diff --git a/lib/datasource/docker.js b/lib/datasource/docker.js
index 391a585fe90b4c7ef43f7ce9534df8503fc08fbb..71f73f9c6a4e38ba26dbb615e7f6b955b4fe43c0 100644
--- a/lib/datasource/docker.js
+++ b/lib/datasource/docker.js
@@ -230,7 +230,7 @@ async function getTags(registry, repository) {
     } while (url && page < 20);
     logger.debug({ length: tags.length }, 'Got docker tags');
     logger.trace({ tags });
-    const cacheMinutes = 30;
+    const cacheMinutes = 15;
     await renovateCache.set(cacheNamespace, cacheKey, tags, cacheMinutes);
     return tags;
   } catch (err) /* istanbul ignore next */ {