diff --git a/core/modules/update/config/schema/update.schema.yml b/core/modules/update/config/schema/update.schema.yml
index 06eeb49c367..9344316517b 100644
--- a/core/modules/update/config/schema/update.schema.yml
+++ b/core/modules/update/config/schema/update.schema.yml
@@ -3,6 +3,8 @@
 update.settings:
   type: config_object
   label: 'Update settings'
+  constraints:
+    FullyValidatable: ~
   mapping:
     check:
       type: mapping
@@ -14,6 +16,10 @@ update.settings:
         interval_days:
           type: integer
           label: 'Days since last check'
+          constraints:
+            # @see \Drupal\update\UpdateSettingsForm::buildForm()
+            # The options are daily and weekly.
+            Choice: [1, 7]
     fetch:
       type: mapping
       label: 'Fetch settings'
@@ -25,9 +31,15 @@ update.settings:
         max_attempts:
           type: integer
           label: 'Maximum attempts'
+          constraints:
+            Range:
+              min: 1
         timeout:
           type: integer
           label: 'Timeout in seconds'
+          constraints:
+            Range:
+              min: 1
     notification:
       type: mapping
       label: 'Notification settings'
@@ -41,3 +53,6 @@ update.settings:
         threshold:
           type: string
           label: 'Email notification threshold'
+          constraints:
+            # @see \Drupal\update\UpdateSettingsForm::buildForm()
+            Choice: [all, security]
diff --git a/core/modules/update/migrations/update_settings.yml b/core/modules/update/migrations/update_settings.yml
index 6525a30e33e..bd93b7033ef 100644
--- a/core/modules/update/migrations/update_settings.yml
+++ b/core/modules/update/migrations/update_settings.yml
@@ -19,6 +19,12 @@ process:
   'notification/threshold': update_notification_threshold
   'notification/emails': update_notify_emails
   'check/interval_days': update_check_frequency
+  'check/disabled_extensions':
+    plugin: default_value
+    default_value: false
+  'fetch/timeout':
+    plugin: default_value
+    default_value: 30
 destination:
   plugin: config
   config_name: update.settings
diff --git a/core/modules/update/src/UpdateSettingsForm.php b/core/modules/update/src/UpdateSettingsForm.php
index 6f4628317e8..d519831248c 100644
--- a/core/modules/update/src/UpdateSettingsForm.php
+++ b/core/modules/update/src/UpdateSettingsForm.php
@@ -36,10 +36,13 @@ class UpdateSettingsForm extends ConfigFormBase {
     $form['update_check_frequency'] = [
       '#type' => 'radios',
       '#title' => $this->t('Check for updates'),
-      '#config_target' => 'update.settings:check.interval_days',
+      '#config_target' => new ConfigTarget(
+        'update.settings',
+        'check.interval_days',
+        toConfig: fn($value) => intval($value)),
       '#options' => [
-        '1' => $this->t('Daily'),
-        '7' => $this->t('Weekly'),
+        1 => $this->t('Daily'),
+        7 => $this->t('Weekly'),
       ],
       '#description' => $this->t('Select how frequently you want to automatically check for new releases of your currently installed modules and themes.'),
     ];