diff --git a/dev/update-grammar.js b/dev/update-grammar.mjs
similarity index 54%
rename from dev/update-grammar.js
rename to dev/update-grammar.mjs
index 98efd12bb..09b5c7be1 100644
--- a/dev/update-grammar.js
+++ b/dev/update-grammar.mjs
@@ -1,12 +1,18 @@
-const fs = require('fs')
-const path = require('path')
-const vel = require('vscode-extend-language')
+import fs from 'fs'
+import path from 'path'
+import {download, getCommitSha, expandConfigurationFile} from'vscode-extend-language'
 
-const syntaxDir = path.join(__dirname, '..', 'syntax')
+const syntaxDir = './syntax'
 
+/**
+ * Download a file from a specific branch on a repo
+ * @param {string} repo
+ * @param {string} file
+ * @param {string} version git branch to pull
+ */
 async function downloadFile(repo, file, version='main') {
     const url = 'https://raw.githubusercontent.com/' + repo + '/' + version + '/' + file
-    var content = await vel.download(url)
+    var content = await download(url)
     if (!content) {
         console.log('Cannot retrieve ', url)
         return
@@ -16,37 +22,50 @@ async function downloadFile(repo, file, version='main') {
     console.log('Updating', syntaxFilePath)
 }
 
-async function main() {
+async function updateGrammars() {
     const latexBasicsRepo = 'jlelong/vscode-latex-basics'
     const grammarFiles = [
+        'BibTeX-style.tmLanguage.json',
         'Bibtex.tmLanguage.json',
+        'DocTeX.tmLanguage.json',
+        'JLweave.tmLanguage.json',
         'LaTeX.tmLanguage.json',
+        'Pweave.tmLanguage.json',
+        'RSweave.tmLanguage.json',
         'TeX.tmLanguage.json',
         'cpp-grammar-bailout.tmLanguage.json',
         'markdown-latex-combined.tmLanguage.json'
     ]
 
-    const sha = await vel.getCommitSha(latexBasicsRepo)
+    const sha = await getCommitSha(latexBasicsRepo)
     if (sha) {
         console.log(`Update grammar files to ${latexBasicsRepo}@${sha}`)
     } else {
         console.log('Cannot read last commit information')
     }
     for (const file of grammarFiles) {
-        downloadFile(latexBasicsRepo, 'syntaxes/' + file)
+        void downloadFile(latexBasicsRepo, 'syntaxes/' + file)
     }
 
+}
+
+async function main() {
+
+    await updateGrammars()
     // The order of the files matters!
-    languageFiles = [
+    const languageFiles = [
+        'latex-language-configuration.json',
         'latex-cpp-embedded-language-configuration.json',
         'markdown-latex-combined-language-configuration.json',
-        'latex-language-configuration.json',
-        'latex3-language-configuration.json'
+        'latex3-language-configuration.json',
+        'bibtex-language-configuration.json',
+        'bibtex-style-language-configuration.json',
+        'doctex-language-configuration.json'
     ]
     for (const file of languageFiles) {
         console.log('Expanding', path.join(syntaxDir, file))
-        await vel.expandConfigurationFile(path.join(syntaxDir, 'src', file), path.join(syntaxDir, file))
+        await expandConfigurationFile(path.join(syntaxDir, 'src', file), path.join(syntaxDir, file))
     }
 }
 
-main()
+await main()
diff --git a/package-lock.json b/package-lock.json
index 34d90daaa..196b35068 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -45,7 +45,7 @@
         "rimraf": "5.0.5",
         "textmate-bailout": "1.1.0",
         "typescript": "5.3.3",
-        "vscode-extend-language": "0.1.2"
+        "vscode-extend-language": "^0.2.2"
       },
       "engines": {
         "vscode": "^1.74.0"
@@ -5748,10 +5748,13 @@
       }
     },
     "node_modules/vscode-extend-language": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/vscode-extend-language/-/vscode-extend-language-0.1.2.tgz",
-      "integrity": "sha512-Dy0mm9+Ox8ZlG1gpgLphRulwR3skL+qJoEF4dzQd4G+bfLKF+jkf8FVRo6FIItrWf6oyeZIZG6jE9mwY68su8g==",
-      "dev": true
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/vscode-extend-language/-/vscode-extend-language-0.2.2.tgz",
+      "integrity": "sha512-434sPq/bwXPrVeS7CJAuFUg9vEfW1WnjZUhADQ9baVUnyeOaTNpOKNauXJzw4xSdqb3Tk9yz1Wg44PWFv4/haw==",
+      "dev": true,
+      "engines": {
+        "node": ">=16"
+      }
     },
     "node_modules/webidl-conversions": {
       "version": "3.0.1",
diff --git a/package.json b/package.json
index bdb947ee9..475956738 100644
--- a/package.json
+++ b/package.json
@@ -2579,8 +2579,7 @@
     "test": "node ./out/test/runTest.js",
     "watch-src": "tsc -watch -p tsconfig.json",
     "watch-viewer": "tsc -watch -p viewer/tsconfig.json",
-    "build-grammar": "node ./dev/build-grammar.js",
-    "update-grammar": "node ./dev/update-grammar.js"
+    "update-grammar": "node ./dev/update-grammar.mjs"
   },
   "dependencies": {
     "cross-spawn": "7.0.3",
@@ -2619,6 +2618,6 @@
     "rimraf": "5.0.5",
     "textmate-bailout": "1.1.0",
     "typescript": "5.3.3",
-    "vscode-extend-language": "0.1.2"
+    "vscode-extend-language": "^0.2.2"
   }
 }
diff --git a/syntax/src/bibtex-language-configuration.json b/syntax/src/bibtex-language-configuration.json
new file mode 100644
index 000000000..9d05cae39
--- /dev/null
+++ b/syntax/src/bibtex-language-configuration.json
@@ -0,0 +1,3 @@
+{
+	"extends": "https://raw.githubusercontent.com/jlelong/vscode-latex-basics/main/languages/bibtex-language-configuration.json"
+}
diff --git a/syntax/src/bibtex-style-language-configuration.json b/syntax/src/bibtex-style-language-configuration.json
new file mode 100644
index 000000000..c0a81ab01
--- /dev/null
+++ b/syntax/src/bibtex-style-language-configuration.json
@@ -0,0 +1,3 @@
+{
+	"extends": "https://raw.githubusercontent.com/jlelong/vscode-latex-basics/main/languages/bibtex-style-language-configuration.json"
+}
diff --git a/syntax/src/doctex-language-configuration.json b/syntax/src/doctex-language-configuration.json
new file mode 100644
index 000000000..beea43f2a
--- /dev/null
+++ b/syntax/src/doctex-language-configuration.json
@@ -0,0 +1,3 @@
+{
+	"extends": "https://raw.githubusercontent.com/jlelong/vscode-latex-basics/main/languages/doctex-language-configuration.json"
+}
diff --git a/tsconfig.eslint.json b/tsconfig.eslint.json
index ffb4b388e..0fdbc64a3 100644
--- a/tsconfig.eslint.json
+++ b/tsconfig.eslint.json
@@ -4,8 +4,7 @@
       "src/**/*.ts",
       "test/**/*.ts",
       "dev/**/*.ts",
-      "dev/generate-bailout.js",
-      "dev/latex-md.js"
+      "dev/*.mjs"
     ],
     "compilerOptions": {
       "allowJs": true,