diff --git a/build.sh b/build.sh
index 1f53cb0..68f1098 100755
--- a/build.sh
+++ b/build.sh
@@ -5,15 +5,16 @@ set -e
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 SRC="$DIR/git"
 DST="$DIR/dist"
+if [ -z "$1" ]; then REF="master"; else REF="$1"; fi
 
 # Clone bitwarden_rs
-if [ -d "$SRC" ]; then
-  cd "$SRC" || exit
-  git pull
-  cd - || exit
-else
+if [ ! -d "$SRC" ]; then
   git clone https://github.com/dani-garcia/bitwarden_rs.git "$SRC"
 fi
+cd "$SRC" || exit
+git fetch
+git checkout "$REF"
+cd - || exit
 
 # Prepare EnvFile
 CONFIG="$DIR/debian/config.env"
@@ -26,5 +27,5 @@ mkdir -p "$DST"
 docker build -t bitwarden-deb "$DIR"
 
 CID=$(docker run -d bitwarden-deb)
-docker cp "$CID":/bitwarden_package/bitwarden-rs.deb "$DST"
+docker cp "$CID":/bitwarden_package/bitwarden-rs.deb "$DST/bitwarden_rs-$REF.deb"
 docker rm "$CID"