diff --git a/pyproject.toml b/pyproject.toml
index 05bcebc..d233b65 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ python = "^3.7"
 typing-extensions = ">=3.10.0"
 googleapis-common-protos = ">=1.56.4"
 grpc-stubs = ">=1.24.9"
-types-protobuf = "^3.20.4.2"
+types-protobuf = ">=3.20.4.2"
 
 [tool.poetry.dev-dependencies]
 protobuf = "^4.21.9"