diff --git a/requirements-training.txt b/requirements-training.txt
index 4b1be6cef9..82f0331314 100644
--- a/requirements-training.txt
+++ b/requirements-training.txt
@@ -4,6 +4,6 @@ h5py
 numpy >= 1.16.6
 onnx
 packaging
-protobuf
+protobuf >= 3.12.2, <= 3.20.1
 sympy
 setuptools>=41.4.0