diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index 4271670..c5aeb5a 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.7, 3.8]
+        python-version: ["3.7", "3.8", "3.9"]  # "3.10" wait for Open3D support
     env:
       DISPLAY: ':99.0'
 
@@ -34,7 +34,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest
+        pip install flake8
         pip install .[tests]
 
     - name: Test with pytest
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index ee0832f..d7ffb7a 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -7,22 +7,22 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]  # macos-latest, 
-        python-version: [3.7, 3.8]
+        os: [ubuntu-latest, windows-latest]  # macos-latest has OpenGL import error
+        python-version: ["3.7", "3.8", "3.9"]  # "3.10" wait for Open3D support
 
     steps:
     - name: Get repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
-    - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
       with:
         python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
-        pip install flake8 pytest
+        python -m pip install --upgrade pip setuptools wheel
+        pip install flake8
         pip install .[tests]
 
     - name: Lint with flake8
diff --git a/labelCloud/__init__.py b/labelCloud/__init__.py
index ab55bb1..aed5734 100644
--- a/labelCloud/__init__.py
+++ b/labelCloud/__init__.py
@@ -1 +1 @@
-__version__ = "0.7.5"
+__version__ = "0.7.6"
diff --git a/labelCloud/control/pcd_manager.py b/labelCloud/control/pcd_manager.py
index a22d190..dcda7b5 100644
--- a/labelCloud/control/pcd_manager.py
+++ b/labelCloud/control/pcd_manager.py
@@ -7,10 +7,9 @@
 from shutil import copyfile
 from typing import TYPE_CHECKING, List, Optional, Tuple
 
-import pkg_resources
-
 import numpy as np
 import open3d as o3d
+import pkg_resources
 
 from ..io.pointclouds import BasePointCloudHandler, Open3DHandler
 from ..model import BBox, Perspective, PointCloud
@@ -97,7 +96,9 @@ def get_next_pcd(self) -> None:
             self.current_id += 1
             self.save_current_perspective()
             self.pointcloud = PointCloud.from_file(
-                self.pcd_path, self.saved_perspective
+                self.pcd_path,
+                self.saved_perspective,
+                write_buffer=self.pointcloud is not None,
             )
             self.update_pcd_infos()
         else:
diff --git a/labelCloud/model/point_cloud.py b/labelCloud/model/point_cloud.py
index 51518c6..88cfe35 100644
--- a/labelCloud/model/point_cloud.py
+++ b/labelCloud/model/point_cloud.py
@@ -3,10 +3,9 @@
 from pathlib import Path
 from typing import List, Optional, Tuple
 
-import pkg_resources
-
 import numpy as np
 import OpenGL.GL as GL
+import pkg_resources
 
 from . import Perspective
 from ..control.config_manager import config
@@ -65,6 +64,7 @@ def __init__(
         colors: Optional[np.ndarray] = None,
         init_translation: Optional[Tuple[float, float, float]] = None,
         init_rotation: Optional[Tuple[float, float, float]] = None,
+        write_buffer: bool = True,
     ) -> None:
         start_section(f"Loading {path.name}")
         self.path = path
@@ -89,14 +89,17 @@ def __init__(
             )
             logging.info("Generated colors for colorless point cloud based on height.")
 
-        self.write_vbo()
+        if write_buffer:
+            self.write_vbo()
 
         logging.info(green(f"Successfully loaded point cloud from {path}!"))
         self.print_details()
         end_section()
 
     @classmethod
-    def from_file(cls, path: Path, perspective: Optional[Perspective]) -> "PointCloud":
+    def from_file(
+        cls, path: Path, perspective: Optional[Perspective], write_buffer: bool = True
+    ) -> "PointCloud":
         init_translation, init_rotation = (None, None)
         if perspective:
             init_translation = perspective.translation
@@ -105,7 +108,7 @@ def from_file(cls, path: Path, perspective: Optional[Perspective]) -> "PointClou
         points, colors = BasePointCloudHandler.get_handler(
             path.suffix
         ).read_point_cloud(path=path)
-        return cls(path, points, colors, init_translation, init_rotation)
+        return cls(path, points, colors, init_translation, init_rotation, write_buffer)
 
     def to_file(self, path: Optional[Path] = None) -> None:
         if not path:
diff --git a/requirements.txt b/requirements.txt
index 2f3ddbd..ef159e7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,5 @@ numpy~=1.21.4
 open3d~=0.14.1
 PyOpenGL~=3.1.5
 PyQt5~=5.14.1
+pytest~=7.1.1
+pytest-qt~=4.0.2
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index 1765c3a..3f116a1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = labelCloud
-version = attr: labelCloud.__version__
+version = attr: labelCloud.__init__.__version__
 maintainer = Christoph Sager
 maintainer_email = christoph.sager@gmail.com
 license = GNU General Public License v3.0
@@ -52,8 +52,7 @@ install_requires =
     numpy
     open3d
     PyOpenGL
-    PyQt5 <= 5.14.1;platform_system=='Windows'
-    PyQt5;platform_system!='Windows'
+    PyQt5
 python_requires = >=3.6
 
 [options.entry_points]