diff --git a/backend/tests/Unit/Element/ElementRepositoryContractTest.php b/backend/tests/Unit/Element/ElementRepositoryContractTest.php
new file mode 100644
index 0000000..84e5bb9
--- /dev/null
+++ b/backend/tests/Unit/Element/ElementRepositoryContractTest.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Tests\Unit\Element;
+
+use App\Element\Element;
+use App\Element\ElementRepository;
+use ReflectionMethod;
+use Tests\TestCase;
+
+class ElementRepositoryContractTest extends TestCase
+{
+    public function testUpdateAcceptsOnlyElement(): void
+    {
+        $method = new ReflectionMethod(ElementRepository::class, 'update');
+        $parameters = $method->getParameters();
+
+        $this->assertCount(1, $parameters);
+        $this->assertSame('element', $parameters[0]->getName());
+        $this->assertSame(
+            Element::class,
+            $parameters[0]->getType()->getName(),
+        );
+    }
+}
diff --git a/backend/tests/Unit/Element/ElementTest.php b/backend/tests/Unit/Element/ElementTest.php
index 16c08a7..89e9c84 100644
--- a/backend/tests/Unit/Element/ElementTest.php
+++ b/backend/tests/Unit/Element/ElementTest.php
@@ -68,4 +68,39 @@ class ElementTest extends TestCase
         $this->assertNull($rootElement->getYoutubeUrl());
         $this->assertNull($rootElement->getParentElement());
     }
+
+    public function testUpdatesEditableFields(): void
+    {
+        $set = new DomainSet(
+            id: 1,
+            name: 'Daily learning',
+            description: 'Daily learning description',
+            iconImageUrl: '/assets/daily-learning-icon.svg',
+        );
+        $element = new Element(
+            id: 1,
+            title: 'Original',
+            description: 'Original description',
+            iconImageUrl: '/assets/original.svg',
+            richText: '<p>Original</p>',
+            pdfPath: '/assets/pdfs/original.pdf',
+            youtubeUrl: 'https://www.youtube.com/watch?v=yHx-r4p6hHU',
+            set: $set,
+            parentElement: null,
+        );
+
+        $element->setTitle('Updated');
+        $element->setDescription('Updated description');
+        $element->setIconImageUrl(null);
+        $element->setRichText('<p>Updated</p>');
+        $element->setPdfPath(null);
+        $element->setYoutubeUrl(null);
+
+        $this->assertSame('Updated', $element->getTitle());
+        $this->assertSame('Updated description', $element->getDescription());
+        $this->assertNull($element->getIconImageUrl());
+        $this->assertSame('<p>Updated</p>', $element->getRichText());
+        $this->assertNull($element->getPdfPath());
+        $this->assertNull($element->getYoutubeUrl());
+    }
 }
diff --git a/backend/tests/Unit/Element/UseCases/UpdateElementFieldsTest.php b/backend/tests/Unit/Element/UseCases/UpdateElementFieldsTest.php
new file mode 100644
index 0000000..7c27c9c
--- /dev/null
+++ b/backend/tests/Unit/Element/UseCases/UpdateElementFieldsTest.php
@@ -0,0 +1,175 @@
+<?php
+
+namespace Tests\Unit\Element\UseCases;
+
+use App\Element\CreateElementDto;
+use App\Element\Element;
+use App\Element\UseCases\UpdateElement\UpdateDescription;
+use App\Element\UseCases\UpdateElement\UpdateDescriptionRequest;
+use App\Element\UseCases\UpdateElement\UpdateIconImageUrl;
+use App\Element\UseCases\UpdateElement\UpdateIconImageUrlRequest;
+use App\Element\UseCases\UpdateElement\UpdatePdfPath;
+use App\Element\UseCases\UpdateElement\UpdatePdfPathRequest;
+use App\Element\UseCases\UpdateElement\UpdateRichText;
+use App\Element\UseCases\UpdateElement\UpdateRichTextRequest;
+use App\Element\UseCases\UpdateElement\UpdateTitle;
+use App\Element\UseCases\UpdateElement\UpdateTitleRequest;
+use App\Element\UseCases\UpdateElement\UpdateYoutubeUrl;
+use App\Element\UseCases\UpdateElement\UpdateYoutubeUrlRequest;
+use App\Exceptions\BadRequestException;
+use App\Set\Set as DomainSet;
+use Tests\Fakes\FakeElementRepository;
+use Tests\TestCase;
+
+class UpdateElementFieldsTest extends TestCase
+{
+    private FakeElementRepository $elementRepo;
+
+    protected function setUp(): void
+    {
+        $this->elementRepo = new FakeElementRepository();
+    }
+
+    public function testUpdateTitleUpdatesOnlyTitle(): void
+    {
+        $element = $this->createFilledElement();
+        $updateTitle = new UpdateTitle($this->elementRepo);
+
