diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 1151b4c..471a23b 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
       - uses: actions/checkout@v3
@@ -24,9 +24,15 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          pip install flake8 pytest
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
           if [ -f test-requirements.txt ]; then pip install -r test-requirements.txt; fi
-
-      - name: Run unittests
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      - name: Test with pytest
         run: |
-          python3 -m unittest
+          pytest
diff --git a/custom/config.json b/custom/config.json
index 851c092..cfea019 100644
--- a/custom/config.json
+++ b/custom/config.json
@@ -2,5 +2,5 @@
    "packageName": "pfruck_contabo",
    "projectName": "pfruck_contabo",
    "packageUrl": "https://github.com/p-fruck/python-contabo",
-   "packageVersion": "1.12.0"
+   "packageVersion": "2.0.0"
 }
diff --git a/pfruck_contabo/__init__.py b/pfruck_contabo/__init__.py
index 60cdea6..f77f514 100644
--- a/pfruck_contabo/__init__.py
+++ b/pfruck_contabo/__init__.py
@@ -14,7 +14,7 @@
 """  # noqa: E501
 
 
-__version__ = "1.12.0"
+__version__ = "2.0.0"
 
 # import apis into sdk package
 from pfruck_contabo.api.images_api import ImagesApi
diff --git a/pfruck_contabo/api_client.py b/pfruck_contabo/api_client.py
index 39a0b45..257d501 100644
--- a/pfruck_contabo/api_client.py
+++ b/pfruck_contabo/api_client.py
@@ -88,7 +88,7 @@ def __init__(
             self.default_headers[header_name] = header_value
         self.cookie = cookie
         # Set default User-Agent.
-        self.user_agent = 'OpenAPI-Generator/1.12.0/python'
+        self.user_agent = 'OpenAPI-Generator/2.0.0/python'
         self.client_side_validation = configuration.client_side_validation
 
     def __enter__(self):
diff --git a/pfruck_contabo/configuration.py b/pfruck_contabo/configuration.py
index ea04835..605967a 100644
--- a/pfruck_contabo/configuration.py
+++ b/pfruck_contabo/configuration.py
@@ -379,7 +379,7 @@ def to_debug_report(self):
                "OS: {env}\n"\
                "Python Version: {pyversion}\n"\
                "Version of the API: 1.0.0\n"\
-               "SDK Package Version: 1.12.0".\
+               "SDK Package Version: 2.0.0".\
                format(env=sys.platform, pyversion=sys.version)
 
     def get_host_settings(self):
diff --git a/pyproject.toml b/pyproject.toml
index d26cf8a..168badd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pfruck_contabo"
-version = "1.12.0"
+version = "2.0.0"
 description = "Contabo API"
 authors = ["OpenAPI Generator Community <support@contabo.com>"]
 license = "NoLicense"
diff --git a/setup.py b/setup.py
index 958b7a9..49cc89d 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@
 # prerequisite: setuptools
 # http://pypi.python.org/pypi/setuptools
 NAME = "pfruck_contabo"
-VERSION = "1.12.0"
+VERSION = "2.0.0"
 PYTHON_REQUIRES = ">=3.7"
 REQUIRES = [
     "urllib3 >= 1.25.3, < 2.1.0",