diff --git a/docker-compose.yml b/docker-compose.yml
index 84ff8a5..f5bca71 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4,7 +4,7 @@ services:
     build:
       context: .
       args:
-        - UPSTREAM_VERSION=2026.09.0
+        UPSTREAM_VERSION: "2026.09.0"
     image: pi-hole.dnp.dappnode.eth:0.1.0
     ports:
       - 54:53/tcp