diff --git a/.github/workflows/update-os.yml b/.github/workflows/update-os.yml
index 083f42b4..3e87435d 100644
--- a/.github/workflows/update-os.yml
+++ b/.github/workflows/update-os.yml
@@ -23,7 +23,7 @@ jobs:
         with:
           # Set the base_image to the desired Raspberry Pi OS version
           base_image: https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2023-05-03/2023-05-03-raspios-bullseye-armhf-lite.img.xz
-          image_additional_mb: 1750 # enlarge free space to 1.5 GB
+          image_additional_mb: 2000 # enlarge free space to 2 GB
           optimize_image: true
           user: inky
           commands: |
@@ -49,7 +49,8 @@ jobs:
             pip install RPi.GPIO==0.7.1 spidev==3.5
             cd inkycal/tests
             wget https://raw.githubusercontent.com/aceinnolab/Inkycal/assets/tests/settings.json
-            for f in *.py; do python3 "$f"; done
+            pip install pytest
+            python -m pytest
 
             # install deps for 12.48" display
             wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz