diff --git a/pyproject.toml b/pyproject.toml
index 28e961f..0ab95cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,6 +8,7 @@ packages = [{include = "rbproto"}]
 
 [tool.poetry.dependencies]
 python = ">=3.10,<3.12"
+protobuf = "^4.25.3"
 
 
 [build-system]