diff --git a/.editorconfig b/.editorconfig
index 3dfb23c7..91e325d6 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -14,5 +14,8 @@ trim_trailing_whitespace = true
 indent_size = 2
 indent_style = space
 
+[composer.json]
+indent_size = 4
+
 # The indent size used in the package.json file cannot be changed:
 # https://github.com/npm/npm/pull/3180#issuecomment-16336516