diff --git a/pyproject.toml b/pyproject.toml
index ca01bb2f..ff60a185 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ test = [
     "pytest",
     "pytest-cov",
     "coverage",
-    "numpy",
+    "numpy<1.23",
     "pandas",
     "matplotlib",
     "pyqt5",