diff --git a/.gitignore b/.gitignore
index 5f51990..a94fad9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ todo
 .sass-cache
 .idea
 .vscode/settings.json
+.idea/workspace.xml
+.DS_Store
\ No newline at end of file
diff --git a/.idea/Silverstripe-SEO.iml b/.idea/Silverstripe-SEO.iml
deleted file mode 100644
index c9fabd8..0000000
--- a/.idea/Silverstripe-SEO.iml
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="WEB_MODULE" version="4">
-  <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="false" packagePrefix="CyberDuck\SEO\Tests\" />
-      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" packagePrefix="CyberDuck\SEO\" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 28a804d..0000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="JavaScriptSettings">
-    <option name="languageLevel" value="ES6" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index e1e1c0b..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/Silverstripe-SEO.iml" filepath="$PROJECT_DIR$/.idea/Silverstripe-SEO.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 94a25f7..0000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 7fb5018..ee7f144 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,222 +1,31 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
   <component name="ChangeListManager">
-    <list default="true" id="e29db582-1b85-45de-87f5-2035138322bc" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/src/Model/Extension/SeoPageControllerExtension.php" beforeDir="false" afterPath="$PROJECT_DIR$/src/Model/Extension/SeoPageControllerExtension.php" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/Model/Extension/SeoPageExtension.php" beforeDir="false" afterPath="$PROJECT_DIR$/src/Model/Extension/SeoPageExtension.php" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/templates/HeadTags.ss" beforeDir="false" afterPath="$PROJECT_DIR$/templates/HeadTags.ss" afterDir="false" />
+    <list default="true" id="a0257948-ef65-4bbb-a406-536b363581cd" name="Changes" comment="">
+      <change beforePath="$PROJECT_DIR$/.gitignore" beforeDir="false" afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/Silverstripe-SEO.iml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/modules.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/vcs.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" />
     </list>
-    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
-  <component name="ComposerSettings" synchronizationState="SYNCHRONIZE">
-    <pharConfigPath>$PROJECT_DIR$/composer.json</pharConfigPath>
-    <execution>
-      <executable />
-    </execution>
-  </component>
-  <component name="FileEditorManager">
-    <leaf>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/templates/HeadTags.ss">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="257">
-              <caret line="23" column="34" lean-forward="true" selection-start-line="23" selection-start-column="34" selection-end-line="23" selection-end-column="34" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/Model/Extension/SeoPageControllerExtension.php">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="1070">
-              <caret line="67" column="43" selection-start-line="67" selection-start-column="43" selection-end-line="67" selection-end-column="43" />
-              <folding>
-                <element signature="e#49#58#0#PHP" expanded="true" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/src/Model/Extension/SeoPageExtension.php">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="252">
-              <caret line="747" lean-forward="true" selection-start-line="747" selection-end-line="747" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-    </leaf>
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-  </component>
-  <component name="IdeDocumentHistory">
-    <option name="CHANGED_PATHS">
-      <list>
-        <option value="$PROJECT_DIR$/templates/HeadTags.ss" />
-        <option value="$PROJECT_DIR$/src/Model/Extension/SeoPageControllerExtension.php" />
-        <option value="$PROJECT_DIR$/src/Model/Extension/SeoPageExtension.php" />
-      </list>
-    </option>
-  </component>
-  <component name="ProjectConfigurationFiles">
-    <option name="files">
-      <list>
-        <option value="$PROJECT_DIR$/.idea/Silverstripe-SEO.iml" />
-        <option value="$PROJECT_DIR$/.idea/misc.xml" />
-        <option value="$PROJECT_DIR$/.idea/modules.xml" />
-        <option value="$PROJECT_DIR$/.idea/vcs.xml" />
-      </list>
-    </option>
-  </component>
-  <component name="ProjectFrameBounds" extendedState="6" fullScreen="true">
-    <option name="x" value="-1805" />
-    <option name="y" value="23" />
-    <option name="width" value="1680" />
-    <option name="height" value="981" />
-  </component>
-  <component name="ProjectView">
-    <navigator proportions="" version="1">
-      <foldersAlwaysOnTop value="true" />
-    </navigator>
-    <panes>
-      <pane id="ProjectPane">
-        <subPane>
-          <expand>
-            <path>
-              <item name="Silverstripe-SEO" type="b2602c69:ProjectViewProjectNode" />
-              <item name="Silverstripe-SEO" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="Silverstripe-SEO" type="b2602c69:ProjectViewProjectNode" />
-              <item name="Silverstripe-SEO" type="462c0819:PsiDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="Silverstripe-SEO" type="b2602c69:ProjectViewProjectNode" />
-              <item name="Silverstripe-SEO" type="462c0819:PsiDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="Controller" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="Silverstripe-SEO" type="b2602c69:ProjectViewProjectNode" />
-              <item name="Silverstripe-SEO" type="462c0819:PsiDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="Model" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="Silverstripe-SEO" type="b2602c69:ProjectViewProjectNode" />
-              <item name="Silverstripe-SEO" type="462c0819:PsiDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="Model" type="462c0819:PsiDirectoryNode" />
