diff --git a/requirements.txt b/requirements.txt
index 7634a59..e7a451e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,5 +3,6 @@ tqdm==4.45.0
 librosa==0.7.2
 opencv-python
 numba==0.48.0
+numpy==1.13.0
 SoundFile
 soundstretch