diff --git a/src/Extension/FluentChangesExtension.php b/src/Extension/FluentChangesExtension.php
index 07fc8d61..8198ff37 100644
--- a/src/Extension/FluentChangesExtension.php
+++ b/src/Extension/FluentChangesExtension.php
@@ -19,7 +19,7 @@ class FluentChangesExtension extends DataExtension
      * @param int    $draftVersion
      * @param int    $liveVersion
      */
-    public function updateChangeType(&$type, $draftVersion, $liveVersion)
+    protected function updateChangeType(&$type, $draftVersion, $liveVersion)
     {
         if ($type !== ChangeSetItem::CHANGE_NONE) {
             return;
diff --git a/src/Extension/FluentDirectorExtension.php b/src/Extension/FluentDirectorExtension.php
index 9fb27b78..ca6f8217 100644
--- a/src/Extension/FluentDirectorExtension.php
+++ b/src/Extension/FluentDirectorExtension.php
@@ -74,7 +74,7 @@ class FluentDirectorExtension extends Extension
      * @param array &$rules
      * @throws Exception
      */
-    public function updateRules(&$rules)
+    protected function updateRules(&$rules)
     {
         $request = Injector::inst()->get(HTTPRequest::class);
         if (!$request) {
diff --git a/src/Extension/FluentExtension.php b/src/Extension/FluentExtension.php
index ff4f6820..abb91eef 100644
--- a/src/Extension/FluentExtension.php
+++ b/src/Extension/FluentExtension.php
@@ -360,7 +360,7 @@ protected function anyMatch($value, $patterns)
         return false;
     }
 
-    public function augmentDatabase()
+    protected function augmentDatabase()
     {
         // Build _Localisation table
         $class = get_class($this->owner);
@@ -462,7 +462,7 @@ protected function augmentDatabaseRequireTable($localisedTable, $fields, $indexe
         DB::require_table($localisedTable, $fields, $indexes, false);
     }
 
-    public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
+    protected function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
     {
         $locale = $this->getDataQueryLocale($dataQuery);
         if (!$locale) {
@@ -728,7 +728,7 @@ static function (FluentState $state) use ($recordLocale, $localisedRecord): void
      *
      * @throws LogicException if the manipulation table's ID is missing
      */
-    public function augmentWrite(&$manipulation)
+    protected function augmentWrite(&$manipulation)
     {
         $locale = Locale::getCurrentLocale();
         if (!$locale) {
@@ -1068,7 +1068,7 @@ public function BaseURLForLocale($locale)
      *
      * @return string
      */
-    public function cacheKeyComponent()
+    protected function cacheKeyComponent()
     {
         return 'fluentlocale-' . FluentState::singleton()->getLocale();
     }
@@ -1076,7 +1076,7 @@ public function cacheKeyComponent()
     /**
      * @param FieldList $fields
      */
-    public function updateCMSFields(FieldList $fields)
+    protected function updateCMSFields(FieldList $fields)
     {
         // If there is no current FluentState, then we shouldn't update.
         if (!FluentState::singleton()->getLocale()) {
@@ -1245,7 +1245,7 @@ protected function findRecordInLocale($locale, $table, $id)
      * @param $summaryColumns
      * @see FluentObjectTrait::updateFluentCMSFields()
      */
-    public function updateLocalisationTabColumns(&$summaryColumns)
+    protected function updateLocalisationTabColumns(&$summaryColumns)
     {
         $summaryColumns['Status'] = [
             'title'    => 'Status',
@@ -1286,7 +1286,7 @@ public function updateLocalisationTabColumns(&$summaryColumns)
      *
      * @param GridFieldConfig $config
      */
-    public function updateLocalisationTabConfig(GridFieldConfig $config)
+    protected function updateLocalisationTabConfig(GridFieldConfig $config)
     {
         // Add locale copy actions
         $config->addComponents([
diff --git a/src/Extension/FluentFilteredExtension.php b/src/Extension/FluentFilteredExtension.php
index b7dac66c..79836aa0 100644
--- a/src/Extension/FluentFilteredExtension.php
+++ b/src/Extension/FluentFilteredExtension.php
@@ -38,7 +38,7 @@ class FluentFilteredExtension extends DataExtension
         'FilteredLocales' => Locale::class,
     ];
 
-    public function updateCMSFields(FieldList $fields)
+    protected function updateCMSFields(FieldList $fields)
     {
         $locales = Locale::getCached();
 