+        $updatedElement = $updateTitle->execute(new UpdateTitleRequest(
+            id: $element->getId(),
+            title: 'Updated title',
+        ));
+
+        $this->assertSame('Updated title', $updatedElement->getTitle());
+        $this->assertSame(
+            $element->getDescription(),
+            $updatedElement->getDescription(),
+        );
+        $this->assertSame(
+            $element->getRichText(),
+            $updatedElement->getRichText(),
+        );
+    }
+
+    public function testUpdateTitleRejectsBlankTitle(): void
+    {
+        $this->createFilledElement();
+        $updateTitle = new UpdateTitle($this->elementRepo);
+
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('title is required');
+
+        $updateTitle->execute(new UpdateTitleRequest(id: 1, title: ''));
+    }
+
+    public function testUpdateDescriptionUpdatesOnlyDescription(): void
+    {
+        $element = $this->createFilledElement();
+        $updateDescription = new UpdateDescription($this->elementRepo);
+
+        $updatedElement = $updateDescription->execute(
+            new UpdateDescriptionRequest(
+                id: $element->getId(),
+                description: 'Updated description',
+            )
+        );
+
+        $this->assertSame(
+            'Updated description',
+            $updatedElement->getDescription(),
+        );
+        $this->assertSame($element->getTitle(), $updatedElement->getTitle());
+        $this->assertSame(
+            $element->getYoutubeUrl(),
+            $updatedElement->getYoutubeUrl(),
+        );
+    }
+
+    public function testUpdateIconImageUrlClearsEmptyString(): void
+    {
+        $element = $this->createFilledElement();
+        $updateIconImageUrl = new UpdateIconImageUrl($this->elementRepo);
+
+        $updatedElement = $updateIconImageUrl->execute(
+            new UpdateIconImageUrlRequest(
+                id: $element->getId(),
+                iconImageUrl: '',
+            )
+        );
+
+        $this->assertNull($updatedElement->getIconImageUrl());
+        $this->assertSame($element->getTitle(), $updatedElement->getTitle());
+    }
+
+    public function testUpdateRichTextUpdatesOnlyRichText(): void
+    {
+        $element = $this->createFilledElement();
+        $updateRichText = new UpdateRichText($this->elementRepo);
+
+        $updatedElement = $updateRichText->execute(
+            new UpdateRichTextRequest(
+                id: $element->getId(),
+                richText: '<p>Updated rich text</p>',
+            )
+        );
+
+        $this->assertSame(
+            '<p>Updated rich text</p>',
+            $updatedElement->getRichText(),
+        );
+        $this->assertSame(
+            $element->getDescription(),
+            $updatedElement->getDescription(),
+        );
+    }
+
+    public function testUpdatePdfPathClearsEmptyString(): void
+    {
+        $element = $this->createFilledElement();
+        $updatePdfPath = new UpdatePdfPath($this->elementRepo);
+
+        $updatedElement = $updatePdfPath->execute(
+            new UpdatePdfPathRequest(id: $element->getId(), pdfPath: '')
+        );
+
+        $this->assertNull($updatedElement->getPdfPath());
+        $this->assertSame($element->getTitle(), $updatedElement->getTitle());
+    }
+
+    public function testUpdateYoutubeUrlClearsEmptyString(): void
+    {
+        $element = $this->createFilledElement();
+        $updateYoutubeUrl = new UpdateYoutubeUrl($this->elementRepo);
+
+        $updatedElement = $updateYoutubeUrl->execute(
+            new UpdateYoutubeUrlRequest(
+                id: $element->getId(),
+                youtubeUrl: '',
+            )
+        );
+
+        $this->assertNull($updatedElement->getYoutubeUrl());
+        $this->assertSame($element->getTitle(), $updatedElement->getTitle());
+    }
+
+    private function createFilledElement(): Element
+    {
+        $set = new DomainSet(
+            id: 1,
+            name: 'Baderech',
+            description: 'Baderech description',
+            iconImageUrl: '/assets/baderech-icon.png',
+        );
+
+        return $this->elementRepo->create(new CreateElementDto(
+            set: $set,
+            title: 'Original title',
+            description: 'Original description',
+            iconImageUrl: '/assets/original-icon.png',
+            richText: '<p>Original rich text</p>',
