diff --git a/backend/tests/support/example_data_seeding_world.rs b/backend/tests/support/example_data_seeding_world.rs
index 0ad8a886a..01fd86da3 100644
--- a/backend/tests/support/example_data_seeding_world.rs
+++ b/backend/tests/support/example_data_seeding_world.rs
@@ -1,4 +1,8 @@
 //! Support types and step definitions for example data startup seeding scenarios.
+#![expect(
+    clippy::redundant_field_names,
+    reason = "diesel's `QueryableByName` expansion initialises fields as `count: count`"
+)]
 
 use std::path::PathBuf;
 use std::sync::Arc;
diff --git a/crates/example-data/src/seed_registry_cli/error.rs b/crates/example-data/src/seed_registry_cli/error.rs
index 0782ce593..cb04e3888 100644
--- a/crates/example-data/src/seed_registry_cli/error.rs
+++ b/crates/example-data/src/seed_registry_cli/error.rs
@@ -1,4 +1,8 @@
 //! Error types for the seed registry CLI.
+#![expect(
+    clippy::redundant_field_names,
+    reason = "thiserror's `#[from]` expansion initialises the field as `source: source`"
+)]
 
 use thiserror::Error;
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 6fc77c757..c07a8e573 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -3,6 +3,6 @@
 # 1.99.0-nightly 2026-07-13 macro-expansion ICE). Bump this date deliberately
 # after verifying the workspace builds green on the new nightly.
 [toolchain]
-channel = "nightly-2026-06-29"
+channel = "nightly-2026-10-23"
 components = ["rustfmt", "clippy", "rust-analyzer"]
 profile = "minimal"