diff --git a/dist/index.js b/dist/index.js
index 43cd6a945..c6519e1af 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -133767,6 +133767,7 @@ const Joi = __nccwpck_require__(44010)
 const { SORT_BY, SORT_DIRECTIONS } = __nccwpck_require__(11940)
 const { DEFAULT_CONFIG } = __nccwpck_require__(85869)
 const { validateReplacers, validateAutolabeler } = __nccwpck_require__(47282)
+const merge = __nccwpck_require__(56323)
 
 const schema = (context) => {
   const defaultBranch = _.get(
@@ -133906,7 +133907,8 @@ const schema = (context) => {
 }
 
 const validateSchema = (context, repoConfig) => {
-  const { error, value: config } = schema(context).validate(repoConfig, {
+  const mergedRepoConfig = merge.all([DEFAULT_CONFIG, repoConfig])
+  const { error, value: config } = schema(context).validate(mergedRepoConfig, {
     abortEarly: false,
     allowUnknown: true,
   })
diff --git a/lib/schema.js b/lib/schema.js
index ae02f2da2..1c80cac2c 100644
--- a/lib/schema.js
+++ b/lib/schema.js
@@ -3,6 +3,7 @@ const Joi = require('@hapi/joi')
 const { SORT_BY, SORT_DIRECTIONS } = require('./sort-pull-requests')
 const { DEFAULT_CONFIG } = require('./default-config')
 const { validateReplacers, validateAutolabeler } = require('./template')
+const merge = require('deepmerge')
 
 const schema = (context) => {
   const defaultBranch = _.get(
@@ -142,7 +143,8 @@ const schema = (context) => {
 }
 
 const validateSchema = (context, repoConfig) => {
-  const { error, value: config } = schema(context).validate(repoConfig, {
+  const mergedRepoConfig = merge.all([DEFAULT_CONFIG, repoConfig])
+  const { error, value: config } = schema(context).validate(mergedRepoConfig, {
     abortEarly: false,
     allowUnknown: true,
   })
diff --git a/package.json b/package.json
index 16f22ed83..b7c8f6ee2 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "@probot/adapter-github-actions": "3.1.0",
     "cli-table3": "0.6.1",
     "compare-versions": "4.1.3",
+    "deepmerge": "4.2.2",
     "escape-string-regexp": "4.0.0",
     "ignore": "5.2.0",
     "lodash": "4.17.21",
diff --git a/test/fixtures/config/config-with-custom-version-resolver-partial.yml b/test/fixtures/config/config-with-custom-version-resolver-partial.yml
new file mode 100644
index 000000000..9394819d6
--- /dev/null
+++ b/test/fixtures/config/config-with-custom-version-resolver-partial.yml
@@ -0,0 +1,22 @@
+name-template: 'v$RESOLVED_VERSION'
+tag-template: 'v$RESOLVED_VERSION'
+branches:
+  - master
+categories:
+  - title: '🚀 Features'
+    label: 'feature'
+  - title: '🐛 Bug fixes'
+    label: 'bug'
+  - title: '📄 Documentation'
+    label: 'documentation'
+  - title: '🧰 Maintenance'
+    label: 'maintenance'
+change-template: '- $TITLE @$AUTHOR (#$NUMBER)'
+template: dummy
+version-resolver:
+  major:
+    labels:
+      - 'major'
+  default: minor
+exclude-labels:
+  - skip-changelog
diff --git a/test/index.test.js b/test/index.test.js
index 8c1c96892..f7044d500 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -2567,6 +2567,48 @@ describe('release-drafter', () => {
 
         expect.assertions(1)
       })
+
+      it('major beats others partial config', async () => {
+        getConfigMock('config-with-custom-version-resolver-partial.yml')
+
+        nock('https://api.github.com')
+          .get(
+            '/repos/toolmantim/release-drafter-test-project/releases?per_page=100'
+          )
+          .reply(200, [releasePayload])
+
+        nock('https://api.github.com')
+          .post('/graphql', (body) =>
+            body.query.includes('query findCommitsWithAssociatedPullRequests')
+          )
+          .reply(200, graphqlCommitsForking)
+
+        nock('https://api.github.com')
+          .post(
+            '/repos/toolmantim/release-drafter-test-project/releases',
+            (body) => {
+              expect(body).toMatchInlineSnapshot(`
+                Object {
+                  "body": "dummy",
+                  "draft": true,
+                  "name": "v3.0.0",
+                  "prerelease": false,
+                  "tag_name": "v3.0.0",
+                  "target_commitish": "",
+                }
+              `)
+              return true
+            }
+          )
+          .reply(200, releasePayload)
+
+        await probot.receive({
+          name: 'push',
+          payload: pushPayload,
+        })
+
+        expect.assertions(1)
+      })
     })
 
     describe('with commitish', () => {
diff --git a/yarn.lock b/yarn.lock
index abdff74c8..85fb62530 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2195,7 +2195,7 @@ deep-is@^0.1.3, deep-is@~0.1.3:
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
   integrity sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=
 
-deepmerge@^4.2.2:
+deepmerge@4.2.2, deepmerge@^4.2.2:
   version "4.2.2"
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.2.2.tgz#44d2ea3679b8f4d4ffba33f03d865fc1e7bf4955"
   integrity sha512-FJ3UgI4gIl+PHZm53knsuSFpE+nESMr7M4v9QcgB7S63Kj/6WqMiFQJpBBYz1Pt+66bZpP3Q7Lye0Oo9MPKEdg==