-              <item name="Extension" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="Silverstripe-SEO" type="b2602c69:ProjectViewProjectNode" />
-              <item name="Silverstripe-SEO" type="462c0819:PsiDirectoryNode" />
-              <item name="templates" type="462c0819:PsiDirectoryNode" />
-            </path>
-          </expand>
-          <select />
-        </subPane>
-      </pane>
-      <pane id="Scope" />
-    </panes>
-  </component>
-  <component name="PropertiesComponent">
-    <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
-    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
-  </component>
-  <component name="RunDashboard">
-    <option name="ruleStates">
-      <list>
-        <RuleState>
-          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
-        </RuleState>
-        <RuleState>
-          <option name="name" value="StatusDashboardGroupingRule" />
-        </RuleState>
-      </list>
-    </option>
-  </component>
-  <component name="SvnConfiguration">
-    <configuration />
+  <component name="ComposerSettings">
+    <execution />
   </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "git-widget-placeholder": "dev-cms5"
+  }
+}]]></component>
   <component name="TaskManager">
-    <task active="true" id="Default" summary="Default task">
-      <changelist id="e29db582-1b85-45de-87f5-2035138322bc" name="Default Changelist" comment="" />
-      <created>1585949887526</created>
-      <option name="number" value="Default" />
-      <option name="presentableId" value="Default" />
-      <updated>1585949887526</updated>
-      <workItem from="1585949888891" duration="454000" />
-    </task>
     <servers />
   </component>
-  <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="454000" />
-  </component>
-  <component name="ToolWindowManager">
-    <frame x="-1920" y="0" width="1920" height="1080" extended-state="0" />
-    <editor active="true" />
-    <layout>
-      <window_info id="Favorites" side_tool="true" />
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24973376" />
-      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
-      <window_info anchor="bottom" id="Docker" show_stripe_button="false" />
-      <window_info anchor="bottom" id="Database Changes" />
-      <window_info anchor="bottom" id="Version Control" />
-      <window_info anchor="bottom" id="RNConsole" />
-      <window_info anchor="bottom" id="GraphQL" />
-      <window_info anchor="bottom" id="Terminal" visible="true" weight="0.32970297" />
-      <window_info anchor="bottom" id="Event Log" side_tool="true" />
-      <window_info anchor="bottom" id="Message" order="0" />
-      <window_info anchor="bottom" id="Find" order="1" />
-      <window_info anchor="bottom" id="Run" order="2" />
-      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
-      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
-      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
-      <window_info anchor="bottom" id="TODO" order="6" />
-      <window_info anchor="right" id="Database" />
-      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
-      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
-      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
-    </layout>
-  </component>
-  <component name="TypeScriptGeneratedFilesManager">
-    <option name="version" value="1" />
-  </component>
-  <component name="editorHistoryManager">
-    <entry file="file://$PROJECT_DIR$/templates/HeadTags.ss">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="257">
-          <caret line="23" column="34" lean-forward="true" selection-start-line="23" selection-start-column="34" selection-end-line="23" selection-end-column="34" />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/Model/Extension/SeoPageControllerExtension.php">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1070">
-          <caret line="67" column="43" selection-start-line="67" selection-start-column="43" selection-end-line="67" selection-end-column="43" />
-          <folding>
-            <element signature="e#49#58#0#PHP" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/src/Model/Extension/SeoPageExtension.php">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="252">
-          <caret line="747" lean-forward="true" selection-start-line="747" selection-end-line="747" />
-        </state>
-      </provider>
-    </entry>
-  </component>
 </project>
\ No newline at end of file
diff --git a/composer.json b/composer.json
index bb8f0d4..1100828 100644
--- a/composer.json
+++ b/composer.json
@@ -26,9 +26,9 @@
         "issues": "http://github.com/cyber-duck/silverstripe-seo/issues"
     },
     "require": {
-        "php": ">=5.6",
-        "silverstripe/cms": "^4.0",
-        "silverstripe/framework": "^4.0"
+        "php": ">=5.6 || 8.1",
+        "silverstripe/cms": ">=4.0",
+        "silverstripe/framework": ">=4.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Model/Extension/SeoPageExtension.php b/src/Model/Extension/SeoPageExtension.php
index cca598d..cddc303 100644
--- a/src/Model/Extension/SeoPageExtension.php
+++ b/src/Model/Extension/SeoPageExtension.php
@@ -267,10 +267,10 @@ public function updateCMSFields(FieldList $fields)
     public function updateSummaryFields(&$fields)
     {
         if(Controller::curr() instanceof SEOAdmin) {
-            if($this->owner->class && method_exists($this->owner->class, 'remove')) Config::inst()->remove($this->owner->class, 'summary_fields');
-            Config::modify()->set($this->owner->class, 'summary_fields', $this->getSummaryFields());
+            if($this->owner->ClassName && method_exists($this->owner->ClassName, 'remove')) Config::inst()->remove($this->owner->ClassName, 'summary_fields');
+            Config::modify()->set($this->owner->ClassName, 'summary_fields', $this->getSummaryFields());
 
-            $fields = Config::inst()->get($this->owner->class, 'summary_fields');
+            $fields = Config::inst()->get($this->owner->ClassName, 'summary_fields');
         }
     }