diff --git a/requirements/readthedocs.txt b/requirements/readthedocs.txt
index cd16364f..b9e39901 100644
--- a/requirements/readthedocs.txt
+++ b/requirements/readthedocs.txt
@@ -1,3 +1,5 @@
+mmcls
 mmcv>=1.3.8
+ordered_set
 torch
 torchvision