diff --git a/pyproject.toml b/pyproject.toml
index 4144bc456..df0fc0806 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,6 +42,7 @@ pyright = ">=1.1.284"
 poethepoet = "0.16.0"
 loguru = ">=0.6.0"
 pandas = "1.5.2"
+numpy = "<=1.23.5"
 typing-extensions = ">=4.2.0"
 matplotlib = ">=3.5.1"
 pre-commit = ">=2.19.0"