diff --git a/ansible/files/.env b/ansible/files/.env
index a985705..0656cba 100644
--- a/ansible/files/.env
+++ b/ansible/files/.env
@@ -6,8 +6,9 @@ SQLALCHEMY_DATABASE_URI=postgresql+psycopg://postgres:123456@postgres:5432/petty
 MODULE_NAME=barker.main
 PROJECT_NAME=barker
 MAX_WORKERS=4
-NATS_HOST=nats
-NATS_PORT=4222
+NATS_URL=nats://{{ nats_host }}:{{ nats_port }}
+SUBJECT="barker.print"
+STREAM="barker_print_stream"
 SECRET_KEY={{ secret_key }}
 MIDDLEWARE_SECRET_KEY={{ middleware_key }}
 ALGORITHM=HS256
diff --git a/ansible/files/frank.env b/ansible/files/frank.env
index 59ddd5e..2341f1a 100644
--- a/ansible/files/frank.env
+++ b/ansible/files/frank.env
@@ -1,3 +1,5 @@
-NATS_HOST=localhost
-NATS_PORT=4222
-QUEUE_NAME={{ queue_name }}
+NATS_URL=nats://localhost:4222
+DURABLE={{ queue_name }}
+SUBJECT="barker.print"
+STREAM="barker_print_stream"
+ADDRESS={{ printer_port }}
diff --git a/version_bump.sh b/version_bump.sh
index 4eb4d53..0321b8c 100755
--- a/version_bump.sh
+++ b/version_bump.sh
@@ -3,6 +3,12 @@ set -euo pipefail
 parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
 cd "$parent_path" || exit
 
+last_commit_subject=$(git log -1 --format=%s)
+if [[ "$last_commit_subject" =~ ^Version\ Bump ]]; then
+  echo "Last commit is already a version bump (\"$last_commit_subject\"). Nothing to do."
+  exit 0
+fi
+
 if [ 1 -eq "$#" ]
 then
   current_version=$(grep -m 1 '^version = ' barker/pyproject.toml | sed -E 's/version = "([^"]+)"/\1/')