diff --git a/requirements.txt b/requirements.txt
index ba3fc35..b20a846 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 Cython==0.29.21
 librosa==0.9.2
+matplotlib==3.3.1
 scikit-learn==1.0.2
 scipy==1.5.2
 numpy==1.21.6