diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 861fc37..39b5b65 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,7 +16,7 @@ jobs:
           - nightly
           - beta
           - stable
-          - 1.56.0
+          - 1.57.0
 
     steps:
     - uses: actions/checkout@v3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21f2bac..d3e1466 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Changelog
 
-## 0.13.0 - Unreleased
+## 0.12.3 - Unreleased
+
+- Bump MSRV (Minimum Supported Rust Version) from 1.56.0 to 1.57.0 [`#80`](https://github.com/rust-syndication/atom/pull/80)
 
 ## 0.12.2 - 2023-07-26
 
diff --git a/README.md b/README.md
index 99d2376..29b91ff 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Library for serializing the Atom web content syndication format.
 
 [Documentation](https://docs.rs/atom_syndication/)
 
-This crate requires *Rustc version 1.56.0 or greater*.
+This crate requires *Rustc version 1.57.0 or greater*.
 
 ## Usage
 
@@ -16,14 +16,14 @@ Add the dependency to your `Cargo.toml`.
 
 ```toml
 [dependencies]
-atom_syndication = "0.11"
+atom_syndication = "0.12"
 ```
 
 Or, if you want [Serde](https://github.com/serde-rs/serde) include the feature like this:
 
 ```toml
 [dependencies]
-atom_syndication = { version = "0.11", features = ["with-serde"] }
+atom_syndication = { version = "0.12", features = ["with-serde"] }
 ```
 
 The package includes a single crate named `atom_syndication`.