diff --git a/src/endpoint/mod.rs b/src/endpoint/mod.rs
index 241e45a..c32d0a2 100644
--- a/src/endpoint/mod.rs
+++ b/src/endpoint/mod.rs
@@ -198,8 +198,8 @@ impl Default for Builder {
         Self {
             svcs: Default::default(),
             discovery: crate::discovery::Endpoint {
-                max_protocol_version: 4,
-                min_protocol_version: 4,
+                max_protocol_version: 5,
+                min_protocol_version: 5,
                 protocol_mode: Some(crate::discovery::ProtocolMode::BidiStream),
                 services: vec![],
             },