diff --git a/app/code/Magento/Catalog/Model/ProductRepository.php b/app/code/Magento/Catalog/Model/ProductRepository.php
index e814dc03cf37f..2b9ee8f862907 100644
--- a/app/code/Magento/Catalog/Model/ProductRepository.php
+++ b/app/code/Magento/Catalog/Model/ProductRepository.php
@@ -333,8 +333,13 @@ protected function initializeProductData(array $productData, $createNew)
                 $product->setWebsiteIds([$this->storeManager->getStore(true)->getWebsiteId()]);
             }
         } else {
-            unset($this->instances[$productData['sku']]);
-            $product = $this->get($productData['sku']);
+            if (!empty($productData['id'])) {
+                unset($this->instancesById[$productData['id']]);
+                $product = $this->getById($productData['id']);
+            } else {
+                unset($this->instances[$productData['sku']]);
+                $product = $this->get($productData['sku']);
+            }
         }
 
         foreach ($productData as $key => $value) {
@@ -562,7 +567,7 @@ public function save(\Magento\Catalog\Api\Data\ProductInterface $product, $saveO
         $tierPrices = $product->getData('tier_price');
 
         try {
-            $existingProduct = $this->get($product->getSku());
+            $existingProduct = $product->getId() ? $this->getById($product->getId()) : $this->get($product->getSku());
 
             $product->setData(
                 $this->resourceModel->getLinkField(),
diff --git a/app/code/Magento/Catalog/Test/Unit/Model/ProductRepositoryTest.php b/app/code/Magento/Catalog/Test/Unit/Model/ProductRepositoryTest.php
index c98705b4eda63..2a9a867fa20b5 100644
--- a/app/code/Magento/Catalog/Test/Unit/Model/ProductRepositoryTest.php
+++ b/app/code/Magento/Catalog/Test/Unit/Model/ProductRepositoryTest.php
@@ -610,7 +610,7 @@ public function testSaveException()
             ->willReturn(true);
         $this->resourceModelMock->expects($this->once())->method('save')->with($this->productMock)
             ->willThrowException(new \Magento\Eav\Model\Entity\Attribute\Exception(__('123')));
-        $this->productMock->expects($this->once())->method('getId')->willReturn(null);
+        $this->productMock->expects($this->exactly(2))->method('getId')->willReturn(null);
         $this->extensibleDataObjectConverterMock
             ->expects($this->once())
             ->method('toNestedArray')
@@ -634,7 +634,7 @@ public function testSaveInvalidProductException()
         $this->initializationHelperMock->expects($this->never())->method('initialize');
         $this->resourceModelMock->expects($this->once())->method('validate')->with($this->productMock)
             ->willReturn(['error1', 'error2']);
-        $this->productMock->expects($this->never())->method('getId');
+        $this->productMock->expects($this->once())->method('getId')->willReturn(null);
         $this->extensibleDataObjectConverterMock
             ->expects($this->once())
             ->method('toNestedArray')
diff --git a/dev/tests/integration/testsuite/Magento/Catalog/Model/ProductRepositoryTest.php b/dev/tests/integration/testsuite/Magento/Catalog/Model/ProductRepositoryTest.php
new file mode 100644
index 0000000000000..9518e9c0cdf4f
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Catalog/Model/ProductRepositoryTest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Catalog\Model;
+
+use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Catalog\Model\ResourceModel\Product as ProductResource;
+use Magento\TestFramework\Helper\Bootstrap;
+
+/**
+ * Provide tests for ProductRepository model.
+ */
+class ProductRepositoryTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * Test subject.
+     *
+     * @var ProductRepositoryInterface
+     */
+    private $productRepository;
+
+    /**
+     * @inheritdoc
+     */
+    protected function setUp()
+    {
+        $this->productRepository = Bootstrap::getObjectManager()->get(ProductRepositoryInterface::class);
+    }
+
+    /**
+     * Test Product Repository can change(update) "sku" for given product.
+     *
+     * @magentoDataFixture Magento/Catalog/_files/product_simple.php
+     * @magentoAppArea adminhtml
+     */
+    public function testUpdateProductSku()
+    {
+        $newSku = 'simple-edited';
+        $productId = Bootstrap::getObjectManager()->get(ProductResource::class)->getIdBySku('simple');
+        $initialProduct = Bootstrap::getObjectManager()->create(Product::class)->load($productId);
+
+        $initialProduct->setSku($newSku);
+        $this->productRepository->save($initialProduct);
+
+        $updatedProduct = Bootstrap::getObjectManager()->create(Product::class);
+        $updatedProduct->load($productId);
+        self::assertSame($newSku, $updatedProduct->getSku());
+    }
+}