diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 388b55a..3db8ca5 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,7 @@ jobs:
       - uses: 'actions/checkout@v4'
       - uses: 'Swatinem/rust-cache@v2'
       - name: 'Run formatter'
-        run: cargo fmt --all --check
+        run: cargo +nightly fmt --all --check
       - name: 'Run linter'
         run: cargo clippy --workspace --all-targets --all-features --locked
   test:
diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 0000000..4d02947
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,3 @@
+group_imports = "StdExternalCrate"
+imports_granularity = "Module"
+unstable_features = true
diff --git a/src/commands/info.rs b/src/commands/info.rs
index 029f6f4..7302621 100644
--- a/src/commands/info.rs
+++ b/src/commands/info.rs
@@ -1,12 +1,12 @@
 /* 'info' command displays data from config-file.
  */
-use crate::versioning;
-use crate::workspace::Workspace;
-
 use anyhow::Result;
 use clap::Args;
 use tera::{Context, Tera};
 
+use crate::versioning;
+use crate::workspace::Workspace;
+
 #[derive(Args)]
 pub(crate) struct Arguments {}
 
diff --git a/src/commands/init.rs b/src/commands/init.rs
index 9b62893..2bb5886 100644
--- a/src/commands/init.rs
+++ b/src/commands/init.rs
@@ -1,13 +1,14 @@
-use crate::config;
-use crate::config::age_toml;
-use anyhow::{anyhow, Result};
 use std::env::current_dir;
 use std::fs::File;
 use std::io::prelude::*;
 
+use anyhow::{anyhow, Result};
 use clap::Args;
 use tera::{Context, Tera};
 
+use crate::config;
+use crate::config::age_toml;
+
 const TEMPLATE_BASE: &'static str = r#"
 current_version = "{{ current_version }}"
 
diff --git a/src/commands/major.rs b/src/commands/major.rs
index c3edf83..07cc4b8 100644
--- a/src/commands/major.rs
+++ b/src/commands/major.rs
@@ -1,8 +1,9 @@
-use crate::versioning::up_major;
-use crate::workspace::{make_context, Workspace};
 use anyhow::Result;
 use clap::Args;
 
+use crate::versioning::up_major;
+use crate::workspace::{make_context, Workspace};
+
 #[derive(Args)]
 pub(crate) struct Arguments {}
 
diff --git a/src/commands/minor.rs b/src/commands/minor.rs
index 42d4da6..ad4f836 100644
--- a/src/commands/minor.rs
+++ b/src/commands/minor.rs
@@ -1,8 +1,9 @@
-use crate::versioning::up_minor;
-use crate::workspace::{make_context, Workspace};
 use anyhow::Result;
 use clap::Args;
 
+use crate::versioning::up_minor;
+use crate::workspace::{make_context, Workspace};
+
 #[derive(Args)]
 pub(crate) struct Arguments {}
 
diff --git a/src/commands/patch.rs b/src/commands/patch.rs
index 603d55f..a381320 100644
--- a/src/commands/patch.rs
+++ b/src/commands/patch.rs
@@ -1,8 +1,9 @@
-use crate::versioning::up_patch;
-use crate::workspace::{make_context, Workspace};
 use anyhow::Result;
 use clap::Args;
 
+use crate::versioning::up_patch;
+use crate::workspace::{make_context, Workspace};
+
 #[derive(Args)]
 pub(crate) struct Arguments {}
 
diff --git a/src/commands/update.rs b/src/commands/update.rs
index ed682f2..329f1d6 100644
--- a/src/commands/update.rs
+++ b/src/commands/update.rs
@@ -1,8 +1,9 @@
-use crate::workspace::{make_context, Workspace};
 use anyhow::Result;
 use clap::Args;
 use semver::Version;
 
+use crate::workspace::{make_context, Workspace};
+
 #[derive(Args)]
 pub(crate) struct Arguments {
     new_version: Version,
diff --git a/src/config.rs b/src/config.rs
index 63515f6..6abfc06 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,10 +1,11 @@
 // Configuration manager.
 
+use std::path::PathBuf;
+
 use anyhow::{anyhow, Result};
 use log::info;
 use semver::Version;
 use serde::{Deserialize, Serialize};
-use std::path::PathBuf;
 
 pub mod age_toml;
 mod cargo_toml;
diff --git a/src/config/age_toml.rs b/src/config/age_toml.rs
index 6a2d486..e0ef9a3 100644
--- a/src/config/age_toml.rs
+++ b/src/config/age_toml.rs
@@ -3,7 +3,8 @@ use std::io::prelude::*;
 use std::path::PathBuf;
 
 use anyhow::{anyhow, Result};
-use toml_edit::{de::from_document, value, DocumentMut};
+use toml_edit::de::from_document;
+use toml_edit::{value, DocumentMut};
 
 use super::{Config, ParseAvailable};
 
diff --git a/src/config/cargo_toml.rs b/src/config/cargo_toml.rs
index 2cbc56f..49504de 100644
--- a/src/config/cargo_toml.rs
+++ b/src/config/cargo_toml.rs
@@ -3,7 +3,8 @@ use std::io::prelude::*;
 use std::path::PathBuf;
 
 use anyhow::{anyhow, Result};
-use toml::{de::Error, Table};
+use toml::de::Error;
+use toml::Table;
 use toml_edit::{value, DocumentMut};
 
 use super::{Config, ParseAvailable};
diff --git a/src/config/pyproject_toml.rs b/src/config/pyproject_toml.rs
index 7449999..8832dd7 100644
--- a/src/config/pyproject_toml.rs
+++ b/src/config/pyproject_toml.rs
@@ -3,7 +3,8 @@ use std::io::prelude::*;
 use std::path::PathBuf;
 
 use anyhow::{anyhow, Result};
-use toml::{de::Error, Table};
+use toml::de::Error;
+use toml::Table;
 use toml_edit::{value, DocumentMut};
 
 use super::{Config, ParseAvailable};
diff --git a/src/main.rs b/src/main.rs
index ee65341..fee0944 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,11 @@
 // Entry point.
+use crate::commands::run_command;
+
 mod commands;
 mod config;
 mod versioning;
 mod workspace;
 mod writer;
-use crate::commands::run_command;
 
 fn main() {
     env_logger::init();
diff --git a/src/workspace.rs b/src/workspace.rs
index 09ec74f..94c61d8 100644
--- a/src/workspace.rs
+++ b/src/workspace.rs
@@ -1,8 +1,9 @@
+use std::path::PathBuf;
+
 use anyhow::{anyhow, Result};
 use chrono::{DateTime, Local};
 use log::debug;
 use semver::Version;
-use std::path::PathBuf;
 
 use crate::config::{resolve_config, Config, ConfigDocument};
 use crate::writer::Writer;
diff --git a/src/writer.rs b/src/writer.rs
index 80e156d..32ee69a 100644
--- a/src/writer.rs
+++ b/src/writer.rs
@@ -119,10 +119,10 @@ impl WriteRule {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-
     use semver::Version;
 
+    use super::*;
+
     #[test]
     fn new_writer() {
         let ctx = Context::new();