diff --git a/.changeset/quick-suns-swim.md b/.changeset/quick-suns-swim.md
new file mode 100644
index 0000000000..6113253e22
--- /dev/null
+++ b/.changeset/quick-suns-swim.md
@@ -0,0 +1,5 @@
+---
+'@backstage/backend-defaults': patch
+---
+
+Accept `ConfigService` instead of `Config` in constructors/factories
diff --git a/packages/backend-defaults/api-report-cache.md b/packages/backend-defaults/api-report-cache.md
index 58106430ab..f5ea85ad24 100644
--- a/packages/backend-defaults/api-report-cache.md
+++ b/packages/backend-defaults/api-report-cache.md
@@ -5,15 +5,15 @@
 ```ts
 import { CacheService } from '@backstage/backend-plugin-api';
 import { CacheServiceOptions } from '@backstage/backend-plugin-api';
-import { Config } from '@backstage/config';
 import { LoggerService } from '@backstage/backend-plugin-api';
+import { RootConfigService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
 
 // @public
 export class CacheManager {
   forPlugin(pluginId: string): PluginCacheManager;
   static fromConfig(
-    config: Config,
+    config: RootConfigService,
     options?: CacheManagerOptions,
   ): CacheManager;
 }
diff --git a/packages/backend-defaults/api-report-database.md b/packages/backend-defaults/api-report-database.md
index 10de8df1ff..49ffa75ca7 100644
--- a/packages/backend-defaults/api-report-database.md
+++ b/packages/backend-defaults/api-report-database.md
@@ -8,6 +8,7 @@ import { DatabaseService } from '@backstage/backend-plugin-api';
 import { LifecycleService } from '@backstage/backend-plugin-api';
 import { LoggerService } from '@backstage/backend-plugin-api';
 import { PluginMetadataService } from '@backstage/backend-plugin-api';
+import { RootConfigService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
 
 // @public
@@ -20,7 +21,7 @@ export class DatabaseManager implements LegacyRootDatabaseService {
     },
   ): DatabaseService;
   static fromConfig(
-    config: Config,
+    config: RootConfigService,
     options?: DatabaseManagerOptions,
   ): DatabaseManager;
 }
diff --git a/packages/backend-defaults/api-report-discovery.md b/packages/backend-defaults/api-report-discovery.md
index de60256f02..f12daf49c1 100644
--- a/packages/backend-defaults/api-report-discovery.md
+++ b/packages/backend-defaults/api-report-discovery.md
@@ -3,8 +3,8 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
-import { Config } from '@backstage/config';
 import { DiscoveryService } from '@backstage/backend-plugin-api';
+import { RootConfigService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
 
 // @public
@@ -17,7 +17,7 @@ export const discoveryServiceFactory: ServiceFactory<
 // @public
 export class HostDiscovery implements DiscoveryService {
   static fromConfig(
-    config: Config,
+    config: RootConfigService,
     options?: {
       basePath?: string;
     },
diff --git a/packages/backend-defaults/api-report-urlReader.md b/packages/backend-defaults/api-report-urlReader.md
index 73fbcd60ac..f8b8db2954 100644
--- a/packages/backend-defaults/api-report-urlReader.md
+++ b/packages/backend-defaults/api-report-urlReader.md
@@ -12,7 +12,6 @@ import { AzureIntegration } from '@backstage/integration';
 import { BitbucketCloudIntegration } from '@backstage/integration';
 import { BitbucketIntegration } from '@backstage/integration';
 import { BitbucketServerIntegration } from '@backstage/integration';
-import { Config } from '@backstage/config';
 import { GerritIntegration } from '@backstage/integration';
 import { GiteaIntegration } from '@backstage/integration';
 import { GithubCredentialsProvider } from '@backstage/integration';
@@ -21,6 +20,7 @@ import { GitLabIntegration } from '@backstage/integration';
 import { HarnessIntegration } from '@backstage/integration';
 import { LoggerService } from '@backstage/backend-plugin-api';
 import { Readable } from 'stream';
+import { RootConfigService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
 import { ServiceRef } from '@backstage/backend-plugin-api';
 import { UrlReaderService } from '@backstage/backend-plugin-api';
@@ -360,7 +360,7 @@ export class HarnessUrlReader implements UrlReaderService {
 
 // @public
 export type ReaderFactory = (options: {
-  config: Config;
+  config: RootConfigService;
   logger: LoggerService;
   treeResponseFactory: ReadTreeResponseFactory;
 }) => UrlReaderPredicateTuple[];
@@ -442,7 +442,7 @@ export const urlReaderServiceFactory: ServiceFactory<
 
 // @public
 export type UrlReadersOptions = {
-  config: Config;
+  config: RootConfigService;
   logger: LoggerService;
   factories?: ReaderFactory[];
 };
diff --git a/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts b/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts
index 9dd42862c9..fa4487a50f 100644
--- a/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts
+++ b/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts
@@ -17,8 +17,8 @@
 import {
   CacheServiceOptions,
   LoggerService,
+  RootConfigService,
 } from '@backstage/backend-plugin-api';
-import { Config } from '@backstage/config';
 import Keyv from 'keyv';
 import { DefaultCacheClient } from './CacheClient';
 import {
@@ -62,7 +62,7 @@ export class CacheManager {
    * @param config - The loaded application configuration.
