diff --git a/setup.py b/setup.py
index dbfb8c0e4..0281570d2 100644
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@ if not _CYTHON_INSTALLED:
 # What packages are required for this module to be executed?
 # `estimator` may depend on other packages. In order to reduce dependencies, it is not written here.
 REQUIRED = [
-    "numpy>=1.12.0",
+    "numpy>=1.12.0,<=1.19.5",
     "pandas>=0.25.1",
     "scipy>=1.0.0",
     "requests>=2.18.0",