diff --git a/README.md b/README.md
index 1ca941e..7be583c 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ A lightweight bridge between Forgejo Actions and shields.io.
 In `docker-compose-yaml`:
 
 ``` yaml
-version: 3
+version: "3"
 services:
     ironforge:
         image: git.madhouse-project.org/algernon/ironforge:latest