diff --git a/extensions/typescript-language-features/src/extension.browser.ts b/extensions/typescript-language-features/src/extension.browser.ts
index f39740bab23..6cba39e0c0a 100644
--- a/extensions/typescript-language-features/src/extension.browser.ts
+++ b/extensions/typescript-language-features/src/extension.browser.ts
@@ -61,7 +61,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<Api> {
 		new TypeScriptVersion(
 			TypeScriptVersionSource.Bundled,
 			vscode.Uri.joinPath(context.extensionUri, 'dist/browser/typescript/tsserver.web.js').toString(),
-			API.fromSimpleString('5.8.3')));
+			API.fromSimpleString('5.9.0')));
 
 	let experimentTelemetryReporter: IExperimentationTelemetryReporter | undefined;
 	const packageInfo = getPackageInfo(context);
diff --git a/extensions/typescript-language-features/src/languageFeatures/hover.ts b/extensions/typescript-language-features/src/languageFeatures/hover.ts
index ff7719c0986..cc08b7f5b94 100644
--- a/extensions/typescript-language-features/src/languageFeatures/hover.ts
+++ b/extensions/typescript-language-features/src/languageFeatures/hover.ts
@@ -56,7 +56,6 @@ class TypeScriptHoverProvider implements vscode.HoverProvider {
 			new vscode.VerboseHover(
 				contents,
 				range,
-				// @ts-expect-error
 				/*canIncreaseVerbosity*/ response.body.canIncreaseVerbosityLevel,
 				/*canDecreaseVerbosity*/ verbosityLevel !== 0
 			) : new vscode.Hover(