "setuptools.build_meta"
\ No newline at end of file
diff --git a/requirements-test.txt b/requirements-test.txt
index 24ce15a..b4db3f4 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1 +1 @@
-numpy
+numpy<=1.23.0
diff --git a/setup.py b/setup.py
index 6aa7313..8a21aea 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@
 ]
 
 if USE_CYTHON:
-    from Cython.Build import cythonize
+    from Cython.Build import cythonize # noqa
 
     extensions = cythonize(extensions)