diff --git a/requirements.txt b/requirements.txt
index 30660e9..a0130d2 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,4 +21,4 @@ git+https://github.com/cocodataset/cocoapi.git#subdirectory=PythonAPI
 # conda install -yc conda-forge scikit-image pycocotools tensorboard
 # conda install -yc spyder-ide spyder-line-profiler
 # conda install -yc pytorch pytorch torchvision
-# conda install -yc conda-forge protobuf numpy && pip install onnx  # https://github.com/onnx/onnx#linux-and-macos
+# conda install -yc conda-forge protobuf numpy && pip install onnx==1.6.0  # https://github.com/onnx/onnx#linux-and-macos