diff --git a/speech/speech_synthesis/tacotron2/pytorch/requirements.txt b/speech/speech_synthesis/tacotron2/pytorch/requirements.txt
index 2ffd78645dde360c48a23393f04d23234d36a3fd..77c339624d127a5f30e2d4520202e619911ac837 100644
--- a/speech/speech_synthesis/tacotron2/pytorch/requirements.txt
+++ b/speech/speech_synthesis/tacotron2/pytorch/requirements.txt
@@ -1,4 +1,4 @@
-matplotlib
+matplotlib==3.7.0
 numpy
 inflect==0.2.5
 scipy