diff --git a/dygraph/requirements.txt b/dygraph/requirements.txt
index c50d347b2db37371ddd5ab48d840f7399e3cea0a..fa1327c3cbc06da642f077e2d294903f5f3089cb 100644
--- a/dygraph/requirements.txt
+++ b/dygraph/requirements.txt
@@ -5,3 +5,4 @@ opencv-python
 PyYAML
 shapely
 scipy
+pycocotools