diff --git a/gguf-py/pyproject.toml b/gguf-py/pyproject.toml
index eea381e5a..113b860f8 100644
--- a/gguf-py/pyproject.toml
+++ b/gguf-py/pyproject.toml
@@ -23,6 +23,7 @@ python = ">=3.8"
 numpy = ">=1.17"
 tqdm = ">=4.27"
 pyyaml = ">=5.1"
+sentencepiece = ">=0.2.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"