diff --git a/.travis.yml b/.travis.yml
index 07802644a..dcc94822d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -80,5 +80,5 @@ after_success:
       echo "Creating AppImage..." &&
       tools/create_appimage.sh &&
       echo "Uploading snapshot..." &&
-      tools/upload_snapshot.sh OpenClonk-x86_64.AppImage ||
+      tools/upload_snapshot.sh OpenClonk-x86_64.AppImage OpenClonk-x86_64.AppImage.zsync ||
       echo "Snapshot creation has failed"
diff --git a/tools/create_appimage.sh b/tools/create_appimage.sh
index 4cad3c721..094ad2d49 100755
--- a/tools/create_appimage.sh
+++ b/tools/create_appimage.sh
@@ -7,6 +7,10 @@ error() {
 
 [[ -f CMakeCache.txt ]] || error "this does not look like a build directory"
 
+# Read current branch from the CMake-generated C4Version.h.
+branch=$(cpp -dM C4Version.h | awk '$2 == "C4REVISION_BRANCH" { print gensub("^\"|\"$", "", "g", $3) }')
+[[ -n $branch ]] || error "could not get branch name"
+
 DESTDIR=appdir cmake --build . --target install || error "install failed"
 
 linuxdeployqt=linuxdeployqt-continuous-x86_64.AppImage
@@ -18,5 +22,14 @@ fi
 
 export ARCH=$(uname -m)
 
-./$linuxdeployqt appdir/usr/share/applications/openclonk.desktop -appimage \
-	|| error "AppImage creation has failed"
+# We need to run appimagetool manually to be able to specify an update URL.
+coproc { exec stdbuf -oL ./$linuxdeployqt --appimage-mount; }
+trap "kill -SIGINT $COPROC_PID" EXIT
+read -r -u "${COPROC[0]}" mount_path
+PATH="$mount_path/usr/bin:$PATH"
+
+linuxdeployqt appdir/usr/share/applications/openclonk.desktop -bundle-non-qt-libs \
+	|| error "linuxdeployqt has failed"
+
+appimagetool appdir --verbose -n -u "zsync|https://releases.openclonk.org/snapshots/latest-$branch/OpenClonk-x86_64.AppImage.zsync" \
+	|| error "appimagetool has failed"
diff --git a/tools/upload_snapshot.sh b/tools/upload_snapshot.sh
index 227298375..8ba97f6ac 100755
--- a/tools/upload_snapshot.sh
+++ b/tools/upload_snapshot.sh
@@ -17,11 +17,13 @@ branch=$(git symbolic-ref --short HEAD)
 date=$(date --date="$(git show -s --format=%ci)" -u -Is | sed 's/+00:\?00$/Z/')
 [[ -n $date ]] || error "could not get commit date"
 
-file=${1:?no file to upload given}
 : ${OC_REL_URL:?target URL not set}
+(($# > 0)) || error "no files to upload given"
 
-upload_path="/snapshots/$date-$branch-$revision/$(basename "$file")"
-echo "uploading $upload_path"
+for file in "$@"; do
+	upload_path="/snapshots/$date-$branch-$revision/$(basename "$file")"
+	echo "uploading $upload_path"
 
-curl -XPOST "$OC_REL_URL$upload_path" --data-binary "@$file" \
-	|| error "file upload failed"
+	curl -XPOST "$OC_REL_URL$upload_path" --data-binary "@$file" \
+		|| error "file upload failed"
+done