    */
   static fromConfig(
-    config: Config,
+    config: RootConfigService,
     options: CacheManagerOptions = {},
   ): CacheManager {
     // If no `backend.cache` config is provided, instantiate the CacheManager
diff --git a/packages/backend-defaults/src/entrypoints/database/DatabaseManager.ts b/packages/backend-defaults/src/entrypoints/database/DatabaseManager.ts
index b3e69f0ae2..88d95443bb 100644
--- a/packages/backend-defaults/src/entrypoints/database/DatabaseManager.ts
+++ b/packages/backend-defaults/src/entrypoints/database/DatabaseManager.ts
@@ -19,6 +19,7 @@ import {
   LifecycleService,
   LoggerService,
   PluginMetadataService,
+  RootConfigService,
 } from '@backstage/backend-plugin-api';
 import { Config } from '@backstage/config';
 import { stringifyError } from '@backstage/errors';
@@ -200,7 +201,7 @@ export class DatabaseManager implements LegacyRootDatabaseService {
    * @param options - An optional configuration object.
    */
   static fromConfig(
-    config: Config,
+    config: RootConfigService,
     options?: DatabaseManagerOptions,
   ): DatabaseManager {
     const databaseConfig = config.getConfig('backend.database');
diff --git a/packages/backend-defaults/src/entrypoints/discovery/HostDiscovery.ts b/packages/backend-defaults/src/entrypoints/discovery/HostDiscovery.ts
index 559dda2aa0..26e2a01a23 100644
--- a/packages/backend-defaults/src/entrypoints/discovery/HostDiscovery.ts
+++ b/packages/backend-defaults/src/entrypoints/discovery/HostDiscovery.ts
@@ -15,7 +15,10 @@
  */
 
 import { Config } from '@backstage/config';
-import { DiscoveryService } from '@backstage/backend-plugin-api';
+import {
+  DiscoveryService,
+  RootConfigService,
+} from '@backstage/backend-plugin-api';
 import { readHttpServerOptions } from '../rootHttpRouter/http/config';
 
 type Target = string | { internal: string; external: string };
@@ -55,7 +58,10 @@ export class HostDiscovery implements DiscoveryService {
    * The basePath defaults to `/api`, meaning the default full internal
    * path for the `catalog` plugin will be `http://localhost:7007/api/catalog`.
    */
-  static fromConfig(config: Config, options?: { basePath?: string }) {
+  static fromConfig(
+    config: RootConfigService,
+    options?: { basePath?: string },
+  ) {
     const basePath = options?.basePath ?? '/api';
     const externalBaseUrl = config
       .getString('backend.baseUrl')
diff --git a/packages/backend-defaults/src/entrypoints/urlReader/lib/UrlReaders.ts b/packages/backend-defaults/src/entrypoints/urlReader/lib/UrlReaders.ts
index cb496dd702..96e9ed6509 100644
--- a/packages/backend-defaults/src/entrypoints/urlReader/lib/UrlReaders.ts
+++ b/packages/backend-defaults/src/entrypoints/urlReader/lib/UrlReaders.ts
@@ -14,8 +14,11 @@
  * limitations under the License.
  */
 
-import { LoggerService, UrlReaderService } from '@backstage/backend-plugin-api';
-import { Config } from '@backstage/config';
+import {
+  LoggerService,
+  RootConfigService,
+  UrlReaderService,
+} from '@backstage/backend-plugin-api';
 import { ReaderFactory } from './types';
 import { UrlReaderPredicateMux } from './UrlReaderPredicateMux';
 import { AzureUrlReader } from './AzureUrlReader';
@@ -40,7 +43,7 @@ import { HarnessUrlReader } from './HarnessUrlReader';
  */
 export type UrlReadersOptions = {
   /** Root config object */
-  config: Config;
+  config: RootConfigService;
   /** Logger used by all the readers */
   logger: LoggerService;
   /** A list of factories used to construct individual readers that match on URLs */
diff --git a/packages/backend-defaults/src/entrypoints/urlReader/lib/types.ts b/packages/backend-defaults/src/entrypoints/urlReader/lib/types.ts
index 510b12545f..5afbed178f 100644
--- a/packages/backend-defaults/src/entrypoints/urlReader/lib/types.ts
+++ b/packages/backend-defaults/src/entrypoints/urlReader/lib/types.ts
@@ -15,11 +15,11 @@
  */
 
 import { Readable } from 'stream';
-import { Config } from '@backstage/config';
 import {
   UrlReaderService,
   UrlReaderServiceReadTreeResponse,
   LoggerService,
+  RootConfigService,
 } from '@backstage/backend-plugin-api';
 
 /**
@@ -40,7 +40,7 @@ export type UrlReaderPredicateTuple = {
  * @public
  */
 export type ReaderFactory = (options: {
-  config: Config;
+  config: RootConfigService;
   logger: LoggerService;
   treeResponseFactory: ReadTreeResponseFactory;
 }) => UrlReaderPredicateTuple[];