diff --git a/.github/workflows/verify-build.yml b/.github/workflows/verify-build.yml
new file mode 100644
index 0000000..8bca5b8
--- /dev/null
+++ b/.github/workflows/verify-build.yml
@@ -0,0 +1,28 @@
+name: Verify addons/ folder
+on:
+  # Run on any branch to support ghstack's synthetic base/head branches.
+  pull_request:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+jobs:
+  verify-addons:
+    runs-on: ubuntu-latest
+    container: 'ubuntu:22.04'
+    steps:
+      - name: apt update
+        run: apt-get -y update
+      - name: install Node.js
+        run: curl -fsSL https://deb.nodesource.com/setup_16.x | bash -
+      - name: install yarn
+        run: npm install -g yarn
+      - name: Checkout Code
+        uses: actions/checkout@v3
+      - name: Grant Access
+        run: git config --global --add safe.directory "$PWD"
+      - name: yarn install
+        run: yarn install
+      - name: build TypeScript
+        run: yarn run tsc --noEmit
diff --git a/package.json b/package.json
index 532a50e..60f7d0d 100644
--- a/package.json
+++ b/package.json
@@ -10,8 +10,8 @@
   },
   "dependencies": {
     "monaco-editor": "0.21.2",
-    "vscode-oniguruma": "1.3.0",
-    "vscode-textmate": "5.1.1"
+    "vscode-oniguruma": "^1.6.1",
+    "vscode-textmate": "^6.0.0"
   },
   "devDependencies": {
     "css-loader": "3.5.3",
diff --git a/src/providers.ts b/src/providers.ts
index e59ed77..c9b0de8 100644
--- a/src/providers.ts
+++ b/src/providers.ts
@@ -152,6 +152,8 @@ export class SimpleLanguageInfoProvider {
   }
 }
 
+const TOKENIZE_TIMEOUT_MS = 500;
+
 class TokensProviderCache {
   private scopeNameToGrammar: Map<string, Promise<IGrammar>> = new Map();
 
@@ -172,7 +174,17 @@ class TokensProviderCache {
         line: string,
         state: monaco.languages.IState,
       ): monaco.languages.IEncodedLineTokens {
-        const tokenizeLineResult2 = grammar.tokenizeLine2(line, state as StackElement);
+        const tokenizeLineResult2 = grammar.tokenizeLine2(
+          line,
+          state as StackElement,
+          TOKENIZE_TIMEOUT_MS,
+        );
+
+        // This is the strategy used by VS Code:
+        if (tokenizeLineResult2.stoppedEarly) {
+          return {tokens: tokenizeLineResult2.tokens, endState: state};
+        }
+
         const {tokens, ruleStack: endState} = tokenizeLineResult2;
         return {tokens, endState};
       },
diff --git a/yarn.lock b/yarn.lock
index 3eafd6f..cce3e81 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4085,15 +4085,15 @@ vm-browserify@^1.0.1:
   resolved "https://registry.yarnpkg.com/vm-browserify/-/vm-browserify-1.1.2.tgz#78641c488b8e6ca91a75f511e7a3b32a86e5dda0"
   integrity sha512-2ham8XPWTONajOR0ohOKOHXkm3+gaBmGut3SRuu75xLd/RRaY6vqgh8NBYYk7+RW3u5AtzPQZG8F10LHkl0lAQ==
 
-vscode-oniguruma@1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/vscode-oniguruma/-/vscode-oniguruma-1.3.0.tgz#6788a9db2f8b0781243b4eb8c7a1dd25f6c0e2c8"
-  integrity sha512-m4Br19v6XD4MRbVrgsLNSZgQrBzk1BCMCleL8+GrcoGxKEJJd62zOFcTaoQR3hCrSlLqoxWmJ7Cc0VieVV3iTQ==
+vscode-oniguruma@^1.6.1:
+  version "1.6.2"
+  resolved "https://registry.yarnpkg.com/vscode-oniguruma/-/vscode-oniguruma-1.6.2.tgz#aeb9771a2f1dbfc9083c8a7fdd9cccaa3f386607"
+  integrity sha512-KH8+KKov5eS/9WhofZR8M8dMHWN2gTxjMsG4jd04YhpbPR91fUj7rYQ2/XjeHCJWbg7X++ApRIU9NUwM2vTvLA==
 
-vscode-textmate@5.1.1:
-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/vscode-textmate/-/vscode-textmate-5.1.1.tgz#d88dbf271bee7cede455a21bd4894ba5724a4a7e"
-  integrity sha512-5VHjF+Fglf9d2JI5OyQ7FHutK6/29G0qYyD920K0SWO7uY8JTWbqyKAHEtfB/ZDk2fOe/E23n3wz9fHXKi63yg==
+vscode-textmate@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/vscode-textmate/-/vscode-textmate-6.0.0.tgz#a3777197235036814ac9a92451492f2748589210"
+  integrity sha512-gu73tuZfJgu+mvCSy4UZwd2JXykjK9zAZsfmDeut5dx/1a7FeTk0XwJsSuqQn+cuMCGVbIBfl+s53X4T19DnzQ==
 
 wasm-dce@^1.0.0:
   version "1.0.2"