diff --git a/python/pyproject.toml b/python/pyproject.toml
index c482c539f..672bd335e 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -41,6 +41,7 @@ runtime_common = [
     "pybase64",
     "python-multipart",
     "pyzmq>=25.1.2",
+    "sentencepiece",
     "soundfile==0.13.1",
     "scipy",
     "torchao==0.9.0",