diff --git a/README.md b/README.md
index 28a89f5d..da9b3859 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ PHYSBO was developed based on [COMBO](https://github.com/tsudalab/combo) for aca
 
 - Python >= 3.6
     - No longer tested with Python 3.6
-- NumPy
+- NumPy < 2.0.0
 - SciPy
 
 ## Install
diff --git a/docs/sphinx/manual/en/source/install.rst b/docs/sphinx/manual/en/source/install.rst
index 0a0740d9..dce4561b 100644
--- a/docs/sphinx/manual/en/source/install.rst
+++ b/docs/sphinx/manual/en/source/install.rst
@@ -8,7 +8,7 @@ Required Packages
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 * Python >= 3.6
-* numpy
+* numpy < 2.0.0
 * scipy
 
 Download and Install
diff --git a/docs/sphinx/manual/ja/source/install.rst b/docs/sphinx/manual/ja/source/install.rst
index 33d6b819..294cc07a 100644
--- a/docs/sphinx/manual/ja/source/install.rst
+++ b/docs/sphinx/manual/ja/source/install.rst
@@ -9,7 +9,7 @@
 PHYSBOの実行環境・必要なパッケージは以下の通りです。
 
 * Python >= 3.6
-* numpy
+* numpy < 2.0.0
 * scipy
 
 
diff --git a/setup.cfg b/setup.cfg
index 483327d7..a279db0b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -14,5 +14,5 @@ packages = find:
 zip_safe = False
 python_requires= >=3.6
 install_requires =
-    numpy
+    numpy < 2.0
     scipy