diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 87c235d8f..65e7192b8 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -35,26 +35,35 @@ jobs:
         miniforge-variant: Miniforge3
         miniforge-version: latest
         activate-environment: pydm-env
-    - name: Install python packages
+
+    - name: Install PyDM with Mamba
+      shell: bash -el {0}
+      run: |
+        mamba install -c conda-forge pydm pyqt=${{ matrix.pyqt-version }}
+
+    - name: Install additional Python dependencies with pip
       shell: bash -el {0}
       run: |
+        pip install -r requirements.txt
         if [ "$RUNNER_OS" == "Windows" ]; then
-          mamba install pyqt=${{ matrix.pyqt-version }}
-          mamba install --file requirements.txt --file windows-dev-requirements.txt
+          pip install -r windows-dev-requirements.txt
         else
-          mamba install pyqt=${{ matrix.pyqt-version }} $(cat requirements.txt dev-requirements.txt)
+          pip install -r dev-requirements.txt
         fi
-    - name: Install packages for testing a pyqt app on linux
+
+    - name: Install packages for testing a PyQt app on Linux
       shell: bash -el {0}
       run: |
         if [ "$RUNNER_OS" == "Linux" ]; then
-          sudo apt install xvfb herbstluftwm libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xfixes0 x11-utils
+          sudo apt update
+          sudo apt install -y xvfb herbstluftwm libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xfixes0 x11-utils
           sudo /sbin/start-stop-daemon --start --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -screen 0 1024x768x24 -ac +extension GLX +render -noreset
           sleep 3
           sudo /sbin/start-stop-daemon --start --pidfile /tmp/custom_herbstluftwm_99.pid --make-pidfile --background --exec /usr/bin/herbstluftwm
           sleep 1
         fi
+
     - name: Test with pytest
       shell: bash -el {0}
       run: |
-        python run_tests.py
+        python run_tests.py
\ No newline at end of file