diff --git a/requirements-test.txt b/requirements-test.txt
index 4a885c6..c1441f4 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -10,5 +10,5 @@ ray[tune]
 torch==1.12.0
 torchmetrics
 torchvision
-protobuf<=3.20.1
+protobuf<4.21.9
 jsonargparse>=4.13.2