diff --git a/build.sh b/build.sh
index 51e4c51..8fee13a 100755
--- a/build.sh
+++ b/build.sh
@@ -1,18 +1,23 @@
-#!/bin/sh
+#!/bin/bash
 
 set -eu
 
-VERSION=$1
+RELEASES="$(curl -s https://api.github.com/repos/M66B/FairEmail/releases)"
 
-APK_FILENAME=FairEmail-v$VERSION-full-github.apk
+# FIXME Test whether asset name matches "full-github"
+LATEST_GITHUB_RELEASE=$(echo $RELEASES | jq '[.[] | select(.assets | length > 0)] | first')
+if [ "$LATEST_GITHUB_RELEASE" == null ]; then
+    echo "No github release available"
+    exit 1
+fi
+
+VERSION=$(echo $LATEST_GITHUB_RELEASE | jq -r '.tag_name')
+APK_FILENAME=$(echo $LATEST_GITHUB_RELEASE | jq -r '.assets[0].name')
 
-set +e
-rsync sillywalk.de:/srv/www/sillywalk.de/root/releases/$APK_FILENAME
-if [ $? -eq 0 ]; then
-    echo "$VERSION already released. Aborting."
+if rsync sillywalk.de:/srv/www/sillywalk.de/root/releases/$APK_FILENAME; then
+    echo "$APK_FILENAME already released. Aborting."
     exit 1
 fi
-set -e
 
 docker build \
     --build-arg VERSION=$VERSION \