diff --git a/requirements.txt b/requirements.txt
index d6ae7b4..e470465 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 numpy
 toml
-numba
\ No newline at end of file
+numba
+scipy
\ No newline at end of file
diff --git a/setup.py b/setup.py
index cc1e8f6..ab1061c 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,7 @@
     author="Yuxiang Gao",
     author_email="yuxiang.gao@jhu.edu",
     url="https://github.com/yuxiang-gao/PySocialForce",
-    install_requires=["numpy", "toml", "numba"],
+    install_requires=["numpy", "toml", "numba", "scipy"],
     extras_require={
         "dev": ["black", "jupyter"],
         "test": ["pylint", "pytest",],