diff --git a/README.md b/README.md
index 9f1069a5..9702d3d4 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,7 @@ Just run `topgrade`. It will run the following steps:
 * Node
   * Run `yarn global update` if yarn is installed.
   * Run `npm update -g` if NPM is installed and `npm root -g` is a path inside your home directory.
+* Run `composer global update` if Composer's home directory is inside the home directory of the user.
 * Upgrade Atom packages
 * Run `gem upgrade --user-install` if `~/.gem` exists
 * *Linux*: Update Flatpak packages
diff --git a/src/generic.rs b/src/generic.rs
index 598d1b4d..970c2155 100644
--- a/src/generic.rs
+++ b/src/generic.rs
@@ -3,6 +3,8 @@ use super::terminal::Terminal;
 use super::utils::{self, Check, PathExt};
 use directories::BaseDirs;
 use failure::Error;
+use std::path::PathBuf;
+use std::process::Command;
 
 const EMACS_UPGRADE: &str = include_str!("emacs.el");
 
@@ -145,3 +147,39 @@ pub fn run_custom_command(name: &str, command: &str, terminal: &mut Terminal, dr
 
     Ok(())
 }
+
+#[must_use]
+pub fn run_composer_update(
+    base_dirs: &BaseDirs,
+    terminal: &mut Terminal,
+    dry_run: bool,
+) -> Option<(&'static str, bool)> {
+    if let Some(composer) = utils::which("composer") {
+        let composer_home = || -> Result<PathBuf, Error> {
+            let output = Command::new(&composer)
+                .args(&["global", "config", "--absolute", "home"])
+                .output()?;
+            output.status.check()?;
+            Ok(PathBuf::from(&String::from_utf8(output.stdout)?))
+        }();
+
+        if let Ok(composer_home) = composer_home {
+            if composer_home.is_descendant_of(base_dirs.home_dir()) {
+                terminal.print_separator("Composer");
+
+                let success = || -> Result<(), Error> {
+                    Executor::new(&composer, dry_run)
+                        .args(&["global", "update"])
+                        .spawn()?
+                        .wait()?
+                        .check()?;
+                    Ok(())
+                }().is_ok();
+
+                return Some(("Composer", success));
+            }
+        }
+    }
+
+    None
+}
diff --git a/src/main.rs b/src/main.rs
index 9cc63ade..cf44d467 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -230,6 +230,10 @@ fn run() -> Result<(), Error> {
         |terminal| node::run_npm_upgrade(&base_dirs, terminal, opt.dry_run),
         &mut terminal,
     ));
+    report.push_result(execute(
+        |terminal| generic::run_composer_update(&base_dirs, terminal, opt.dry_run),
+        &mut terminal,
+    ));
     report.push_result(execute(
         |terminal| node::yarn_global_update(terminal, opt.dry_run),
         &mut terminal,