diff --git a/.env.sample b/.env.sample
index 3527c0a..d7c410b 100644
--- a/.env.sample
+++ b/.env.sample
@@ -11,6 +11,7 @@ SECRET_RPC_SECRET_VERSION=v1 # length=32 charset=hex
 # supported and requires deleting the existing cluster layout metadata.
 REPLICATION_FACTOR=2
 
+DATABASE_ENGINE=lmdb
 CONSISTENCY_MODE=consistent
 METADATA_FSYNC=false
 DATA_FSYNC=false
@@ -27,4 +28,4 @@ BLOCK_SIZE=1MiB # only increase if there is a fast network connection between no
 #LOCAL_FOLDER_DATA=/path/on/docker/host
 
 ## Enable Full Data Backups (not just metadata)
-# COMPOSE_FILE="$COMPOSE_FILE:compose.fullbackup.yml"
\ No newline at end of file
+# COMPOSE_FILE="$COMPOSE_FILE:compose.fullbackup.yml"
diff --git a/abra.sh b/abra.sh
index 4c81e38..2287127 100644
--- a/abra.sh
+++ b/abra.sh
@@ -1 +1 @@
-export GARAGE_CONF_VERSION=v4
\ No newline at end of file
+export GARAGE_CONF_VERSION=v5
diff --git a/garage.toml.tmpl b/garage.toml.tmpl
index cfb3759..b6b5d4d 100644
--- a/garage.toml.tmpl
+++ b/garage.toml.tmpl
@@ -1,6 +1,6 @@
 metadata_dir = "/var/lib/garage/meta"
 data_dir = "/var/lib/garage/data"
-db_engine = "lmdb"
+db_engine = "{{ if env "DATABASE_ENGINE" }}{{ env "DATABASE_ENGINE" }}{{ else }}lmdb{{ end }}"
 metadata_auto_snapshot_interval = "6h"
 
 replication_factor = {{ env "REPLICATION_FACTOR" }}
@@ -26,4 +26,4 @@ bootstrap_peers = [
 [s3_api]
 s3_region = "garage"
 api_bind_addr = "[::]:3900"
-root_domain = ".s3.garage"
\ No newline at end of file
+root_domain = ".s3.garage"