diff --git a/tag-zsh/zsh/configs/functions.zsh b/tag-zsh/zsh/configs/functions.zsh
index 1a2141f..315f83a 100644
--- a/tag-zsh/zsh/configs/functions.zsh
+++ b/tag-zsh/zsh/configs/functions.zsh
@@ -15,6 +15,15 @@ function db {
 is_linux() { [[ "$(uname)" == 'Linux'  ]] }
 is_macos() { [[ "$(uname)" == "Darwin" ]] }
 
+function composer() {
+  docker run -u $UID -it --rm \
+    -v $(pwd):/app \
+    -v ~/.composer:/root/.composer \
+    -v ~/.ssh:/root/.ssh \
+    composer \
+    composer $*
+}
+
 # Run 'phpunit' or 'pest' depending on the project.
 function p () {
   vendor/bin/$(phpunit-or-pest) $*;