diff --git a/.github/workflows/continous-integration.yml b/.github/workflows/continous-integration.yml
index e99d5f12..90a10fbe 100644
--- a/.github/workflows/continous-integration.yml
+++ b/.github/workflows/continous-integration.yml
@@ -62,7 +62,7 @@ jobs:
           WP_VERSION: ${{ matrix.wordpress }}
           PHP_VERSION: ${{ matrix.php }}
         run: |
-          HPOS="${{ matrix.hpos }}" FILTER="acceptance --fail-fast ${{ matrix.coverage == true && '--coverage=acceptance.serialized' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
+          HPOS="${{ matrix.hpos }}" FILTER="acceptance --fail-fast ${{ matrix.coverage == true && '--coverage=acceptance.cov' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
 
       - name: Retry on failure
         id: retry
@@ -72,7 +72,7 @@ jobs:
           WP_VERSION: ${{ matrix.wordpress }}
           PHP_VERSION: ${{ matrix.php }}
         run: |
-          HPOS="${{ matrix.hpos }}" FILTER="acceptance ${{ matrix.coverage == true && '--coverage=acceptance.serialized' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
+          HPOS="${{ matrix.hpos }}" FILTER="acceptance ${{ matrix.coverage == true && '--coverage=acceptance.cov' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
 
       - name: Fail if both attempts failed
         if: ${{ steps.tests.outcome == 'failure' && steps.retry.outcome == 'failure' }}
@@ -83,7 +83,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: coverage-acceptance
-          path: tests/_output/acceptance.serialized
+          path: tests/_output/acceptance.cov
           if-no-files-found: ignore
 
   functional:
@@ -133,7 +133,7 @@ jobs:
           WP_VERSION: ${{ matrix.wordpress }}
           PHP_VERSION: ${{ matrix.php }}
         run: |
-          HPOS="${{ matrix.hpos }}" FILTER="functional --fail-fast ${{ matrix.coverage == true && '--coverage=functional.serialized' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
+          HPOS="${{ matrix.hpos }}" FILTER="functional --fail-fast ${{ matrix.coverage == true && '--coverage=functional.cov' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
 
       - name: Retry on failure
         id: retry
@@ -143,7 +143,7 @@ jobs:
           WP_VERSION: ${{ matrix.wordpress }}
           PHP_VERSION: ${{ matrix.php }}
         run: |
-          HPOS="${{ matrix.hpos }}" FILTER="functional ${{ matrix.coverage == true && '--coverage=functional.serialized' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
+          HPOS="${{ matrix.hpos }}" FILTER="functional ${{ matrix.coverage == true && '--coverage=functional.cov' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
 
       - name: Fail if both attempts failed
         if: ${{ steps.tests.outcome == 'failure' && steps.retry.outcome == 'failure' }}
@@ -154,7 +154,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: coverage-functional
-          path: tests/_output/functional.serialized
+          path: tests/_output/functional.cov
           if-no-files-found: ignore
 
   wpunit:
@@ -204,7 +204,7 @@ jobs:
           WP_VERSION: ${{ matrix.wordpress }}
           PHP_VERSION: ${{ matrix.php }}
         run: |
-          HPOS="${{ matrix.hpos }}" FILTER="wpunit --fail-fast ${{ matrix.coverage == true && '--coverage=wpunit.serialized' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
+          HPOS="${{ matrix.hpos }}" FILTER="wpunit --fail-fast ${{ matrix.coverage == true && '--coverage=wpunit.cov' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
 
       - name: Retry on failure
         id: retry
@@ -214,7 +214,7 @@ jobs:
           WP_VERSION: ${{ matrix.wordpress }}
           PHP_VERSION: ${{ matrix.php }}
         run: |
-          HPOS="${{ matrix.hpos }}" FILTER="wpunit ${{ matrix.coverage == true && '--coverage=wpunit.serialized' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
+          HPOS="${{ matrix.hpos }}" FILTER="wpunit ${{ matrix.coverage == true && '--coverage=wpunit.cov' || '' }} ${{ matrix.debug }}" composer dRunTestStandalone
 
       - name: Fail if both attempts failed
         if: ${{ steps.tests.outcome == 'failure' && steps.retry.outcome == 'failure' }}
@@ -225,7 +225,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: coverage-wpunit
-          path: tests/_output/wpunit.serialized
+          path: tests/_output/wpunit.cov
           if-no-files-found: ignore
 
   coverage:
@@ -248,7 +248,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          composer global require phpunit/phpcov php-coveralls/php-coveralls
+          composer global require phpunit/phpcov:^8 php-coveralls/php-coveralls
 
