diff --git a/detection/requirements.txt b/detection/requirements.txt
index ada3864de..69dd6c608 100644
--- a/detection/requirements.txt
+++ b/detection/requirements.txt
@@ -2,3 +2,4 @@ monai-weekly[nibabel]
 itk>=5.2; python_version < "3.10"
 tensorboard
 torchvision
+opencv-python