diff --git a/extensions/package.json b/extensions/package.json
index 9ac07779d67..864944d557d 100644
--- a/extensions/package.json
+++ b/extensions/package.json
@@ -3,7 +3,7 @@
   "version": "0.0.1",
   "description": "Dependencies shared by all extensions",
   "dependencies": {
-    "typescript": "2.9.0-insiders.20180503"
+    "typescript": "2.9.0-insiders.20180510"
   },
   "scripts": {
     "postinstall": "node ./postinstall"
diff --git a/extensions/typescript-language-features/src/features/completionItemProvider.ts b/extensions/typescript-language-features/src/features/completionItemProvider.ts
index d430743e556..00ae3f4280f 100644
--- a/extensions/typescript-language-features/src/features/completionItemProvider.ts
+++ b/extensions/typescript-language-features/src/features/completionItemProvider.ts
@@ -290,7 +290,7 @@ export default class TypeScriptCompletionItemProvider implements vscode.Completi
 			...typeConverters.Position.toFileLocationRequestArgs(file, position),
 			includeExternalModuleExports: completionConfiguration.autoImportSuggestions,
 			includeInsertTextCompletions: true,
-			triggerCharacter: context.triggerCharacter ? (context.triggerCharacter === '.' ? undefined : context.triggerCharacter) : undefined
+			triggerCharacter: context.triggerCharacter as Proto.CompletionsTriggerCharacter
 		};
 
 		let msg: Proto.CompletionEntry[] | undefined = undefined;
diff --git a/extensions/yarn.lock b/extensions/yarn.lock
index 38a10312c1e..9483ca1e431 100644
--- a/extensions/yarn.lock
+++ b/extensions/yarn.lock
@@ -2,6 +2,6 @@
 # yarn lockfile v1
 
 
-typescript@2.9.0-insiders.20180503:
-  version "2.9.0-insiders.20180503"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.0-insiders.20180503.tgz#dc5363403e7b384ad85b1a74a96412c36ea238a4"
+typescript@2.9.0-insiders.20180510:
+  version "2.9.0-insiders.20180510"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.0-insiders.20180510.tgz#2f9c37b904ddd8f8151e5eb25be11a3c4744b13f"