diff --git a/Cargo.toml b/Cargo.toml
index 8113148..96e5ae7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,13 +1,13 @@
 [package]
 name = "dshell"
 description = "DShell core session, channel, and wire-format foundation"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2024"
 repository = "https://github.com/genmeta/dssh"
 license = "Apache-2.0"
 
 [dependencies]
-h3x = { version = "0.3.1", features = [
+h3x = { version = "0.4.0", features = [
     "rpc",
     "serde",
     "webtransport",
diff --git a/src/test_support.rs b/src/test_support.rs
index 26904e9..032420b 100644
--- a/src/test_support.rs
+++ b/src/test_support.rs
@@ -199,6 +199,7 @@ impl MockWebTransportSession {
         self.provide_accept_stream(reader, writer);
     }
 
+    #[cfg(feature = "server")]
     pub(crate) fn open_called(&self) -> bool {
         self.state.open_count.load(Ordering::SeqCst) > 0
     }