diff --git a/contrib/pyln-testing/pyproject.toml b/contrib/pyln-testing/pyproject.toml
index 04739676c..f9c3ebea5 100644
--- a/contrib/pyln-testing/pyproject.toml
+++ b/contrib/pyln-testing/pyproject.toml
@@ -22,7 +22,7 @@ Flask = "^2.0.3"
 cheroot = "^8.6.0"
 psutil = "^5.9.0"
 grpcio = ">=1.47"
-protobuf = ">=3.20.3,<4"
+protobuf = ">=3.20.3"
 
 [tool.poetry.dev-dependencies]
 pyln-client = { path = "../pyln-client", develop = true}