diff --git a/crates/rmcp/src/model.rs b/crates/rmcp/src/model.rs
index 001f4b60..dbfd5ae6 100644
--- a/crates/rmcp/src/model.rs
+++ b/crates/rmcp/src/model.rs
@@ -1545,12 +1545,13 @@ pub enum Role {
 }
 
 /// Tool selection mode (SEP-1577).
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]
 #[serde(rename_all = "lowercase")]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 #[expect(clippy::exhaustive_enums, reason = "intentionally exhaustive")]
 pub enum ToolChoiceMode {
     /// Model decides whether to use tools
+    #[default]
     Auto,
     /// Model must use at least one tool
     Required,
@@ -1558,12 +1559,6 @@ pub enum ToolChoiceMode {
     None,
 }
 
-impl Default for ToolChoiceMode {
-    fn default() -> Self {
-        Self::Auto
-    }
-}
-
 /// Tool choice configuration (SEP-1577).
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]
 #[serde(rename_all = "camelCase")]
diff --git a/crates/rmcp/src/transport/auth.rs b/crates/rmcp/src/transport/auth.rs
index 3f9b06e3..34674df7 100644
--- a/crates/rmcp/src/transport/auth.rs
+++ b/crates/rmcp/src/transport/auth.rs
@@ -19,7 +19,7 @@ use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use thiserror::Error;
 use tokio::sync::{Mutex, RwLock};
-use tracing::{debug, error, warn};
+use tracing::{debug, warn};
 
 use crate::transport::common::http_header::HEADER_MCP_PROTOCOL_VERSION;
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 0968bb9d..f04d1f29 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.90"
+channel = "1.92"
 components = ["rustc", "rust-std", "cargo", "clippy", "rustfmt", "rust-docs"]