diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70b6cc0..7121eec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## [Unreleased]
 
+- fix: Fix type conflicts on Product interfaces in WooGraphQL 0.21.1+. Props @robbiebel 🙌
 - chore: bump PHPStan to v2.0.x
 - chore: Test compatibility with WordPress 6.8 and WPGraphQL 2.3.
 - chore: Update Composer dev-dependencies and lint.
diff --git a/bin/_lib.sh b/bin/_lib.sh
index b8a0095..f222231 100644
--- a/bin/_lib.sh
+++ b/bin/_lib.sh
@@ -98,11 +98,19 @@ install_woographql() {
 
 	echo "Installing WooCommerce..."
 	if ! $(wp plugin is-installed woocommerce); then
-		wp plugin install woocommerce --activate
+		wp plugin install woocommerce --activate --allow-root
 	fi
 
 	if ! $(wp plugin is-installed wp-graphql-woocommerce); then
-		wp plugin install https://github.com/wp-graphql/wp-graphql-woocommerce/releases/download/v0.21.0/wp-graphql-woocommerce.zip --activate
+		wp plugin install https://github.com/wp-graphql/wp-graphql-woocommerce/archive/refs/heads/master.zip --allow-root
+		cd $WP_CORE_DIR/wp-content/plugins/wp-graphql-woocommerce
+
+		if [ ! -d vendor ]; then
+			composer install --no-dev
+		fi
+
+		wp plugin activate wp-graphql-woocommerce --allow-root
+
 	fi
 }
 
diff --git a/src/Extensions/WPGraphQLWooCommerce/Type/WPObject/SeoObjects.php b/src/Extensions/WPGraphQLWooCommerce/Type/WPObject/SeoObjects.php
index 30d3643..4ea84be 100644
--- a/src/Extensions/WPGraphQLWooCommerce/Type/WPObject/SeoObjects.php
+++ b/src/Extensions/WPGraphQLWooCommerce/Type/WPObject/SeoObjects.php
@@ -35,11 +35,46 @@ public static function init(): void {
 	public static function register(): void {
 		// Set SEO field types for product children.
 		$product_types = WP_GraphQL_WooCommerce::get_enabled_product_types();
+		/**
+		 * @todo: remove this when we don't need to support WooGraphQL< 0.21.1
+		 * @see https://github.com/AxeWP/wp-graphql-rank-math/pull/115#issuecomment-2660900767
+		 */
+		if ( defined( 'WPGRAPHQL_WOOCOMMERCE_VERSION' ) && version_compare( WPGRAPHQL_WOOCOMMERCE_VERSION, '0.21.1', '>=' ) ) {
+			$product_types = array_merge(
+				$product_types,
+				[
+					'DownloadableProduct',
+					'InventoriedProduct',
+					'ProductUnion',
+					'ProductWithAttributes',
+					'ProductWithDimensions',
+					'ProductWithPricing',
+					'ProductWithVariations',
+					'ProductVariation',
+				]
+			);
+		}
 
 		foreach ( $product_types as $graphql_type_name ) {
 			Utils::overload_graphql_field_type( $graphql_type_name, 'seo', 'RankMathProductObjectSeo' );
 		}
 
+		/**
+		 * @todo: remove this when we don't need to support WooGraphQL< 0.21.1
+		 * @see https://github.com/AxeWP/wp-graphql-rank-math/pull/115#issuecomment-2660900767
+		 */
+		if ( defined( 'WPGRAPHQL_WOOCOMMERCE_VERSION' ) && version_compare( WPGRAPHQL_WOOCOMMERCE_VERSION, '0.21.1', '<' ) ) {
+			self::register_product_variation_types();
+		}
+	}
+
+	/**
+	 * Registers the SEO types for product variations.
+	 *
+	 * @todo: remove this when we don't need to support WooGraphQL< 0.21.1
+	 * @see https://github.com/AxeWP/wp-graphql-rank-math/pull/115#issuecomment-2660900767
+	 */
+	private static function register_product_variation_types(): void {
 		// Register the Product Variation SEO type and apply it to the Product Variation and children.
 		$type_name_for_product_variation = 'RankMathProductVariationObjectSeo';