       - name: Download coverage artifacts
         uses: actions/download-artifact@v4
@@ -262,7 +262,7 @@ jobs:
         run: |
           mkdir -p tests/_output
           ls -la coverage-files/ 2>/dev/null || echo "No coverage files found"
-          if ls coverage-files/*.serialized 1>/dev/null 2>&1; then
+          if ls coverage-files/*.cov 1>/dev/null 2>&1; then
             phpcov merge --clover=tests/_output/coverage.xml coverage-files
           else
             echo "No serialized coverage files to merge"
diff --git a/includes/type/interface/class-product-attribute.php b/includes/type/interface/class-product-attribute.php
index ead15792..3deecbec 100644
--- a/includes/type/interface/class-product-attribute.php
+++ b/includes/type/interface/class-product-attribute.php
@@ -58,7 +58,7 @@ class Product_Attribute {
 				'type'        => 'String',
 				'description' => __( 'Attribute name', 'wp-graphql-woocommerce' ),
 				'resolve'     => static function ( $attribute ) {
-					return ! empty( $attribute->get_name() ) ? $attribute->get_name() : null;
+					return ! empty( $attribute->get_name() ) ? sanitize_title( $attribute->get_name() ) : null;
 				},
 			],
 			'label'       => [
diff --git a/tests/wpunit/AttributeNameConsistencyTest.php b/tests/wpunit/AttributeNameConsistencyTest.php
new file mode 100644
index 00000000..3f4b7100
--- /dev/null
+++ b/tests/wpunit/AttributeNameConsistencyTest.php
@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * Tests that ProductAttribute.name and VariationAttribute.name are consistent
+ * for both local and global attributes.
+ *
+ * @see https://github.com/wp-graphql/wp-graphql-woocommerce/issues/965
+ */
+class AttributeNameConsistencyTest extends \Tests\WPGraphQL\WooCommerce\TestCase\WooGraphQLTestCase {
+	/**
+	 * Test that local and global ProductAttribute names are sanitized
+	 * and match VariationAttribute names.
+	 */
+	public function testAttributeNameConsistencyBetweenProductAndVariation() {
+		$product_ids  = $this->factory->product_variation->createSome();
+		$product_id   = $product_ids['product'];
+		$variation_id = $product_ids['variations'][0];
+
+		$query = '
+			query ($productId: ID!, $variationId: ID!) {
+				product(id: $productId) {
+					... on VariableProduct {
+						attributes {
+							nodes {
+								name
+								label
+								scope
+							}
+						}
+					}
+				}
+				productVariation(id: $variationId) {
+					attributes {
+						nodes {
+							name
+							label
+							value
+						}
+					}
+				}
+			}
+		';
+
+		$variables = [
+			'productId'   => $this->toRelayId( 'post', $product_id ),
+			'variationId' => $this->toRelayId( 'post', $variation_id ),
+		];
+
+		$response = $this->graphql( compact( 'query', 'variables' ) );
+
+		// Get the variation's attribute names to use as expected values.
+		$product   = wc_get_product( $variation_id );
+		$var_attrs = $product->get_attributes();
+
+		$expected = [];
+		foreach ( $var_attrs as $name => $value ) {
+			$is_taxonomy = taxonomy_exists( $name );
+
+			// The ProductAttribute.name should be sanitized and match the VariationAttribute.name.
+			$expected[] = $this->expectedNode(
+				'product.attributes.nodes',
+				[
+					$this->expectedField( 'name', $is_taxonomy ? $name : sanitize_title( $name ) ),
+				]
+			);
+
+			// The VariationAttribute should have the same name.
+			$expected[] = $this->expectedNode(
+				'productVariation.attributes.nodes',
+				[
+					$this->expectedField( 'name', $is_taxonomy ? $name : sanitize_title( $name ) ),
+				]
+			);
+		}
+
+		$this->assertQuerySuccessful( $response, $expected );
+	}
+}
diff --git a/tests/wpunit/ProductAttributeConnectionsTest.php b/tests/wpunit/ProductAttributeConnectionsTest.php
index b2f5d21b..14a52943 100644
--- a/tests/wpunit/ProductAttributeConnectionsTest.php
+++ b/tests/wpunit/ProductAttributeConnectionsTest.php
@@ -182,7 +182,7 @@ class ProductAttributeConnectionsTest extends \Tests\WPGraphQL\WooCommerce\TestC
 			$this->expectedNode(
 				'product.localAttributes.nodes',
 				[
-					$this->expectedField( 'name', 'Engraving' ),
+					$this->expectedField( 'name', 'engraving' ),
 				]
 			),
 		];
@@ -193,7 +193,7 @@ class ProductAttributeConnectionsTest extends \Tests\WPGraphQL\WooCommerce\TestC
 		$local_attrs = $this->lodashGet( $response, 'data.product.localAttributes.nodes', [] );
 		$engraving_node = null;
 		foreach ( $local_attrs as $node ) {
-			if ( 'Engraving' === $node['name'] ) {
+			if ( 'engraving' === $node['name'] ) {
 				$engraving_node = $node;
 				break;
 			}