diff --git a/pyproject.toml b/pyproject.toml
index e42111b70..bbb75da47 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,7 @@ dependencies = [
     "mitmproxy_rs>=0.5.1,<0.6",
     "msgpack>=1.0.0, <1.1.0",
     "passlib>=1.6.5, <1.8",
-    "protobuf>=3.14,<5",
+    "protobuf>=3.14,<6",
     "pydivert>=2.0.3,<2.2; sys_platform == 'win32'",
     "pyOpenSSL>=22.1,<24.2",
     "pyparsing>=2.4.2,<3.2",