diff --git a/.github/workflows/update-os.yml b/.github/workflows/update-os.yml
index 2672458..ca9872a 100644
--- a/.github/workflows/update-os.yml
+++ b/.github/workflows/update-os.yml
@@ -24,7 +24,7 @@ jobs:
           TINDIE_USERNAME: ${{ secrets.TINDIE_USERNAME }}
         with:
           # Set the base_image to the desired Raspberry Pi OS version
-          base_image: https://downloads.raspberrypi.com/raspios_lite_armhf/images/raspios_lite_armhf-2024-03-15/2024-03-15-raspios-bookworm-armhf-lite.img.xz
+          base_image: https://downloads.raspberrypi.com/raspios_oldstable_lite_armhf/images/raspios_oldstable_lite_armhf-2024-07-04/2024-07-04-raspios-bullseye-armhf-lite.img.xz
           image_additional_mb: 3072 # enlarge free space to 3 GB
           optimize_image: true
           commands: |