diff --git a/pyproject.toml b/pyproject.toml
index 9e90a72..74f4b9e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
 dependencies = [
-  "Cython==3.0.10",
+  "cython==3.0.10",
   "deepmultilingualpunctuation==1.0.1",
   "nemo_toolkit[asr]==1.23.0",
   "tensorrt_llm==0.9.0.dev2024032600",