+            pdfPath: '/assets/pdfs/original.pdf',
+            youtubeUrl: 'https://www.youtube.com/watch?v=yHx-r4p6hHU',
+            parentElement: null,
+        ));
+    }
+}
diff --git a/backend/tests/Unit/Element/UseCases/UpdateElementTest.php b/backend/tests/Unit/Element/UseCases/UpdateElementTest.php
index 0bb1195..0ce0d88 100644
--- a/backend/tests/Unit/Element/UseCases/UpdateElementTest.php
+++ b/backend/tests/Unit/Element/UseCases/UpdateElementTest.php
@@ -4,8 +4,14 @@ namespace Tests\Unit\Element\UseCases;
 
 use App\Element\CreateElementDto;
 use App\Element\Element;
+use App\Element\UseCases\UpdateElement\UpdateDescription;
+use App\Element\UseCases\UpdateElement\UpdateIconImageUrl;
 use App\Element\UseCases\UpdateElement\UpdateElement;
 use App\Element\UseCases\UpdateElement\UpdateElementRequest;
+use App\Element\UseCases\UpdateElement\UpdatePdfPath;
+use App\Element\UseCases\UpdateElement\UpdateRichText;
+use App\Element\UseCases\UpdateElement\UpdateTitle;
+use App\Element\UseCases\UpdateElement\UpdateYoutubeUrl;
 use App\Exceptions\BadRequestException;
 use App\Exceptions\NotFoundException;
 use App\Set\Set as DomainSet;
@@ -21,7 +27,15 @@ class UpdateElementTest extends TestCase
     protected function setUp(): void
     {
         $this->elementRepo = new FakeElementRepository();
-        $this->updateElement = new UpdateElement($this->elementRepo);
+        $this->updateElement = new UpdateElement(
+            new UpdateTitle($this->elementRepo),
+            new UpdateDescription($this->elementRepo),
+            new UpdateIconImageUrl($this->elementRepo),
+            new UpdateRichText($this->elementRepo),
+            new UpdatePdfPath($this->elementRepo),
+            new UpdateYoutubeUrl($this->elementRepo),
+            $this->elementRepo,
+        );
     }
 
     public function testUpdatesContentFields(): void
@@ -109,6 +123,55 @@ class UpdateElementTest extends TestCase
         $this->assertNull($updatedElement->getYoutubeUrl());
     }
 
+    public function testUpdatesOnlySuppliedFields(): void
+    {
+        $set = $this->createSet(1, 'Baderech');
+        $element = $this->createElement(
+            $set,
+            'Original title',
+            'Original description',
+            '/assets/original-icon.png',
+            '<p>Original rich text</p>',
+            '/assets/pdfs/original.pdf',
+            'https://www.youtube.com/watch?v=yHx-r4p6hHU&t=1s',
+            null,
+        );
+
+        $updatedElement = $this->updateElement->execute(
+            new UpdateElementRequest(
+                id: $element->getId(),
+                title: 'Updated title',
+                description: null,
+                iconImageUrl: null,
+                richText: null,
+                pdfPath: null,
+                youtubeUrl: null,
+            )
+        );
+
+        $this->assertSame('Updated title', $updatedElement->getTitle());
+        $this->assertSame(
+            'Original description',
+            $updatedElement->getDescription(),
+        );
+        $this->assertSame(
+            '/assets/original-icon.png',
+            $updatedElement->getIconImageUrl(),
+        );
+        $this->assertSame(
+            '<p>Original rich text</p>',
+            $updatedElement->getRichText(),
+        );
+        $this->assertSame(
+            '/assets/pdfs/original.pdf',
+            $updatedElement->getPdfPath(),
+        );
+        $this->assertSame(
+            'https://www.youtube.com/watch?v=yHx-r4p6hHU&t=1s',
+            $updatedElement->getYoutubeUrl(),
+        );
+    }
+
     public function testThrowsWhenIdMissing(): void
     {
         $this->expectException(BadRequestException::class);
@@ -125,6 +188,22 @@ class UpdateElementTest extends TestCase
         ));
     }
 
+    public function testThrowsWhenNothingProvided(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('nothing to update');
+
+        $this->updateElement->execute(new UpdateElementRequest(
+            id: 1,
+            title: null,
+            description: null,
+            iconImageUrl: null,
+            richText: null,
+            pdfPath: null,
+            youtubeUrl: null,
+        ));
+    }
+
     public function testThrowsWhenTitleIsBlank(): void
     {
         $this->expectException(BadRequestException::class);