diff --git a/py_bind/pyproject.toml b/py_bind/pyproject.toml
index 4f45da8..9e51ca3 100644
--- a/py_bind/pyproject.toml
+++ b/py_bind/pyproject.toml
@@ -12,4 +12,4 @@ requires = [
 before-build = "pip install numpy cython && cd py_bind && python setup.py prepare"
 test-requires = ["nose","six"]
 test-command = "cd {project}/py_bind/test && nosetests"
-skip = ["cp310-*","pp*"]
+skip = ["cp311-*","pp*"]
diff --git a/py_bind/requirements.txt b/py_bind/requirements.txt
index 148aabd..76846f3 100644
--- a/py_bind/requirements.txt
+++ b/py_bind/requirements.txt
@@ -1,5 +1,5 @@
-cython
+cython >=0.29.28,<3.0a0
 nose
-numpy
+numpy >=1.23, <1.24
 pyyaml
 six