reverted:
--- b/core/includes/update.inc
+++ a/core/includes/update.inc
@@ -345,10 +345,9 @@
 function update_fix_d8_requirements() {
   global $conf;
 
+  if (drupal_get_installed_schema_version('system') < 8000 && !variable_get('update_d8_requirements', FALSE)) {
-  $update_config = config('update.settings');
-  if (drupal_get_installed_schema_version('system') < 8000 && !$update_config->get('d8_requirements')) {
     // @todo: Make critical, first-run changes to the database here.
+    variable_set('update_d8_requirements', TRUE);
-    $update_config->get('d8_requirements', TRUE)->save();
   }
 }
 
diff -u b/core/modules/system/tests/modules/update_script_test/config/update_script_test.settings.yml b/core/modules/system/tests/modules/update_script_test/config/update_script_test.settings.yml
--- b/core/modules/system/tests/modules/update_script_test/config/update_script_test.settings.yml
+++ b/core/modules/system/tests/modules/update_script_test/config/update_script_test.settings.yml
@@ -1 +1 @@
-requirement_type: '0'
\ No newline at end of file
+requirement_type: '0'
diff -u b/core/modules/update/config/update.settings.yml b/core/modules/update/config/update.settings.yml
--- b/core/modules/update/config/update.settings.yml
+++ b/core/modules/update/config/update.settings.yml
@@ -1,8 +1,6 @@
-advanced_project_settings: {}
 check:
     disabled_extensions: '0'
     interval_days: '1'
-d8_requirements: '0'
 fetch:
     url: ''
     max_attempts: '2'
diff -u b/core/modules/update/tests/modules/update_test/config/update_test.settings.yml b/core/modules/update/tests/modules/update_test/config/update_test.settings.yml
--- b/core/modules/update/tests/modules/update_test/config/update_test.settings.yml
+++ b/core/modules/update/tests/modules/update_test/config/update_test.settings.yml
@@ -3 +3 @@
-xml_map: '0'
\ No newline at end of file
+xml_map: '0'