@@ -58,7 +58,7 @@ public function updateCMSFields(FieldList $fields)
      *
      * @param array $flags
      */
-    public function updateStatusFlags(&$flags)
+    protected function updateStatusFlags(&$flags)
     {
         // If there is no current FluentState, then we shouldn't update.
         if (!FluentState::singleton()->getLocale()) {
@@ -101,7 +101,7 @@ public function isAvailableInLocale($locale = null)
      * @param SQLSelect      $query
      * @param DataQuery|null $dataQuery
      */
-    public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
+    protected function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
     {
         // We don't want this logic applied in the CMS.
         if (!FluentState::singleton()->getIsFrontend()) {
@@ -170,13 +170,13 @@ protected function getModeIsStage()
         return substr_compare($readingMode, $draft, strlen($readingMode) - strlen($draft), strlen($draft)) === 0;
     }
 
-    public function updateLocalisationTabConfig(GridFieldConfig $config)
+    protected function updateLocalisationTabConfig(GridFieldConfig $config)
     {
         // Add inline toggle on/off to gridfield
         $config->addComponent(LocaleToggleColumn::create());
     }
 
-    public function updateLocalisationTabColumns(&$summaryColumns)
+    protected function updateLocalisationTabColumns(&$summaryColumns)
     {
         // no-op
     }
diff --git a/src/Extension/FluentGridFieldExtension.php b/src/Extension/FluentGridFieldExtension.php
index 2a2ca326..41fd528a 100644
--- a/src/Extension/FluentGridFieldExtension.php
+++ b/src/Extension/FluentGridFieldExtension.php
@@ -31,13 +31,13 @@ class FluentGridFieldExtension extends Extension
      * @param DBField|null $badgeField
      * @see VersionedGridFieldItemRequest::Breadcrumbs()
      */
-    public function updateBadge(&$badgeField)
+    protected function updateBadge(&$badgeField)
     {
         $record = $this->owner->getRecord();
         $badgeField = $this->addFluentBadge($badgeField, $record);
     }
 
