diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3cf1c09..596655b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
+### Breaking changes
+
+* Bump minimum supported Rust version (MSRV) to 1.91.0.
+
 ## [0.30.1] 2026-06-03
 
 ### Improvements
diff --git a/Cargo.toml b/Cargo.toml
index b6052f8..f4c7ff7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,7 @@ homepage = "https://github.com/fast/logforth"
 license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/fast/logforth"
-rust-version = "1.89.0"
+rust-version = "1.91.0"
 
 [workspace.dependencies]
 # Workspace dependencies
diff --git a/README.md b/README.md
index adf4dbf..418bc8c 100644
--- a/README.md
+++ b/README.md
@@ -2,14 +2,14 @@
 
 [![Crates.io][crates-badge]][crates-url]
 [![Documentation][docs-badge]][docs-url]
-[![MSRV 1.89][msrv-badge]](https://www.whatrustisit.com)
+[![MSRV 1.91][msrv-badge]](https://www.whatrustisit.com)
 [![Apache 2.0 licensed][license-badge]][license-url]
 [![Build Status][actions-badge]][actions-url]
 
 [crates-badge]: https://img.shields.io/crates/v/logforth.svg
 [crates-url]: https://crates.io/crates/logforth
 [docs-badge]: https://docs.rs/logforth/badge.svg
-[msrv-badge]: https://img.shields.io/badge/MSRV-1.89-green?logo=rust
+[msrv-badge]: https://img.shields.io/badge/MSRV-1.91-green?logo=rust
 [docs-url]: https://docs.rs/logforth
 [license-badge]: https://img.shields.io/crates/l/logforth
 [license-url]: LICENSE
@@ -226,7 +226,7 @@ Components are organized into several crates:
 
 ## Minimum Rust version policy
 
-This crate is built against the latest stable release, and its minimum supported rustc version is 1.89.0.
+This crate is built against the latest stable release, and its minimum supported rustc version is 1.91.0.
 
 The policy is that the minimum Rust version required to use this crate can be increased in minor version updates. For example, if Logforth 1.0 requires Rust 1.60.0, then Logforth 1.0.z for all values of z will also require Rust 1.60.0 or newer. However, Logforth 1.y for y > 0 may require a newer minimum version of Rust.