diff --git a/lib/modules/datasource/maven/index.ts b/lib/modules/datasource/maven/index.ts
index 7e9f3e5faf74a8..b0b22d9336f680 100644
--- a/lib/modules/datasource/maven/index.ts
+++ b/lib/modules/datasource/maven/index.ts
@@ -3,6 +3,7 @@ import { DateTime } from 'luxon';
 import type { XmlDocument } from 'xmldoc';
 import { logger } from '../../../logger';
 import * as packageCache from '../../../util/cache/package';
+import { filterMap } from '../../../util/filter-map';
 import * as p from '../../../util/promises';
 import { newlineRegex, regEx } from '../../../util/regex';
 import { ensureTrailingSlash } from '../../../util/url';
@@ -220,11 +221,14 @@ export class MavenDatasource extends Datasource {
     //
     // Even if new version is being released each 10 minutes,
     // we still want to reset the whole cache after 24 hours.
-    const isCacheValid = await packageCache.get<true>(cacheTimeoutNs, cacheKey);
+    const cacheValid = await packageCache.get<'valid'>(
+      cacheTimeoutNs,
+      cacheKey,
+    );
 
     let cachedReleaseMap: ReleaseMap = {};
     // istanbul ignore if
-    if (isCacheValid) {
+    if (cacheValid) {
       const cache = await packageCache.get<ReleaseMap>(cacheNs, cacheKey);
       if (cache) {
         cachedReleaseMap = cache;
@@ -232,8 +236,9 @@ export class MavenDatasource extends Datasource {
     }
 
     // List versions to check with HEAD request
-    const freshVersions = Object.entries(releaseMap)
-      .filter(([version, release]) => {
+    const freshVersions = filterMap(
+      Object.entries(releaseMap),
+      ([version, release]) => {
         // Release is present in maven-metadata.xml,
         // but haven't been validated yet
         const isValidatedAtPreviousSteps = release !== null;
@@ -241,10 +246,15 @@ export class MavenDatasource extends Datasource {
         // Release was validated and cached with HEAD request during previous run
         const isValidatedHere = !is.undefined(cachedReleaseMap[version]);
 
+        // istanbul ignore if: not easily testable
+        if (isValidatedAtPreviousSteps || isValidatedHere) {
+          return null;
+        }
+
         // Select only valid releases not yet verified with HEAD request
-        return !isValidatedAtPreviousSteps && !isValidatedHere;
-      })
-      .map(([k]) => k);
+        return version;
+      },
+    );
 
     // Update cached data with freshly discovered versions
     if (freshVersions.length) {
@@ -270,9 +280,9 @@ export class MavenDatasource extends Datasource {
 
       await p.all(queue);
 
-      if (!isCacheValid) {
+      if (!cacheValid) {
         // Store new TTL flag for 24 hours if the previous one is invalidated
-        await packageCache.set(cacheTimeoutNs, cacheKey, 'long', 24 * 60);
+        await packageCache.set(cacheTimeoutNs, cacheKey, 'valid', 24 * 60);
       }
 
       // Store updated cache object