diff --git a/pyproject.toml b/pyproject.toml
index 0e00e6d818..e5e63618d1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,2 +1,3 @@
 [build-system]
-requires = ["setuptools", "wheel", "urllib3<1.26", "conan>=1.22.2", "scikit-build", "cmake!=3.17.1,!=3.17.0", "ninja", "pybind11>2.4", "Cython>0.27.1"]
+requires = ["setuptools", "wheel", "urllib3<1.26", "conan>=1.22.2", "scikit-build", 
+  "cmake!=3.17.1,!=3.17.0", "ninja", "pybind11>2.4", "numpy>1.16.3"]
diff --git a/qiskit/providers/aer/library/save_amplitudes2 copy.py b/qiskit/providers/aer/library/save_amplitudes2 copy.py
new file mode 100644
index 0000000000..2e5289c5c5
--- /dev/null
+++ b/qiskit/providers/aer/library/save_amplitudes2 copy.py	
@@ -0,0 +1 @@
+                 conditional=False):
diff --git a/setup.py b/setup.py
index cf88f2b5e9..f2f9faf87b 100644
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,11 @@
 except ImportError:
     subprocess.call([sys.executable, '-m', 'pip', 'install', 'pybind11>=2.4'])
 
+try:
+    from numpy import array
+except ImportError:
+    subprocess.call([sys.executable, '-m', 'pip', 'install', 'numpy>=1.16.3'])
+
 from skbuild import setup