-    public function updateFormActions(FieldList $actions)
+    protected function updateFormActions(FieldList $actions)
     {
         $this->updateFluentActions($actions, $this->owner->getRecord());
     }
diff --git a/src/Extension/FluentIsolatedExtension.php b/src/Extension/FluentIsolatedExtension.php
index b2e83dd0..af13d2ed 100644
--- a/src/Extension/FluentIsolatedExtension.php
+++ b/src/Extension/FluentIsolatedExtension.php
@@ -43,7 +43,7 @@ public function onBeforeWrite()
      * @param SQLSelect $query
      * @param DataQuery $dataQuery
      */
-    public function augmentDataQueryCreation(SQLSelect $query, DataQuery $dataQuery)
+    protected function augmentDataQueryCreation(SQLSelect $query, DataQuery $dataQuery)
     {
         $state = FluentState::singleton();
         $dataQuery
@@ -56,7 +56,7 @@ public function augmentDataQueryCreation(SQLSelect $query, DataQuery $dataQuery)
      *
      * @throws LogicException
      */
-    public function augmentDatabase()
+    protected function augmentDatabase()
     {
         // Safety check: This extension cannot be added with fluent or filtered extensions
         if ($this->owner->hasExtension(FluentFilteredExtension::class)
@@ -79,7 +79,7 @@ public function requireDefaultRecords()
      * @param SQLSelect $query
      * @param DataQuery|null $dataQuery
      */
-    public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
+    protected function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
     {
         $locale = $this->getDataQueryLocale($dataQuery);
         if (!$locale) {
diff --git a/src/Extension/FluentLeftAndMainExtension.php b/src/Extension/FluentLeftAndMainExtension.php
index 8135059d..f274df67 100644
--- a/src/Extension/FluentLeftAndMainExtension.php
+++ b/src/Extension/FluentLeftAndMainExtension.php
@@ -31,7 +31,7 @@ public function init()
      * @param ArrayList $breadcrumbs
      * @see CMSMain::Breadcrumbs()
      */
-    public function updateBreadcrumbs(ArrayList $breadcrumbs)
+    protected function updateBreadcrumbs(ArrayList $breadcrumbs)
     {
         $record = $this->owner->currentPage();
         if (!$record) {
diff --git a/src/Extension/FluentMemberExtension.php b/src/Extension/FluentMemberExtension.php
index 276b87b9..45a7b283 100644
--- a/src/Extension/FluentMemberExtension.php
+++ b/src/Extension/FluentMemberExtension.php
@@ -21,7 +21,7 @@ class FluentMemberExtension extends DataExtension
      *
      * @param Member_GroupSet $groups
      */
-    public function updateGroups(Member_GroupSet &$groups)
+    protected function updateGroups(Member_GroupSet &$groups)
     {
         // Filter groups by those that either have no locales selected (same as selected for all),
         // or groups that have the current locale selected.
diff --git a/src/Extension/FluentReadVersionsExtension.php b/src/Extension/FluentReadVersionsExtension.php
index 92a95232..13224180 100644
--- a/src/Extension/FluentReadVersionsExtension.php
+++ b/src/Extension/FluentReadVersionsExtension.php
@@ -22,7 +22,7 @@ class FluentReadVersionsExtension extends Extension
      *
      * @param DataList &$list
      */
-    public function updateList(DataList &$list)
+    protected function updateList(DataList &$list)
     {
         /** @var DataObject $singleton */
         $singleton = Injector::inst()->get($list->dataClass());
diff --git a/src/Extension/FluentSiteTreeExtension.php b/src/Extension/FluentSiteTreeExtension.php
index 0eedf5dc..355981ba 100644
--- a/src/Extension/FluentSiteTreeExtension.php
+++ b/src/Extension/FluentSiteTreeExtension.php
@@ -164,7 +164,7 @@ public function updateLink(&$link, &$action, &$relativeLink)
      *
      * @param array $flags
      */
-    public function updateStatusFlags(&$flags)
+    protected function updateStatusFlags(&$flags)
     {
         // If there is no current FluentState, then we shouldn't update.
         if (!FluentState::singleton()->getLocale()) {
@@ -187,7 +187,7 @@ public function updateStatusFlags(&$flags)
     /**
      * @param FieldList $fields
      */
-    public function updateCMSFields(FieldList $fields)
+    protected function updateCMSFields(FieldList $fields)
     {
         // If there is no current FluentState, then we shouldn't update.
         if (!FluentState::singleton()->getLocale()) {
@@ -202,7 +202,7 @@ public function updateCMSFields(FieldList $fields)
     /**
      * @param FieldList $actions
      */
-    public function updateCMSActions(FieldList $actions)
+    protected function updateCMSActions(FieldList $actions)
     {
         // If there is no current FluentState, then we shouldn't update.
         if (!FluentState::singleton()->getLocale()) {
@@ -535,7 +535,7 @@ public function actionComplete($form, $message)
      * @param $summaryColumns
      * @see FluentExtension::updateFluentCMSFields()
      */
-    public function updateLocalisationTabColumns(&$summaryColumns)
+    protected function updateLocalisationTabColumns(&$summaryColumns)
     {
         parent::updateLocalisationTabColumns($summaryColumns);
 
diff --git a/src/Extension/FluentVersionedExtension.php b/src/Extension/FluentVersionedExtension.php
index 83ddc7df..64c7c366 100644
--- a/src/Extension/FluentVersionedExtension.php
+++ b/src/Extension/FluentVersionedExtension.php
@@ -108,7 +108,7 @@ class FluentVersionedExtension extends FluentExtension implements Resettable
      */
     private static $prepopulate_localecontent_cache = true;
 
-    public function augmentDatabase()
+    protected function augmentDatabase()
     {
         // Safety check: This extension is added AFTER versioned
         $seenVersioned = false;
@@ -155,7 +155,7 @@ protected function augmentDatabaseRequireTable($localisedTable, $fields, $indexe
      *
      * @throws InvalidArgumentException if an invalid versioned mode is provided
      */
-    public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
+    protected function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
     {
         $locale = $this->getDataQueryLocale($dataQuery);
         if (!$locale) {
@@ -281,7 +281,7 @@ protected function localiseVersionsLookup(SQLSelect $query, Locale $locale)
      *
      * @param array $manipulation
      */
-    public function augmentWrite(&$manipulation)
+    protected function augmentWrite(&$manipulation)
     {
         parent::augmentWrite($manipulation);
 
@@ -527,7 +527,7 @@ public static function reset()
      * @param array          $options    A map of hints about what should be cached. "numChildrenMethod" and
      *                                   "childrenMethod" are allowed keys.
      */
-    public function onPrepopulateTreeDataCache($recordList = null, array $options = [])
+    protected function onPrepopulateTreeDataCache($recordList = null, array $options = [])
     {
         if (!Config::inst()->get(self::class, 'prepopulate_localecontent_cache')) {
             return;
@@ -586,7 +586,7 @@ public static function prepoulateIdsInLocale($locale, $dataObjectClass, $populat
         }
     }
 
