diff --git a/packages/typo3-fractor/config/typo3-8.php b/packages/typo3-fractor/config/typo3-8.php
index 9f72cb54..bc6e484d 100644
--- a/packages/typo3-fractor/config/typo3-8.php
+++ b/packages/typo3-fractor/config/typo3-8.php
@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+use a9f\Typo3Fractor\TYPO3v8\Fluid\ReplaceCaseDefaultWithDefaultCaseFluidFractor;
 use a9f\Typo3Fractor\TYPO3v8\TypoScript\RemoveConfigPrefixLocalAnchorsFractor;
 use a9f\Typo3Fractor\TYPO3v8\TypoScript\RemoveConfigRenderCharsetFractor;
 use a9f\Typo3Fractor\TYPO3v8\TypoScript\RemoveModNewPageWizOverrideWithExtensionFractor;
@@ -13,6 +14,7 @@
         ->autoconfigure()
         ->autowire();
 
+    $services->set(ReplaceCaseDefaultWithDefaultCaseFluidFractor::class);
     $services->set(RemoveConfigPrefixLocalAnchorsFractor::class);
     $services->set(RemoveConfigRenderCharsetFractor::class);
     $services->set(RemoveModNewPageWizOverrideWithExtensionFractor::class);
diff --git a/packages/typo3-fractor/docs/typo3-fractor-rules.md b/packages/typo3-fractor/docs/typo3-fractor-rules.md
index 6754bd18..b09ad5b3 100644
--- a/packages/typo3-fractor/docs/typo3-fractor-rules.md
+++ b/packages/typo3-fractor/docs/typo3-fractor-rules.md
@@ -1,4 +1,4 @@
-# 69 Rules Overview
+# 70 Rules Overview
 
 ## AbstractMessageGetSeverityFluidFractor
 
@@ -1471,6 +1471,22 @@ Rename key mail to email for MailLinkHandler
 
 <br>
 
+## ReplaceCaseDefaultWithDefaultCaseFluidFractor
+
+Replace f:case with default attribute by f:defaultCase
+
+- class: [`a9f\Typo3Fractor\TYPO3v8\Fluid\ReplaceCaseDefaultWithDefaultCaseFluidFractor`](../rules/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor.php)
+
+```diff
+ <f:switch expression="{someVariable}">
+     <f:case value="foo">foo</f:case>
+-    <f:case default="true">bar</f:case>
++    <f:defaultCase>bar</f:defaultCase>
+ </f:switch>
+```
+
+<br>
+
 ## TranslationFileYamlFractor
 
 Use key translationFiles instead of translationFile
diff --git a/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/Fixtures/fixture.html.fixture b/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/Fixtures/fixture.html.fixture
new file mode 100644
index 00000000..6cce56f7
--- /dev/null
+++ b/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/Fixtures/fixture.html.fixture
@@ -0,0 +1,9 @@
+<f:switch expression="{someVariable}">
+    <f:case value="foo">foo</f:case>
+    <f:case default="true">bar</f:case>
+</f:switch>
+-----
+<f:switch expression="{someVariable}">
+    <f:case value="foo">foo</f:case>
+    <f:defaultCase>bar</f:defaultCase>
+</f:switch>
diff --git a/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/ReplaceCaseDefaultWithDefaultCaseFluidFractorTest.php b/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/ReplaceCaseDefaultWithDefaultCaseFluidFractorTest.php
new file mode 100644
index 00000000..f061295d
--- /dev/null
+++ b/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/ReplaceCaseDefaultWithDefaultCaseFluidFractorTest.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace a9f\Typo3Fractor\Tests\TYPO3v8\Fluid\ReplaceCaseDefaultWithDefaultCaseFluidFractor;
+
+use a9f\Fractor\Testing\PHPUnit\AbstractFractorTestCase;
+use PHPUnit\Framework\Attributes\DataProvider;
+
+final class ReplaceCaseDefaultWithDefaultCaseFluidFractorTest extends AbstractFractorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): \Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixtures', '*.html.fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/fractor.php';
+    }
+}
diff --git a/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/config/fractor.php b/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/config/fractor.php
new file mode 100644
index 00000000..26ed365a
--- /dev/null
+++ b/packages/typo3-fractor/rules-tests/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor/config/fractor.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+use a9f\Fractor\Configuration\FractorConfiguration;
+use a9f\Typo3Fractor\TYPO3v8\Fluid\ReplaceCaseDefaultWithDefaultCaseFluidFractor;
+
+return FractorConfiguration::configure()
+    ->withRules([ReplaceCaseDefaultWithDefaultCaseFluidFractor::class]);
diff --git a/packages/typo3-fractor/rules/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor.php b/packages/typo3-fractor/rules/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor.php
new file mode 100644
index 00000000..5b55ac34
--- /dev/null
+++ b/packages/typo3-fractor/rules/TYPO3v8/Fluid/ReplaceCaseDefaultWithDefaultCaseFluidFractor.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace a9f\Typo3Fractor\TYPO3v8\Fluid;
+
+use a9f\FractorFluid\Contract\FluidFractorRule;
+use Nette\Utils\Strings;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @changelog https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/8.0/Breaking-69863-ChangesInViewHelpersPostFluidStandalone.html
+ * @see \a9f\Typo3Fractor\Tests\TYPO3v8\Fluid\ReplaceCaseDefaultWithDefaultCaseFluidFractor\ReplaceCaseDefaultWithDefaultCaseFluidFractorTest
+ */
+final class ReplaceCaseDefaultWithDefaultCaseFluidFractor implements FluidFractorRule
+{
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition('Replace f:case with default attribute by f:defaultCase', [new CodeSample(
+            <<<'CODE_SAMPLE'
+<f:switch expression="{someVariable}">
+    <f:case value="foo">foo</f:case>
+    <f:case default="true">bar</f:case>
+</f:switch>
+CODE_SAMPLE
+            ,
+            <<<'CODE_SAMPLE'
+<f:switch expression="{someVariable}">
+    <f:case value="foo">foo</f:case>
+    <f:defaultCase>bar</f:defaultCase>
+</f:switch>
+CODE_SAMPLE
+        )]);
+    }
+
+    public function refactor(string $fluid): string
+    {
+        // Replace opening + closing tag with content
+        $fluid = Strings::replace(
+            $fluid,
+            '#<f:case\s+default="(true|1)"\s*>(.*?)</f:case>#si',
+            '<f:defaultCase>$2</f:defaultCase>'
+        );
+
+        // Replace self-closing tag
+        return Strings::replace($fluid, '#<f:case\s+default="(true|1)"\s*/>#si', '<f:defaultCase />');
+    }
+}