diff --git a/README.md b/README.md
index be487e54..a264ba76 100644
--- a/README.md
+++ b/README.md
@@ -25,10 +25,10 @@ This npm module is bundled and distributed in the [monaco-editor](https://www.np
 
 ## Development
 
-* `git clone https://github.com/Microsoft/monaco-css`
-* `cd monaco-css`
 * `npm install .`
-* `npm run prepublish`
+* compile with `npm run compile`
+* watch with `npm run watch`
+* `npm run prepublishOnly`
 * open `$/monaco-css/test/index.html` in your favorite browser.
 
 ## License
diff --git a/package-lock.json b/package-lock.json
index 4e940396..b808d1ce 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,15 +11,15 @@
       "dev": true
     },
     "monaco-editor-core": {
-      "version": "0.16.0",
-      "resolved": "https://registry.npmjs.org/monaco-editor-core/-/monaco-editor-core-0.16.0.tgz",
-      "integrity": "sha512-8tm8vq0SVuQ+VXZFtPIEIronK3102SYCWe8wviWu/5TV4zlDQcf4YdzI6A4CrNqbUc46dD0ngijaKWoRSViI8g==",
+      "version": "0.18.1",
+      "resolved": "https://registry.npmjs.org/monaco-editor-core/-/monaco-editor-core-0.18.1.tgz",
+      "integrity": "sha512-euzXzmwjZFG0oAPGjICMwINcZBzQDyfGDYlAR5YNMBJZO9Bmkqq1xpTTze/qQ0KKbVmawFXiwgUbg7WVgebP9Q==",
       "dev": true
     },
     "monaco-languages": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/monaco-languages/-/monaco-languages-1.7.0.tgz",
-      "integrity": "sha512-2YrYlkCF/g2H0PDt/ERax2IStaihZ17v1JkYnj2xEALYNah0pbQvGH9gXJvdVx0EpBoSRmxVnrwwM2oBWWOjSQ==",
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/monaco-languages/-/monaco-languages-1.8.0.tgz",
+      "integrity": "sha512-vC/lqNgSslQT3vSlNOpyT34ELK0eoNbA/rHUvTUjQemIiR1GpRMKhuwB21BqzWk+0MjZuJydGSCQMCebBge7jg==",
       "dev": true
     },
     "monaco-plugin-helpers": {
diff --git a/package.json b/package.json
index 3aaf369a..49160cbc 100644
--- a/package.json
+++ b/package.json
@@ -19,8 +19,8 @@
     "url": "https://github.com/Microsoft/monaco-css/issues"
   },
   "devDependencies": {
-    "monaco-editor-core": "0.16.0",
-    "monaco-languages": "1.7.0",
+    "monaco-editor-core": "0.18.1",
+    "monaco-languages": "1.8.0",
     "monaco-plugin-helpers": "^1.0.2",
     "requirejs": "^2.3.6",
     "typescript": "3.3.3333",
diff --git a/src/languageFeatures.ts b/src/languageFeatures.ts
index 2bfc87c0..891575b3 100644
--- a/src/languageFeatures.ts
+++ b/src/languageFeatures.ts
@@ -472,6 +472,7 @@ export class DocumentSymbolAdapter implements monaco.languages.DocumentSymbolPro
 				detail: '',
 				containerName: item.containerName,
 				kind: toSymbolKind(item.kind),
+				tags: [],
 				range: toRange(item.location.range),
 				selectionRange: toRange(item.location.range)
 			}));