diff --git a/setup.py b/setup.py
index 3ffc359..3fe38d6 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,5 @@
     url="https://github.com/ClandininLab/pijm",
     packages=["pijm"],
     python_requires=">=3.6",
-    install_requires=[
-        "matplotlib",
-    ],
+    install_requires=["matplotlib", "numpy"],
 )