diff --git a/gutenberg.php b/gutenberg.php
index ebf360f10fccc..bf46707ec50d3 100644
--- a/gutenberg.php
+++ b/gutenberg.php
@@ -26,7 +26,7 @@
 function gutenberg_wordpress_version_notice() {
 	echo '<div class="error"><p>';
 	/* translators: %s: Minimum required version */
-	printf( __( 'Gutenberg requires WordPress %s or later to function properly. Please upgrade WordPress before activating Gutenberg.', 'gutenberg' ), '5.8' );
+	printf( __( 'Gutenberg requires WordPress %s or later to function properly. Please upgrade WordPress before activating Gutenberg.', 'gutenberg' ), '5.9' );
 	echo '</p></div>';
 
 	deactivate_plugins( array( 'gutenberg/gutenberg.php' ) );
@@ -64,7 +64,7 @@ function gutenberg_pre_init() {
 	// Compare against major release versions (X.Y) rather than minor (X.Y.Z)
 	// unless a minor release is the actual minimum requirement. WordPress reports
 	// X.Y for its major releases.
-	if ( version_compare( $version, '5.8', '<' ) ) {
+	if ( version_compare( $version, '5.9', '<' ) ) {
 		add_action( 'admin_notices', 'gutenberg_wordpress_version_notice' );
 		return;
 	}
diff --git a/lib/init.php b/lib/init.php
index 9ba46a1f41fa2..b867dd472552f 100644
--- a/lib/init.php
+++ b/lib/init.php
@@ -58,30 +58,6 @@ function gutenberg_menu() {
 }
 add_action( 'admin_menu', 'gutenberg_menu', 9 );
 
-/**
- * Site editor's Menu.
- *
- * Adds a new wp-admin menu item for the Site editor.
- *
- * @since 9.4.0
- */
-function gutenberg_site_editor_menu() {
-	if ( wp_is_block_theme() ) {
-		add_theme_page(
-			__( 'Editor (beta)', 'gutenberg' ),
-			sprintf(
-			/* translators: %s: "beta" label. */
-				__( 'Editor %s', 'gutenberg' ),
-				'<span class="awaiting-mod">' . __( 'beta', 'gutenberg' ) . '</span>'
-			),
-			'edit_theme_options',
-			'gutenberg-edit-site',
-			'gutenberg_edit_site_page'
-		);
-	}
-}
-add_action( 'admin_menu', 'gutenberg_site_editor_menu', 9 );
-
 /**
  * Outputs a WP REST API nonce.
  */
diff --git a/packages/e2e-test-utils-playwright/src/admin/visit-site-editor.ts b/packages/e2e-test-utils-playwright/src/admin/visit-site-editor.ts
index 0c374f2fe404b..ab66de030feb2 100644
--- a/packages/e2e-test-utils-playwright/src/admin/visit-site-editor.ts
+++ b/packages/e2e-test-utils-playwright/src/admin/visit-site-editor.ts
@@ -30,11 +30,10 @@ export async function visitSiteEditor(
 	skipWelcomeGuide = true
 ) {
 	const path = addQueryArgs( '', {
-		page: 'gutenberg-edit-site',
 		...query,
 	} ).slice( 1 );
 
-	await this.visitAdminPage( 'themes.php', path );
+	await this.visitAdminPage( 'site-editor.php', path );
 	await this.page.waitForSelector( CANVAS_SELECTOR );
 
 	if ( skipWelcomeGuide ) {
diff --git a/packages/e2e-test-utils/src/site-editor.js b/packages/e2e-test-utils/src/site-editor.js
index e32ad01cc396e..a30d8b5455037 100644
--- a/packages/e2e-test-utils/src/site-editor.js
+++ b/packages/e2e-test-utils/src/site-editor.js
@@ -248,11 +248,10 @@ export async function siteEditorNavigateSequence( labels ) {
  */
 export async function visitSiteEditor( query, skipWelcomeGuide = true ) {
 	query = addQueryArgs( '', {
-		page: 'gutenberg-edit-site',
 		...query,
 	} ).slice( 1 );
 
-	await visitAdminPage( 'themes.php', query );
+	await visitAdminPage( 'site-editor.php', query );
 	await page.waitForSelector( SELECTORS.visualEditor );
 
 	if ( skipWelcomeGuide ) {