diff --git a/.github/workflows/upload_release.yml b/.github/workflows/upload_release.yml
index 863a8bb47..b0188225e 100644
--- a/.github/workflows/upload_release.yml
+++ b/.github/workflows/upload_release.yml
@@ -6,9 +6,16 @@ name: upload
 # Controls when the action will run.
 on:
   # Allows you to run this workflow manually from the Actions tab
-  push:
-    branches:
-      - master
+  workflow_dispatch:
+    inputs:
+      upload_server:
+        description: 'upload server'
+        required: true
+        default: 'testpypi'
+        type: choice
+        options:
+          - 'testpypi'
+          - 'pypi'
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
@@ -31,10 +38,23 @@ jobs:
           # Upgrade pip
           python3 -m pip install --upgrade pip
           # Install twine
-          python3 -m pip install setuptools wheel twine
+          python3 -m pip install build setuptools wheel twine
+
+      # Upload to TestPyPI
+      - name: Build and Upload to TestPyPI
+        if: ${{ inputs.upload_server == 'testpypi' }}
+        run: |
+          python3 -m build
+          python3 -m twine check dist/* --strict
+          python3 -m twine upload dist/*
+        env:
+          TWINE_USERNAME: __token__
+          TWINE_PASSWORD: ${{ secrets.TESTPYPI }}
+          TWINE_REPOSITORY: testpypi
 
       # Upload to PyPI
       - name: Build and Upload to PyPI
+        if: ${{ inputs.upload_server == 'pypi' }}
         run: |
           python3 -m build
           python3 -m twine check dist/* --strict 
@@ -59,7 +79,7 @@ jobs:
           ref_name: develop
 
 
-      # Run an install for testing
+      # Run an installation for testing
       - name: Install pandapower from PyPI
         run: |
           python3 -m pip install pandapower
diff --git a/pandapower/_version.py b/pandapower/_version.py
index a3a3d8636..8ea6e701a 100644
--- a/pandapower/_version.py
+++ b/pandapower/_version.py
@@ -1,4 +1,4 @@
 import importlib.metadata
 
 __version__ = importlib.metadata.version("pandapower")
-__format_version__ = "3.0.0"
+__format_version__ = "3.0.0.dev0"
diff --git a/pyproject.toml b/pyproject.toml
index 0851e7cd6..5d19789f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pandapower"
-version = "3.0.0" # File format version '__format_version__' is tracked in _version.py
+version = "3.0.0.dev0" # File format version '__format_version__' is tracked in _version.py
 authors = [
     { name = "Leon Thurner", email = "leon.thurner@retoflow.de" },
     { name = "Alexander Scheidler", email = "alexander.scheidler@iee.fraunhofer.de" }