diff --git a/download-image.sh b/download-image.sh
index 05f1e92..1af0dd7 100755
--- a/download-image.sh
+++ b/download-image.sh
@@ -5,9 +5,9 @@
 TARGET=${1:-raspbian.zip}
 # Note: if updating the image we're using, you should also update the hash
 # below. The hashes are available from Raspberry Pi as "$IMAGE.sha256".
-IMAGE=https://downloads.raspberrypi.org/raspbian_lite/images/raspbian_lite-2017-12-01/2017-11-29-raspbian-stretch-lite.zip
+IMAGE=https://downloads.raspberrypi.org/raspbian_lite/images/raspbian_lite-2019-06-24/2019-06-20-raspbian-buster-lite.zip
 
-echo "e942b70072f2e83c446b9de6f202eb8f9692c06e7d92c343361340cc016e0c9f $TARGET" > sha256
+echo "9009409a9f969b117602d85d992d90563f181a904bc3812bdd880fc493185234 $TARGET" > sha256
 
 # If we already have the file, and it's got the right hash, then skip the download
 sha256sum --check sha256 && echo "Image already downloaded." && exit 0
diff --git a/pi-prebuild.sh b/pi-prebuild.sh
index a99ef9b..bfd647b 100755
--- a/pi-prebuild.sh
+++ b/pi-prebuild.sh
@@ -8,9 +8,6 @@ uname -a
 export DEBIAN_FRONTEND=noninteractive
 export APT_LISTCHANGES_FRONTEND=none
 
-echo "Adding backports"
-echo "deb [trusted=yes] http://ftp.debian.org/debian stretch-backports main" >> /etc/apt/sources.list
-
 echo "Updating apt"
 apt-get --quiet update -y
 
@@ -30,7 +27,8 @@ apt-get --quiet install -y \
     libopencv-contrib-dev \
     libopencv-video-dev \
     libopencv-photo-dev \
-    python3-dev
+    python3-dev \
+    python3-cffi
 
 echo "Install some useful tools for debugging"
 apt-get --quiet install -y \
@@ -40,9 +38,6 @@ apt-get --quiet install -y \
     screen \
     vim
 
-echo "Installing bits and pieces from backports"
-apt-get --quiet -t stretch install -y python3-cffi
-
 echo "Rebuilding locale"
 echo "en_GB.UTF-8 UTF-8" > /etc/locale.gen
 echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen