diff --git a/pyproject.toml b/pyproject.toml
index dd9bdcc..634d9c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ classifiers = [
 ]
 dependencies = [
     "websockets>=11.0.3,<12.0.0",
-    "protobuf>=4.23.4,<5.0.0",
+    "protobuf>=4.23.4,<6.0.0",
 ]
 
 dynamic = ["version"]