diff --git a/.env.sample b/.env.sample
index c7634d7..f20d578 100644
--- a/.env.sample
+++ b/.env.sample
@@ -14,7 +14,7 @@ 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
+DB_DOCKER_VERSION=17-3.5
 # note that different flavours or architectures may require different postgres builds:
 # For ARM or x86:
 DB_DOCKER_IMAGE=ghcr.io/baosystems/postgis:${DB_DOCKER_VERSION}