diff --git a/requirements.txt b/requirements.txt
index 63a493e7e59c09a6a189eb7ffc5eecdf9dadf4f8..1d87e5b26ad044f5844f5999cbe6ee098f589a04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 contextlib2
 coverage
 numba
-numpy
+numpy==1.23.1
 pygraphviz
 pytest
 pytest-cov