diff --git a/requirements/required.old b/requirements/required.old
index d3e04600dd1..6a3c89a3efb 100644
--- a/requirements/required.old
+++ b/requirements/required.old
@@ -23,3 +23,7 @@ timm==0.4.12
 torch==1.12.0
 torchmetrics==0.10.0
 torchvision==0.13.0
+
+# Required dependency of lightning, wasn't properly listed until 1.9
+# https://github.com/Lightning-AI/lightning/pull/16302
+websockets
\ No newline at end of file