diff --git a/docker-compose-examples/grist-local-testing/docker-compose.yml b/docker-compose-examples/grist-local-testing/docker-compose.yml
index f71af756..4e1642af 100644
--- a/docker-compose-examples/grist-local-testing/docker-compose.yml
+++ b/docker-compose-examples/grist-local-testing/docker-compose.yml
@@ -1,11 +1,8 @@
 services:
   grist:
     image: gristlabs/grist:latest
-    environment:
-      # Use Python 3 instead of 2.
-      PYTHON_VERSION: 3
     volumes:
       # Where to store persistent data, such as documents.
-      - ./grist_local_data:/persist
+      - ${GRIST_DATA_DIR:-./grist_local_data}:/persist
     ports:
       - 8484:8484
diff --git a/docker-compose-examples/grist-traefik-basic-auth/docker-compose.yml b/docker-compose-examples/grist-traefik-basic-auth/docker-compose.yml
index fe12d4b6..2a0cf8d2 100644
--- a/docker-compose-examples/grist-traefik-basic-auth/docker-compose.yml
+++ b/docker-compose-examples/grist-traefik-basic-auth/docker-compose.yml
@@ -1,5 +1,3 @@
-
-
 services:
   grist:
     image: gristlabs/grist:latest
diff --git a/docker-compose-examples/grist-with-postgres-redis-minio/docker-compose.yml b/docker-compose-examples/grist-with-postgres-redis-minio/docker-compose.yml
index cc7f7d7c..91aca973 100644
--- a/docker-compose-examples/grist-with-postgres-redis-minio/docker-compose.yml
+++ b/docker-compose-examples/grist-with-postgres-redis-minio/docker-compose.yml
@@ -1,12 +1,7 @@
-
-
 services:
   grist:
     image: gristlabs/grist:latest
     environment:
-      # Use Python 3 instead of 2.
-      PYTHON_VERSION: 3
-
       # Postgres database setup
       TYPEORM_DATABASE: grist
       TYPEORM_USERNAME: grist