diff --git a/lib/config/migration.spec.ts b/lib/config/migration.spec.ts
index 98337a7a57f2d8c3bbb84f14fbb5a0a4d8d47010..b2725bf220465b875ae9731da3ed333f148560b9 100644
--- a/lib/config/migration.spec.ts
+++ b/lib/config/migration.spec.ts
@@ -1,5 +1,4 @@
 import { PlatformId } from '../constants';
-import { getConfig } from './defaults';
 import { GlobalConfig } from './global';
 import * as configMigration from './migration';
 import type {
@@ -7,9 +6,6 @@ import type {
   RenovateConfig,
   RenovateSharedConfig,
 } from './types';
-
-const defaultConfig = getConfig();
-
 interface TestRenovateConfig extends RenovateConfig {
   node?: RenovateSharedConfig;
 }
@@ -159,11 +155,8 @@ describe('config/migration', () => {
         raiseDeprecationWarnings: false,
         enabledManagers: ['yarn'],
       } as any;
-      const parentConfig = { ...defaultConfig, semanticCommits: 'disabled' };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toMatchSnapshot();
       expect(isMigrated).toBeTrue();
       expect(migratedConfig.depTypes).toBeUndefined();
@@ -180,11 +173,8 @@ describe('config/migration', () => {
           schedule: 'after 10pm and before 7am on every weekday' as never,
         },
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toMatchSnapshot();
       expect(isMigrated).toBeTrue();
       expect(migratedConfig.major.schedule).toHaveLength(2);
@@ -199,11 +189,8 @@ describe('config/migration', () => {
       const config = {
         schedule: 'every friday' as never,
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeTrue();
       expect(migratedConfig.schedule).toBe('on friday');
     });
@@ -211,11 +198,8 @@ describe('config/migration', () => {
       const config = {
         semanticPrefix: 'fix',
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeTrue();
       expect(migratedConfig.semanticCommitScope).toBeNull();
     });
@@ -223,11 +207,8 @@ describe('config/migration', () => {
       const config = {
         schedule: 'every weekday' as never,
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeFalse();
       expect(migratedConfig.schedule).toEqual(config.schedule);
     });
@@ -235,11 +216,8 @@ describe('config/migration', () => {
       const config = {
         schedule: 'after 5:00pm on wednesday and thursday' as never,
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toMatchSnapshot();
       expect(isMigrated).toBeFalse();
       expect(migratedConfig.schedule).toEqual(config.schedule);
@@ -248,11 +226,8 @@ describe('config/migration', () => {
       const config = {
         schedule: 'after 1:00pm and before 5:00pm' as never,
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig.schedule).toEqual(config.schedule);
       expect(isMigrated).toBeFalse();
     });
@@ -265,11 +240,8 @@ describe('config/migration', () => {
           },
         ],
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeTrue();
       expect(migratedConfig).toEqual({
         packageRules: [
@@ -290,11 +262,8 @@ describe('config/migration', () => {
           },
         ],
       };
-      const parentConfig = { ...defaultConfig };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        parentConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeTrue();
       expect(migratedConfig).toMatchSnapshot();
       expect(migratedConfig.packageRules[0].minor.automerge).toBeFalse();
@@ -321,10 +290,8 @@ describe('config/migration', () => {
           ],
         },
       };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        defaultConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeTrue();
       expect(migratedConfig).toMatchSnapshot();
       expect(migratedConfig.lockFileMaintenance.packageRules).toHaveLength(1);
@@ -340,10 +307,8 @@ describe('config/migration', () => {
           automerge: 'none' as never,
         },
       };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        defaultConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toMatchSnapshot();
       expect(isMigrated).toBeTrue();
       expect(
@@ -366,10 +331,8 @@ describe('config/migration', () => {
           },
         ],
       };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        defaultConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toMatchSnapshot();
       expect(isMigrated).toBeTrue();
       expect(migratedConfig.includePaths).toHaveLength(4);
@@ -396,10 +359,8 @@ describe('config/migration', () => {
           },
         ],
       };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        defaultConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toMatchSnapshot();
       expect(isMigrated).toBeTrue();
       expect(migratedConfig.includePaths).toHaveLength(1);
@@ -424,10 +385,8 @@ describe('config/migration', () => {
         commitMessage: 'test',
         raiseDeprecationWarnings: undefined,
       };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        defaultConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(migratedConfig).toEqual({
         baseBranches: [],
         commitMessage: 'test',
@@ -581,10 +540,8 @@ describe('config/migration', () => {
           },
         ],
       };
-      const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-        config,
-        defaultConfig
-      );
+      const { isMigrated, migratedConfig } =
+        configMigration.migrateConfig(config);
       expect(isMigrated).toBeTrue();
       expect(migratedConfig).toEqual({
         packageRules: [
@@ -629,10 +586,8 @@ describe('config/migration', () => {
         },
       ],
     };
-    const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-      config,
-      defaultConfig
-    );
+    const { isMigrated, migratedConfig } =
+      configMigration.migrateConfig(config);
     expect(isMigrated).toBeTrue();
     expect(migratedConfig).toMatchSnapshot();
     expect(migratedConfig.packageRules).toHaveLength(3);
@@ -647,10 +602,8 @@ describe('config/migration', () => {
     const config: RenovateConfig = {
       extends: ['@org', '@org2/foo'],
     } as any;
-    const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-      config,
-      defaultConfig
-    );
+    const { isMigrated, migratedConfig } =
+      configMigration.migrateConfig(config);
     expect(isMigrated).toBeTrue();
     expect(migratedConfig).toEqual({ extends: ['local>org/renovate-config'] });
   });
@@ -672,10 +625,8 @@ describe('config/migration', () => {
         } as any,
       ],
     };
-    const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-      config,
-      defaultConfig
-    );
+    const { isMigrated, migratedConfig } =
+      configMigration.migrateConfig(config);
     expect(isMigrated).toBeTrue();
     expect(migratedConfig).toMatchSnapshot();
   });
@@ -696,10 +647,8 @@ describe('config/migration', () => {
         },
       ],
     };
-    const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-      config,
-      defaultConfig
-    );
+    const { isMigrated, migratedConfig } =
+      configMigration.migrateConfig(config);
     expect(isMigrated).toBeTrue();
     expect(migratedConfig).toMatchSnapshot();
   });
@@ -707,17 +656,15 @@ describe('config/migration', () => {
     const config: RenovateConfig = {
       requiredStatusChecks: [],
     };
-    const { isMigrated, migratedConfig } = configMigration.migrateConfig(
-      config,
-      defaultConfig
-    );
+    const { isMigrated, migratedConfig } =
+      configMigration.migrateConfig(config);
     expect(isMigrated).toBe(true);
     expect(migratedConfig).toMatchInlineSnapshot(`Object {}`);
   });
 
