diff --git a/setup.py b/setup.py
index 388f905..705a6b6 100755
--- a/setup.py
+++ b/setup.py
@@ -62,6 +62,9 @@ setup(
         ],
     },
     python_requires='>=3.5',
+    install_requires=[
+        'psutil',
+    ],
     tests_require=[
         'pytest',
         'pytest-cov',