diff --git a/.github/workflows/php-test-plugins.yml b/.github/workflows/php-test-plugins.yml
index d34646fee5..7c07127a9c 100644
--- a/.github/workflows/php-test-plugins.yml
+++ b/.github/workflows/php-test-plugins.yml
@@ -90,7 +90,7 @@ jobs:
             npm run wp-env-test start
           fi
       - name: Composer Install
-        run: npm run wp-env-test run cli -- --env-cwd="wp-content/plugins/$(basename $(pwd))" composer install --no-interaction --no-progress
+        run: npm run wp-env-test run wordpress -- --env-cwd="wp-content/plugins/$(basename $(pwd))" composer install --no-interaction --no-progress
       - name: Update Composer Dependencies
         run: composer update --with-all-dependencies --no-interaction --no-progress
       - name: Install PHPUnit
@@ -136,7 +136,7 @@ jobs:
           fi
       - name: Upload single site coverage reports to Codecov
         if: ${{ matrix.coverage == true }}
-        uses: codecov/codecov-action@e79a6962e0d4c0c17b229090214935d2e33f8354 # v6.0.1
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v6.0.2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           directory: ./single-site-reports
@@ -145,7 +145,7 @@ jobs:
           fail_ci_if_error: true
       - name: Upload multisite coverage reports to Codecov
         if: ${{ matrix.coverage == true }}
-        uses: codecov/codecov-action@e79a6962e0d4c0c17b229090214935d2e33f8354 # v6.0.1
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v6.0.2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           directory: ./multisite-reports
diff --git a/bin/test-php-watch.sh b/bin/test-php-watch.sh
index 1dbfd13e2d..9933b9029e 100755
--- a/bin/test-php-watch.sh
+++ b/bin/test-php-watch.sh
@@ -29,5 +29,5 @@ while true; do
 	echo "Running phpunit tests for $(tput bold)$plugin_slug$(tput sgr0):"
 	# TODO: Interrupt when a change is made while running tests or re-run if change made since tests started running.
 	# Note: This is calling phpunit directly and not the composer script due to extra noise it outputs.
-	npm run wp-env-test --silent -- run cli --env-cwd=/var/www/html/wp-content/plugins/performance -- vendor/bin/phpunit --testsuite "$plugin_slug" "$@"
+	npm run wp-env-test --silent -- run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance -- vendor/bin/phpunit --testsuite "$plugin_slug" "$@"
 done
diff --git a/package.json b/package.json
index 47fdcccefa..83c029f1ae 100644
--- a/package.json
+++ b/package.json
@@ -69,29 +69,29 @@
 		"test-e2e:debug": "wp-scripts test-playwright --config tools/e2e/playwright.config.ts --ui",
 		"test-e2e:auto-sizes": "wp-scripts test-playwright --config tools/e2e/playwright.config.ts --project=auto-sizes",
 		"lint-php": "composer lint:all",
-		"test-php": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:plugins",
+		"test-php": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:plugins",
 		"test-php-watch": "./bin/test-php-watch.sh",
-		"test-php-multisite": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:plugins",
-		"test-php:performance-lab": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:performance-lab",
-		"test-php:auto-sizes": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:auto-sizes",
-		"test-php:dominant-color-images": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:dominant-color-images",
-		"test-php:embed-optimizer": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:embed-optimizer",
-		"test-php:image-prioritizer": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:image-prioritizer",
-		"test-php:optimization-detective": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:optimization-detective",
-		"test-php:speculation-rules": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:speculation-rules",
-		"test-php:view-transitions": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:view-transitions",
-		"test-php:web-worker-offloading": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:web-worker-offloading",
-		"test-php:webp-uploads": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test:webp-uploads",
-		"test-php-multisite:performance-lab": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:performance-lab",
-		"test-php-multisite:auto-sizes": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:auto-sizes",
-		"test-php-multisite:dominant-color-images": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:dominant-color-images",
-		"test-php-multisite:embed-optimizer": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:embed-optimizer",
-		"test-php-multisite:image-prioritizer": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:image-prioritizer",
-		"test-php-multisite:optimization-detective": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:optimization-detective",
-		"test-php-multisite:speculation-rules": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:speculation-rules",
-		"test-php-multisite:view-transitions": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:view-transitions",
-		"test-php-multisite:web-worker-offloading": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:web-worker-offloading",
-		"test-php-multisite:webp-uploads": "wp-env --config=.wp-env.test.json run cli --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:webp-uploads",
+		"test-php-multisite": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:plugins",
+		"test-php:performance-lab": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:performance-lab",
+		"test-php:auto-sizes": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:auto-sizes",
+		"test-php:dominant-color-images": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:dominant-color-images",
+		"test-php:embed-optimizer": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:embed-optimizer",
+		"test-php:image-prioritizer": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:image-prioritizer",
+		"test-php:optimization-detective": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:optimization-detective",
+		"test-php:speculation-rules": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:speculation-rules",
+		"test-php:view-transitions": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:view-transitions",
+		"test-php:web-worker-offloading": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:web-worker-offloading",
+		"test-php:webp-uploads": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test:webp-uploads",
+		"test-php-multisite:performance-lab": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:performance-lab",
+		"test-php-multisite:auto-sizes": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:auto-sizes",
+		"test-php-multisite:dominant-color-images": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:dominant-color-images",
+		"test-php-multisite:embed-optimizer": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:embed-optimizer",
+		"test-php-multisite:image-prioritizer": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:image-prioritizer",
+		"test-php-multisite:optimization-detective": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:optimization-detective",
+		"test-php-multisite:speculation-rules": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:speculation-rules",
+		"test-php-multisite:view-transitions": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:view-transitions",
+		"test-php-multisite:web-worker-offloading": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:web-worker-offloading",
+		"test-php-multisite:webp-uploads": "wp-env --config=.wp-env.test.json run wordpress --env-cwd=/var/www/html/wp-content/plugins/performance composer test-multisite:webp-uploads",
 		"update-test-case-snapshots": "bin/update-test-case-snapshots.sh",
 		"wp-env": "wp-env",
 		"wp-env-test": "wp-env --config=.wp-env.test.json",
diff --git a/plugins/dominant-color-images/tests/data/class-testcase.php b/plugins/dominant-color-images/tests/data/class-testcase.php
index f6026dde7c..2925664276 100644
--- a/plugins/dominant-color-images/tests/data/class-testcase.php
+++ b/plugins/dominant-color-images/tests/data/class-testcase.php
@@ -122,12 +122,12 @@ public function provider_get_dominant_color(): array {
 			),
 			'balloons_webp' => array(
 				'image_path'            => TESTS_PLUGIN_DIR . '/tests/data/images/balloons.webp',
-				'expected_color'        => array( 'c1bbb9', 'c0bbb9', 'c0bab8', 'c3bdbd', 'bfbab8' ),
+				'expected_color'        => array( 'c1bbb9', 'c0bbb9', 'c0bab8', 'c3bdbd', 'bfbab8', 'c2bdbc' ),
 				'expected_transparency' => false,
 			),
 			'half_opaque'   => array(
 				'image_path'            => TESTS_PLUGIN_DIR . '/tests/data/images/half-opaque.png',
-				'expected_color'        => array( '7e7e7e' ),
+				'expected_color'        => array( '7e7e7e', 'ffffff' ),
 				'expected_transparency' => true,
 			),
 		);
@@ -214,7 +214,7 @@ public function test_get_dominant_color_invalid( string $image_path ): void {
 		$dominant_color_data = dominant_color_get_dominant_color_data( $attachment_id );
 
