diff --git a/flask-server/requirements.txt b/flask-server/requirements.txt
index 504b7f1..6dca962 100644
--- a/flask-server/requirements.txt
+++ b/flask-server/requirements.txt
@@ -28,6 +28,7 @@ requests==2.32.3
 reportlab==4.4.1
 scipy>=1.13.0
 setuptools==75.6.0
+SimpleITK>=2.4.0
 SQLAlchemy==2.0.37
 typing_extensions==4.12.2
 tzlocal==5.2