diff --git a/requirements.txt b/requirements.txt
index d8a4df3b12..8580fb7593 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,3 +26,6 @@ parameterized==0.8.1
 
 # windows-specific
 pypiwin32;platform_system=="Windows"
+
+# xyzroom contrib
+scipy==1.7.1