diff --git a/requirements/audio/audio_tts.txt b/requirements/audio/audio_tts.txt
index 81a5c6f4..8b33f02f 100644
--- a/requirements/audio/audio_tts.txt
+++ b/requirements/audio/audio_tts.txt
@@ -15,7 +15,7 @@ protobuf
 ptflops
 ptyprocess>=0.7.0
 pygments>=2.12.0
-pysptk>=0.1.15,<0.2.0
+pysptk>=0.1.15,<0.1.19
 pytorch_wavelets
 PyWavelets>=1.0.0
 scikit-learn