diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e9d31be..48c2939 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -73,7 +73,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        msrv: ["1.70.0"]
+        msrv: ["1.81.0"]
         os: ["ubuntu", "macOS", "windows"]
     runs-on: ${{ matrix.os }}-latest
     steps:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c845c75..f3d4860 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,20 @@ All user visible changes to this project will be documented in this file. This p
 
 
 
+## [0.2.0] · 202?-??-?? (unreleased)
+[0.2.0]: /../../tree/v0.2.0
+
+[Diff](/../../compare/v0.1.1...v0.2.0)
+
+### BC Breaks
+
+- Bumped up [MSRV] to 1.81 because for `#[expect]` attribute usage. ([todo])
+
+[todo]: /../../commit/todo
+
+
+
+
 ## [0.1.1] · 2023-12-04
 [0.1.1]: /../../tree/v0.1.1
 
@@ -33,4 +47,5 @@ All user visible changes to this project will be documented in this file. This p
 
 
 
+[MSRV]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-rust-version-field
 [Semantic Versioning 2.0.0]: https://semver.org
diff --git a/Cargo.toml b/Cargo.toml
index 70d94f6..3c252ce 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "tracing-record-hierarchical"
 version = "0.1.1"
 edition = "2021"
-rust-version = "1.70"
+rust-version = "1.81"
 description = "Record parent `tracing::Span` fields from inside child `tracing::Span`'s context."
 authors = ["Instrumentisto Team <developer@instrumentisto.com>"]
 license = "MIT OR Apache-2.0"
diff --git a/README.md b/README.md
index da64fd2..5913817 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 =============================
 
 [![crates.io](https://img.shields.io/crates/v/tracing-record-hierarchical.svg "crates.io")](https://crates.io/crates/tracing-record-hierarchical)
-[![Rust 1.70+](https://img.shields.io/badge/rustc-1.70+-lightgray.svg "Rust 1.70+")](https://blog.rust-lang.org/2023/06/01/Rust-1.70.0.html)
+[![Rust 1.81+](https://img.shields.io/badge/rustc-1.81+-lightgray.svg "Rust 1.81+")](https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html)
 [![Unsafe Forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg "Unsafe forbidden")](https://github.com/rust-secure-code/safety-dance)
 [![CI](https://github.com/instrumentisto/tracing-record-hierarchical-rs/workflows/CI/badge.svg?branch=main "CI")](https://github.com/instrumentisto/tracing-record-hierarchical-rs/actions?query=workflow%3ACI+branch%3Amain)
 [![Rust docs](https://docs.rs/tracing-record-hierarchical/badge.svg "Rust docs")](https://docs.rs/tracing-record-hierarchical)
diff --git a/src/lib.rs b/src/lib.rs
index f07d954..da329e2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -22,10 +22,13 @@
 #![forbid(non_ascii_idents, unsafe_code)]
 #![warn(
     clippy::absolute_paths,
+    clippy::allow_attributes,
+    clippy::allow_attributes_without_reason,
     clippy::as_conversions,
     clippy::as_ptr_cast_mut,
     clippy::assertions_on_result_states,
     clippy::branches_sharing_code,
+    clippy::cfg_not_test,
     clippy::clear_with_drain,
     clippy::clone_on_ref_ptr,
     clippy::collection_is_never_read,
@@ -96,6 +99,7 @@
     clippy::rest_pat_in_fully_bound_structs,
     clippy::same_name_method,
     clippy::semicolon_inside_block,
+    clippy::set_contains_or_insert,
     clippy::shadow_unrelated,
     clippy::significant_drop_in_scrutinee,
     clippy::significant_drop_tightening,
@@ -236,7 +240,10 @@ where
     V: field::Value,
 {
     _ = span.with_subscriber(|(id, dispatch)| {
-        #[allow(clippy::expect_used)] // intentional
+        #[expect( // intentional
+            clippy::expect_used,
+            reason = "no other error reporting is possible here",
+        )]
         let ctx = dispatch.downcast_ref::<HierarchicalRecord>().expect(
             "add `HierarchicalRecord` `Layer` to your `tracing::Subscriber`",
         );