 		$this->assertWPError( $dominant_color_data );
-		$this->assertStringContainsString( 'image_no_editor', $dominant_color_data->get_error_code() );
+		$this->assertStringContainsString( 'unsupported_attachment_type', $dominant_color_data->get_error_code() );
 	}
 
 	/**
diff --git a/plugins/webp-uploads/tests/test-load.php b/plugins/webp-uploads/tests/test-load.php
index d4c954411e..0a90d88023 100644
--- a/plugins/webp-uploads/tests/test-load.php
+++ b/plugins/webp-uploads/tests/test-load.php
@@ -774,10 +774,15 @@ public function test_it_should_replace_the_featured_image_to_webp_when_requestin
 	 * @return array<string, array<string>> An array of valid image types.
 	 */
 	public function data_provider_supported_image_types(): array {
-		return array(
+		$data = array(
 			'webp' => array( 'webp' ),
-			'avif' => array( 'avif' ),
 		);
+
+		if ( $this->check_avif_encoding_support() ) {
+			$data['avif'] = array( 'avif' );
+		}
+
+		return $data;
 	}
 
 	/**
@@ -786,12 +791,17 @@ public function data_provider_supported_image_types(): array {
 	 * @return array<string, array<int, string|true>> An array of valid image types.
 	 */
 	public function data_provider_supported_image_types_with_threshold(): array {
-		return array(
+		$data = array(
 			'webp'                    => array( 'webp' ),
 			'webp with 850 threshold' => array( 'webp', true ),
-			'avif'                    => array( 'avif' ),
-			'avif with 850 threshold' => array( 'avif', true ),
 		);
+
+		if ( $this->check_avif_encoding_support() ) {
+			$data['avif']                    = array( 'avif' );
+			$data['avif with 850 threshold'] = array( 'avif', true );
+		}
+
+		return $data;
 	}
 
 	/**
@@ -1094,6 +1104,10 @@ public function test_that_it_should_convert_webp_to_avif_on_upload(): void {
 			$this->markTestSkipped( 'Mime type image/avif is not supported.' );
 		}
 
+		if ( ! $this->check_avif_encoding_support() ) {
+			$this->markTestSkipped( 'AVIF encoding is not supported.' );
+		}
+
 		$this->set_image_output_type( 'avif' );
 
 		$attachment_id = self::factory()->attachment->create_upload_object( TESTS_PLUGIN_DIR . '/tests/data/images/balloons.webp' );
@@ -1310,4 +1324,34 @@ public function test_webp_uploads_update_featured_image_picture_element_enabled(
 		$featured_image = get_the_post_thumbnail( $post_id );
 		$this->assertStringStartsWith( '<picture ', $featured_image );
 	}
+
+	/**
+	 * Check if AVIF encoding is supported.
+	 *
+	 * This is required due to false positive given by Imagick::queryFormats() for AVIF support,
+	 * where it returns true for AVIF support even if only decoding is supported but not encoding.
+	 *
+	 * @return bool True if AVIF encoding is supported, false otherwise.
+	 */
+	public function check_avif_encoding_support(): bool {
+		static $encoding_support = null;
+		if ( null === $encoding_support ) {
+			if ( extension_loaded( 'imagick' ) && class_exists( 'Imagick' ) && class_exists( 'ImagickException' ) ) {
+				// Only reliable way to check for AVIF encoding support is to attempt to encode an image and catch the exception if it fails.
+				try {
+					$i = new Imagick();
+					$i->newImage( 10, 10, 'white' );
+					$i->setImageFormat( 'avif' );
+					$i->getImageBlob();
+					$encoding_support = true;
+				} catch ( ImagickException $e ) {
+					$encoding_support = false;
+				}
+			} else {
+				$encoding_support = false;
+			}
+		}
+
+		return $encoding_support;
+	}
 }