diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 15da07d8..87a373d4 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -33,10 +33,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - name: Use Node.js 16.x
+    - name: Use Node.js 20.x
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - run: npm ci
     - name: Build standalone apps
       run: npm run pkg
diff --git a/.github/workflows/on-release.yml b/.github/workflows/on-release.yml
index 899fea2c..b7182244 100644
--- a/.github/workflows/on-release.yml
+++ b/.github/workflows/on-release.yml
@@ -11,7 +11,7 @@ jobs:
         - uses: actions/checkout@v4
         - uses: actions/setup-node@v3
           with:
-            node-version: 16.x
+            node-version: 20.x
         - run: npm ci
         - name: Build standalone apps
           run: npm run pkg
diff --git a/TODO.md b/TODO.md
index a3ca5636..bea9f4ff 100644
--- a/TODO.md
+++ b/TODO.md
@@ -26,7 +26,7 @@
 [ ] ODEs in markdown/latex/ascii
 [ ] rxode (R)
 [ ] dat (DBSolve)
-[ ] ModelingToolkit (Julia)
+[x] ModelingToolkit (Julia)
 [ ] PGF and TikZ
 [x] Summary
 [ ] Berkley Madonna
@@ -36,7 +36,6 @@
 
 ## features
 
-- support `null` for properties: highlight
 - atStart to exports: Matlab, DBSolve
 - write reusable `Build` class
 - alternative solution to substitute "pkg": Node.js 21 https://nodejs.org/api/single-executable-applications.html