-    public function updateLocalisationTabColumns(&$summaryColumns)
+    protected function updateLocalisationTabColumns(&$summaryColumns)
     {
         $summaryColumns['Status'] = [
             'title' => 'Status',
@@ -649,7 +649,7 @@ public function updateLocalisationTabColumns(&$summaryColumns)
      *
      * @param GridFieldConfig $config
      */
-    public function updateLocalisationTabConfig(GridFieldConfig $config)
+    protected function updateLocalisationTabConfig(GridFieldConfig $config)
     {
         parent::updateLocalisationTabConfig($config);
 
@@ -665,7 +665,7 @@ public function updateLocalisationTabConfig(GridFieldConfig $config)
      *
      * @param bool $stagesDiffer
      */
-    public function updateStagesDiffer(bool &$stagesDiffer): void
+    protected function updateStagesDiffer(bool &$stagesDiffer): void
     {
         $locale = FluentState::singleton()->getLocale();
 
@@ -682,7 +682,7 @@ public function updateStagesDiffer(bool &$stagesDiffer): void
      *
      * @param bool $isArchived
      */
-    public function updateIsArchived(bool &$isArchived): void
+    protected function updateIsArchived(bool &$isArchived): void
     {
         $locale = FluentState::singleton()->getLocale();
 
@@ -816,7 +816,7 @@ public function augmentMaxVersionSubSelect(
      * @param string $stage
      * @param array|null $idList
      */
-    public function updatePrePopulateVersionNumberCache(array $versions, $class, string $stage, ?array $idList): void
+    protected function updatePrePopulateVersionNumberCache(array $versions, $class, string $stage, ?array $idList): void
     {
         $locale = FluentState::singleton()->getLocale();
 
@@ -850,7 +850,7 @@ public function updatePrePopulateVersionNumberCache(array $versions, $class, str
      * @param int $id
      * @param bool $cache
      */
-    public function updateGetVersionNumberByStage(?int &$version, $class, string $stage, int $id, bool $cache): void
+    protected function updateGetVersionNumberByStage(?int &$version, $class, string $stage, int $id, bool $cache): void
     {
         $locale = FluentState::singleton()->getLocale();
 
diff --git a/src/Extension/Traits/FluentObjectTrait.php b/src/Extension/Traits/FluentObjectTrait.php
index 54076df5..45be8779 100644
--- a/src/Extension/Traits/FluentObjectTrait.php
+++ b/src/Extension/Traits/FluentObjectTrait.php
@@ -25,14 +25,14 @@ trait FluentObjectTrait
      * @param $summaryColumns
      * @see FluentObjectTrait::updateFluentCMSFields()
      */
-    abstract public function updateLocalisationTabColumns(&$summaryColumns);
+    abstract protected function updateLocalisationTabColumns(&$summaryColumns);
 
     /**
      * Add additional configs to localisation table
      *
      * @param GridFieldConfig $config
      */
-    abstract public function updateLocalisationTabConfig(
+    abstract protected function updateLocalisationTabConfig(
         GridFieldConfig $config
     );
 
@@ -70,7 +70,7 @@ public function LinkedLocales()
      * @param SQLSelect $query
      * @param DataQuery $dataQuery
      */
-    public function augmentDataQueryCreation(
+    protected function augmentDataQueryCreation(
         SQLSelect $query,
         DataQuery $dataQuery
     ) {
diff --git a/src/Model/Delete/UsesDeletePolicy.php b/src/Model/Delete/UsesDeletePolicy.php
index f403cac8..cd94f400 100644
--- a/src/Model/Delete/UsesDeletePolicy.php
+++ b/src/Model/Delete/UsesDeletePolicy.php
@@ -16,7 +16,7 @@ trait UsesDeletePolicy
      *
      * @param array $queriedTables
      */
-    public function updateDeleteTables(&$queriedTables)
+    protected function updateDeleteTables(&$queriedTables)
     {
         // Ensure a locale exists
         $locale = Locale::getCurrentLocale();
diff --git a/src/Model/Locale.php b/src/Model/Locale.php
index e97715db..d1871048 100644
--- a/src/Model/Locale.php
+++ b/src/Model/Locale.php
@@ -230,7 +230,7 @@ public function getLocaleSuffix()
      *
      * For example, you may want to display the full locale badge:
      * <code>
-     * public function updateBadgeLabel(&$badgeLabel)
+     * protected function updateBadgeLabel(&$badgeLabel)
      * {
      *     $badgeLabel = $this->owner->Locale;
      * }