diff --git a/Makefile b/Makefile
index 4eb9eca..472d128 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 castblock-php.phar: box.phar
+    # Composer must be installed globally for box to work.
 	composer install --no-dev
 	php box.phar compile
 
 box.phar:
-	curl -Ls https://github.com/box-project/box/releases/download/3.11.1/box.phar -o box.phar
\ No newline at end of file
+	curl -Ls https://github.com/box-project/box/releases/download/3.13.0/box.phar -o box.phar
\ No newline at end of file