diff --git a/lib/datasource/docker.js b/lib/datasource/docker.js
index 3ea57311d792e5d49e164e0fe4be2cded181bba1..f75338b1ff54453d38523575d26f3e695b8efab1 100644
--- a/lib/datasource/docker.js
+++ b/lib/datasource/docker.js
@@ -112,7 +112,8 @@ async function getDigest(config, newValue) {
     newTag += `-${tagSuffix}`;
   }
   try {
-    const url = `${massagedRegistry}/v2/${repository}/manifests/${newTag}`;
+    const url = `${massagedRegistry}/v2/${repository}/manifests/${newTag ||
+      'latest'}`;
     const cacheNamespace = 'datasource-docker-digest';
     const cachedResult = await renovateCache.get(cacheNamespace, url);
     if (cachedResult) {