diff --git a/.env.sample b/.env.sample
index 60e13e2..afce32b 100644
--- a/.env.sample
+++ b/.env.sample
@@ -14,17 +14,16 @@ APP_DOCKER_IMAGE=bonfirenetworks/bonfire:latest-${FLAVOUR}-amd64
 # multi-arch image (built by CI, but currently not working): 
 #APP_DOCKER_IMAGE=bonfirenetworks/bonfire:latest-${FLAVOUR}
 
+DB_DOCKER_VERSION=16-3.4
 # note that different flavours or architectures may require different postgres builds:
 # For ARM or x86:
-DB_DOCKER_IMAGE=ghcr.io/baosystems/postgis:12-3.4
-# DB_DOCKER_IMAGE=ghcr.io/baosystems/postgis:15-3.4
+DB_DOCKER_IMAGE=ghcr.io/baosystems/postgis:${DB_DOCKER_VERSION}
 # for x86:
-# DB_DOCKER_IMAGE=postgis/postgis:12-3.4-alpine
-# DB_DOCKER_IMAGE=postgis/postgis:15-3.4-alpine
+# DB_DOCKER_IMAGE=postgis/postgis:${DB_DOCKER_VERSION}-alpine
 # multiarch (but doesn't have required Postgis extension)
-#DB_DOCKER_IMAGE=postgres:12-alpine
-# TODO: maybe to use for Upgrading to a new Postgres version (NOTE: does not work with postgis data)
-# DB_DOCKER_IMAGE=pgautoupgrade/pgautoupgrade:15-alpine
+#DB_DOCKER_IMAGE=postgres:${DB_DOCKER_VERSION}-alpine
+# TODO: maybe to use for Upgrading to a new Postgres version? (NOTE: does not work with postgis data)
+# DB_DOCKER_IMAGE=pgautoupgrade/pgautoupgrade:16-alpine
 
 
 # enter your instance's domain name