diff --git a/Human-Action-Recognition-Using-Detectron2-And-Lstm/requirements.txt b/Human-Action-Recognition-Using-Detectron2-And-Lstm/requirements.txt
index 38b04edfe..249654377 100644
--- a/Human-Action-Recognition-Using-Detectron2-And-Lstm/requirements.txt
+++ b/Human-Action-Recognition-Using-Detectron2-And-Lstm/requirements.txt
@@ -3,7 +3,7 @@ Flask==1.1.2
 Flask-Bootstrap==3.3.7.1
 Flask-Uploads==0.2.1
 numpy==1.19.5
-opencv-python==4.1.2.30
+opencv-python==3.4.11.39
 pytorch_lightning==1.3.3
 torch==1.8.1
 torchvision==0.9.1