   it('migrates azureAutoComplete', () => {
     const migrate = (config: RenovateConfig): MigratedConfig =>
-      configMigration.migrateConfig(config, defaultConfig);
+      configMigration.migrateConfig(config);
 
     expect(migrate({ azureAutoComplete: true })).toEqual({
       isMigrated: true,
@@ -742,7 +689,7 @@ describe('config/migration', () => {
 
   it('migrates gitLabAutomerge', () => {
     const migrate = (config: RenovateConfig): MigratedConfig =>
-      configMigration.migrateConfig(config, defaultConfig);
+      configMigration.migrateConfig(config);
 
     expect(migrate({ gitLabAutomerge: true })).toEqual({
       isMigrated: true,
diff --git a/lib/config/migration.ts b/lib/config/migration.ts
index 52a4cdea3a0da94b67929e6fcff3e2defff40740..38b7637d1ac5b3f714c0f67de5cb523c29b87e27 100644
--- a/lib/config/migration.ts
+++ b/lib/config/migration.ts
@@ -20,11 +20,7 @@ export function fixShortHours(input: string): string {
 
 let optionTypes: Record<string, RenovateOptions['type']>;
 // Returns a migrated config
-export function migrateConfig(
-  config: RenovateConfig,
-  // TODO: remove any type (#9611)
-  parentKey?: string | any
-): MigratedConfig {
+export function migrateConfig(config: RenovateConfig): MigratedConfig {
   try {
     if (!optionTypes) {
       optionTypes = {};
@@ -69,8 +65,7 @@ export function migrateConfig(
                 ? migratedConfig.packageRules
                 : [];
               const payload = migrateConfig(
-                packageFile as RenovateConfig,
-                key
+                packageFile as RenovateConfig
               ).migratedConfig;
               for (const subrule of payload.packageRules || []) {
                 subrule.paths = [(packageFile as any).packageFile];
@@ -96,8 +91,7 @@ export function migrateConfig(
           ? migratedConfig.packageRules
           : [];
         const depTypePackageRule = migrateConfig(
-          val as RenovateConfig,
-          key
+          val as RenovateConfig
         ).migratedConfig;
         depTypePackageRule.depTypeList = [key];
         delete depTypePackageRule.packageRules;
@@ -144,8 +138,7 @@ export function migrateConfig(
                 ? migratedConfig.packageRules
                 : [];
               const newPackageRule = migrateConfig(
-                depType as RenovateConfig,
-                key
+                depType as RenovateConfig
               ).migratedConfig;
               delete newPackageRule.depType;
               newPackageRule.depTypeList = [depTypeName];
@@ -173,7 +166,7 @@ export function migrateConfig(
         migratedConfig.travis = migratedConfig.travis || {};
         migratedConfig.travis.enabled = true;
         if (Object.keys(migratedConfig.node).length) {
-          const subMigrate = migrateConfig(migratedConfig.node, key);
+          const subMigrate = migrateConfig(migratedConfig.node);
           migratedConfig.node = subMigrate.migratedConfig;
         } else {
           delete migratedConfig.node;
@@ -183,7 +176,7 @@ export function migrateConfig(
           const newArray = [];
           for (const item of migratedConfig[key] as unknown[]) {
             if (is.object(item) && !is.array(item)) {
-              const arrMigrate = migrateConfig(item as RenovateConfig, key);
+              const arrMigrate = migrateConfig(item as RenovateConfig);
               newArray.push(arrMigrate.migratedConfig);
             } else {
               newArray.push(item);
@@ -192,10 +185,7 @@ export function migrateConfig(
           migratedConfig[key] = newArray;
         }
       } else if (is.object(val)) {
-        const subMigrate = migrateConfig(
-          migratedConfig[key] as RenovateConfig,
-          key
-        );
+        const subMigrate = migrateConfig(migratedConfig[key] as RenovateConfig);
         if (subMigrate.isMigrated) {
           migratedConfig[key] = subMigrate.migratedConfig;
         }