diff --git a/.github/workflows/Test.yml b/.github/workflows/Test.yml
index 3d87cac2..2ff76ed3 100644
--- a/.github/workflows/Test.yml
+++ b/.github/workflows/Test.yml
@@ -73,7 +73,7 @@ jobs:
           verbose: true
           emoji: true
           job-summary: true
-          custom-arguments: '-v '
+          custom-arguments: '-v --ignore=./tests/test_FMIRegression.py'
           click-to-expand: true
           report-title: 'Test Report'
 
diff --git a/.github/workflows/Test_v4xx.yml b/.github/workflows/Test_v4xx.yml
new file mode 100644
index 00000000..64cc2bd9
--- /dev/null
+++ b/.github/workflows/Test_v4xx.yml
@@ -0,0 +1,73 @@
+name: Test-v4.x.x
+
+on:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
+    strategy:
+      matrix:
+        # test for:
+        # * oldest supported version
+        # * latest available Python version
+        python-version: ['3.10', '3.14']
+        # * Linux using ubuntu-latest
+        # * Windows using windows-latest
+        os: ['ubuntu-latest', 'windows-latest']
+        # * OM stable - latest stable version
+        # * OM nightly - latest nightly build
+        omc-version: ['stable', 'nightly']
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: 'x64'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip build setuptools wheel twine
+          pip install . pytest pytest-md pytest-emoji pre-commit
+
+      - name: Set timezone
+        uses: szenius/set-timezone@v2.0
+        with:
+          timezoneLinux: 'Europe/Berlin'
+
+      - name: Run pre-commit linters
+        run: 'pre-commit run --all-files'
+
+      - name: "Set up OpenModelica Compiler"
+        uses: OpenModelica/setup-openmodelica@v1.0.6
+        with:
+          version: ${{ matrix.omc-version }}
+          packages: |
+            omc
+          libraries: |
+            'Modelica 4.0.0'
+      - run: "omc --version"
+
+      - name: Pull OpenModelica docker image
+        if: runner.os != 'Windows'
+        run: docker pull openmodelica/openmodelica:v1.25.0-minimal
+
+      - name: Build wheel and sdist packages
+        run: python -m build --wheel --sdist --outdir dist
+
+      - name: Check twine
+        run: python -m twine check dist/*
+
+      - name: Run pytest
+        uses: pavelzw/pytest-action@v2
+        with:
+          verbose: true
+          emoji: true
+          job-summary: true
+          custom-arguments: '-v ./tests --ignore=./tests/test_FMIRegression.py'
+          click-to-expand: true
+          report-title: 'Test Report'