diff --git a/setup.py b/setup.py
index 73cd5db4..8866899f 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@
 requirements = [
     "appdirs >= 1.4.3",
     "decorator",
-    "numpy >= 1.14.0, != 1.15.3",
+    "numpy >= 1.14.0, != 1.15.3, < 2.0.0",
     "numba >= 0.53.1",
 ]