diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7f3df581..c0d76cdd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -80,8 +80,8 @@ jobs:
         set -euo pipefail
 
         # Install the appropriate version of Rust.
-        rustup toolchain install 1.72.0 # [ref:rust_1.72.0]
-        rustup default 1.72.0 # [ref:rust_1.72.0]
+        rustup toolchain install 1.73.0 # [ref:rust_1.73.0]
+        rustup default 1.73.0 # [ref:rust_1.73.0]
 
         # Add the targets.
         rustup target add x86_64-pc-windows-msvc
@@ -120,8 +120,8 @@ jobs:
         set -euo pipefail
 
         # Install the appropriate version of Rust.
-        rustup toolchain install 1.72.0 # [ref:rust_1.72.0]
-        rustup default 1.72.0 # [ref:rust_1.72.0]
+        rustup toolchain install 1.73.0 # [ref:rust_1.73.0]
+        rustup default 1.73.0 # [ref:rust_1.73.0]
 
         # Add the targets.
         rustup target add x86_64-apple-darwin
@@ -193,8 +193,8 @@ jobs:
         set -euo pipefail
 
         # Install the appropriate version of Rust.
-        rustup toolchain install 1.72.0 # [ref:rust_1.72.0]
-        rustup default 1.72.0 # [ref:rust_1.72.0]
+        rustup toolchain install 1.73.0 # [ref:rust_1.73.0]
+        rustup default 1.73.0 # [ref:rust_1.73.0]
 
         # Fetch the program version.
         VERSION="$(cargo pkgid | cut -d# -f2 | cut -d: -f2)"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e9b894f..a09d987a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.9.7] - 2023-08-24
+## [0.9.7] - 2023-10-06
 
 ### Changed
 - Some redundant conversions are no longer emitted by the Rust code generator.
diff --git a/src/identifier.rs b/src/identifier.rs
index 99f37d3f..18bf9d8e 100644
--- a/src/identifier.rs
+++ b/src/identifier.rs
@@ -32,7 +32,7 @@ impl Eq for Identifier {}
 
 impl PartialOrd for Identifier {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        self.snake_case.partial_cmp(&other.snake_case)
+        Some(self.cmp(other))
     }
 }
 
diff --git a/toast.yml b/toast.yml
index 55c6cb88..ad3b37ef 100644
--- a/toast.yml
+++ b/toast.yml
@@ -17,11 +17,11 @@ command_prefix: |
   cargo-offline () { cargo --frozen --offline "$@"; }
 
   # Use this wrapper for formatting code or checking that code is formatted. We use a nightly Rust
-  # version for the `trailing_comma` formatting option [tag:rust_fmt_nightly_2023-08-24]. The
+  # version for the `trailing_comma` formatting option [tag:rust_fmt_nightly_2023-10-06]. The
   # nightly version was chosen as the latest available release with all components present
   # according to this page:
   #   https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu.html
-  cargo-fmt () { cargo +nightly-2023-08-24 --frozen --offline fmt --all -- "$@"; }
+  cargo-fmt () { cargo +nightly-2023-10-06 --frozen --offline fmt --all -- "$@"; }
 tasks:
   install_packages:
     description: Install system packages.
@@ -66,18 +66,18 @@ tasks:
       - install_packages
       - create_user
     command: |
-      # Install stable Rust [tag:rust_1.72.0].
+      # Install stable Rust [tag:rust_1.73.0].
       curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- \
         -y \
-        --default-toolchain 1.72.0 \
+        --default-toolchain 1.73.0 \
         --profile minimal \
         --component clippy
 
       # Add Rust tools to `$PATH`.
       . "$HOME/.cargo/env"
 
-      # Install nightly Rust [ref:rust_fmt_nightly_2023-08-24].
-      rustup toolchain install nightly-2023-08-24 --profile minimal --component rustfmt
+      # Install nightly Rust [ref:rust_fmt_nightly_2023-10-06].
+      rustup toolchain install nightly-2023-10-06 --profile minimal --component rustfmt
 
   install_tools:
     description: Install the tools needed to build and validate the program.