diff --git a/roles/docker_services/defaults/main.yml b/roles/docker_services/defaults/main.yml
index 213773d..d096ce9 100644
--- a/roles/docker_services/defaults/main.yml
+++ b/roles/docker_services/defaults/main.yml
@@ -54,4 +54,4 @@ services:
     version: latest
 
   watchtower:
-    version: amd64-1.5.3
+    version: '1.5.3'