diff --git a/extensions/markdown/.gitignore b/extensions/markdown/.gitignore
index 6b23a29cd..8a367ef52 100644
--- a/extensions/markdown/.gitignore
+++ b/extensions/markdown/.gitignore
@@ -4,6 +4,7 @@ composer.phar
 Thumbs.db
 bower_components
 node_modules
+composer.lock
 
 # Yarn 2+
 js/.pnp.*