diff --git a/python/pyproject.toml b/python/pyproject.toml
index c9f2abf..3a577ff 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -15,7 +15,7 @@ description = "KCL Programming Language Python Lib"
 license = { text = "Apache-2.0" }
 
 dependencies = [
-    "protobuf>=4.25.3"
+    "protobuf>=6.33.1"
 ]
 
 [tool.maturin]