diff --git a/.gitignore b/.gitignore
index ab2518d..19d97e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -149,5 +149,5 @@ com_crashlytics_export_strings.xml
 crashlytics.properties
 crashlytics-build.properties
 fabric.properties
-
-ibmq/.ibmq_key
\ No newline at end of file
+qwrapper/playground.py
+ibmq/.ibmq_key
diff --git a/qwrapper/hamiltonian.py b/qwrapper/hamiltonian.py
index 679aaa3..6bc8d5c 100644
--- a/qwrapper/hamiltonian.py
+++ b/qwrapper/hamiltonian.py
@@ -1,13 +1,12 @@
 import logging
 
-import numpy
-
 from qwrapper.obs import Hamiltonian
 from qwrapper.operator import ControllablePauli
 
 try:
     import cupy as np
 except ModuleNotFoundError:
+    print("cupy not found. numpy is used.")
     import numpy as np
 
 
@@ -69,7 +68,7 @@ def to_matrix_hamiltonian(hamiltonian: Hamiltonian):
         else:
             result += (h + 0j) * o.to_matrix()
         count += 1
-    return result + numpy.diag([hamiltonian._identity] * len(result))
+    return result + np.diag([hamiltonian._identity] * len(result))
 
 
 def compute_ground_state(hamiltonian: Hamiltonian):
diff --git a/qwrapper/obs.py b/qwrapper/obs.py
index 1c84b20..c916eb1 100644
--- a/qwrapper/obs.py
+++ b/qwrapper/obs.py
@@ -8,6 +8,7 @@
 try:
     import cupy as np
 except ModuleNotFoundError:
+    print("cupy not found. numpy is used.")
     import numpy as np
 
 
@@ -22,10 +23,10 @@ def build_operator_str(p_string):
 
 
 class Pauli:
-    X = np.matrix([[0, 1], [1, 0]])
-    Y = np.matrix([[0, -1j], [1j, 0]])
-    Z = np.matrix([[1, 0], [0, -1]])
-    I = np.matrix([[1, 0], [0, 1]])
+    X = np.array([[0, 1], [1, 0]])
+    Y = np.array([[0, -1j], [1j, 0]])
+    Z = np.array([[1, 0], [0, -1]])
+    I = np.array([[1, 0], [0, 1]])
 
 
 class Obs(abc.ABC):
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..0812fbf
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,5 @@
+qiskit>=0.30.0
+Qulacs>=0.3.0
+matplotlib>=3.0.0
+pylatexenc>=2.0
+qutip>=4.7.0
diff --git a/setup.py b/setup.py
index ada7988..3ed0b4d 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="qwrapper",
-    version="0.4.25",
+    version="0.4.26",
     author="kouhei nakaji",
     author_email="nakajijiji@gmail.com",
     description="You can receive the message 'Hello!!!'",