diff --git a/default.json b/default.json
index b5b4a90..6f8aef5 100644
--- a/default.json
+++ b/default.json
@@ -51,13 +51,15 @@
   "customManagers": [
     {
       "customType": "regex",
-      "fileMatch": ["docker-compose.yml"],
+      "description": "Handle Docker images with optional digest (e.g. :tag or :tag@sha256:...)",
+      "fileMatch": ["(^|/)docker-compose.*\\.ya?ml$"],
       "matchStrings": [
-        "image: (?<depName>[^:]+):(?<currentValue>latest)"
+        "image:\\s*(?<depName>[\\w./-]+):(?<currentTag>[\\w.-]+)(?:@(?<currentDigest>sha256:[a-f0-9]{64}))?"
       ],
       "datasourceTemplate": "docker",
       "versioningTemplate": "docker",
-      "currentValueTemplate": "latest"
+      "extractVersionTemplate": "{{currentTag}}",
+      "extractDigestTemplate": "{{#if currentDigest}}{{currentDigest}}{{/if}}"
     }
   ],
   "packageRules": [