diff --git a/setup.py b/setup.py
index e49d6b5..45633e5 100644
--- a/setup.py
+++ b/setup.py
@@ -53,7 +53,7 @@
     "colorlog",
     "isodate>=0.5.4",
     "numba",  # just-in-time compilation
-    "numpy>=1.20.0",  # 1.20.0 required for numpy.typing
+    "numpy>=1.20.0,<2.0",  # 1.20.0 required for numpy.typing
     "openpyxl",
     "pandas",
     "pendulum>=2.1.1",