diff --git a/py_bind/requirements.txt b/py_bind/requirements.txt
index 148aabd..92c2c4f 100644
--- a/py_bind/requirements.txt
+++ b/py_bind/requirements.txt
@@ -1,5 +1,5 @@
-cython
+cython"<3"
 nose
-numpy
+numpy"<1.24"
 pyyaml
 six