diff --git a/requirements.txt b/requirements.txt
index d5931e49a9..1c548c50a8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ onnx
 onnxruntime
 --extra-index-url https://pypi.ngc.nvidia.com
 dill
+kaldifst