diff --git a/pyproject.toml b/pyproject.toml
index 25d9613..29015e9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ testcontainers = { version="^4.9.0", extras=["mongodb"] }
 types-deprecated = "^1.2.15.20241117"
 types-pygments = "^2.18.0.20240506"
 types-colorama = "^0.4.15.20240311"
-types-protobuf = "^5.29.1.20241207"
+types-protobuf = ">=5.29.1.20241207,<7.0.0.0"
 types-psutil = "^6.1.0.20241221"
 types-pyopenssl = "^24.1.0.20240722"
 types-ujson = "^5.10.0.20240515"