diff --git a/requirements.txt b/requirements.txt
index 1251707..cda3f44 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 numpy>=1.8.2
-scipy
+scipy>=1.6.3
 cython>=0.21.1
 pandas>=0.14.1
 xarray>=0.7.2