diff --git a/README.md b/README.md
index d964166..d53d0be 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ services:
             - POSTGRES_USER=username
             - POSTGRES_PASSWORD=password
          #  - POSTGRES_PASSWORD_FILE=/run/secrets/db_password <-- alternative for POSTGRES_PASSWORD (to use with docker secrets)
-            - POSTGRES_EXTRA_OPTS=-Z9 --schema=public --blobs
+            - POSTGRES_EXTRA_OPTS=-Z6 --schema=public --blobs
             - SCHEDULE=@daily
             - BACKUP_KEEP_DAYS=7
             - BACKUP_KEEP_WEEKS=4
@@ -76,7 +76,7 @@ Most variables are the same as in the [official postgres image](https://hub.dock
 | HEALTHCHECK_PORT | Port listening for cron-schedule health check. Defaults to `8080`. |
 | POSTGRES_DB | Comma or space separated list of postgres databases to backup. Required. |
 | POSTGRES_DB_FILE | Alternative to POSTGRES_DB, but with one database per line, for usage with docker secrets. |
-| POSTGRES_EXTRA_OPTS | Additional [options](https://www.postgresql.org/docs/12/app-pgdump.html#PG-DUMP-OPTIONS) for `pg_dump` (or `pg_dumpall` [options](https://www.postgresql.org/docs/12/app-pg-dumpall.html#id-1.9.4.13.6) if POSTGRES_CLUSTER is set). Defaults to `-Z9`. |
+| POSTGRES_EXTRA_OPTS | Additional [options](https://www.postgresql.org/docs/12/app-pgdump.html#PG-DUMP-OPTIONS) for `pg_dump` (or `pg_dumpall` [options](https://www.postgresql.org/docs/12/app-pg-dumpall.html#id-1.9.4.13.6) if POSTGRES_CLUSTER is set). Defaults to `-Z6`. |
 | POSTGRES_CLUSTER | Set to `TRUE` in order to use `pg_dumpall` instead. Also set POSTGRES_EXTRA_OPTS to any value or empty since the default value is not compatible with `pg_dumpall`. |
 | POSTGRES_HOST | Postgres connection parameter; postgres host to connect to. Required. |
 | POSTGRES_PASSWORD | Postgres connection parameter; postgres password to connect with. Required. |
diff --git a/alpine.Dockerfile b/alpine.Dockerfile
index a79900d..d590320 100644
--- a/alpine.Dockerfile
+++ b/alpine.Dockerfile
@@ -19,7 +19,7 @@ ENV POSTGRES_DB="**None**" \
     POSTGRES_PASSWORD="**None**" \
     POSTGRES_PASSWORD_FILE="**None**" \
     POSTGRES_PASSFILE_STORE="**None**" \
-    POSTGRES_EXTRA_OPTS="-Z9" \
+    POSTGRES_EXTRA_OPTS="-Z6" \
     POSTGRES_CLUSTER="FALSE" \
     SCHEDULE="@daily" \
     BACKUP_DIR="/backups" \
diff --git a/backup.sh b/backup.sh
index 4811b78..ca62868 100755
--- a/backup.sh
+++ b/backup.sh
@@ -72,7 +72,7 @@ for DB in ${POSTGRES_DBS}; do
   #Create dump
   if [ "${POSTGRES_CLUSTER}" = "TRUE" ]; then
     echo "Creating cluster dump of ${DB} database from ${POSTGRES_HOST}..."
-    pg_dumpall -l "${DB}" ${POSTGRES_EXTRA_OPTS} | gzip -9 > "${DFILE}"
+    pg_dumpall -l "${DB}" ${POSTGRES_EXTRA_OPTS} | gzip > "${DFILE}"
   else
     echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."
     pg_dump -d "${DB}" -f "${DFILE}" ${POSTGRES_EXTRA_OPTS}
diff --git a/debian.Dockerfile b/debian.Dockerfile
index 04a87e1..c4f395d 100644
--- a/debian.Dockerfile
+++ b/debian.Dockerfile
@@ -19,7 +19,7 @@ ENV POSTGRES_DB="**None**" \
     POSTGRES_PASSWORD="**None**" \
     POSTGRES_PASSWORD_FILE="**None**" \
     POSTGRES_PASSFILE_STORE="**None**" \
-    POSTGRES_EXTRA_OPTS="-Z9" \
+    POSTGRES_EXTRA_OPTS="-Z6" \
     POSTGRES_CLUSTER="FALSE" \
     SCHEDULE="@daily" \
     BACKUP_DIR="/backups" \