diff --git a/bitnami/postgresql/15/debian-11/Dockerfile b/bitnami/postgresql/15/debian-11/Dockerfile
index 391bbbde0f63..0c0ca6f494bd 100644
--- a/bitnami/postgresql/15/debian-11/Dockerfile
+++ b/bitnami/postgresql/15/debian-11/Dockerfile
@@ -9,10 +9,10 @@ ARG WITH_ALL_LOCALES="no"
 
 LABEL com.vmware.cp.artifact.flavor="sha256:1e1b4657a77f0d47e9220f0c37b9bf7802581b93214fff7d1bd2364c8bf22e8e" \
       org.opencontainers.image.base.name="docker.io/bitnami/minideb:bullseye" \
-      org.opencontainers.image.created="2023-09-15T20:50:55Z" \
+      org.opencontainers.image.created="2023-09-19T12:34:32Z" \
       org.opencontainers.image.description="Application packaged by VMware, Inc" \
       org.opencontainers.image.licenses="Apache-2.0" \
-      org.opencontainers.image.ref.name="15.4.0-debian-11-r34" \
+      org.opencontainers.image.ref.name="15.4.0-debian-11-r38" \
       org.opencontainers.image.title="postgresql" \
       org.opencontainers.image.vendor="VMware, Inc." \
       org.opencontainers.image.version="15.4.0"
diff --git a/bitnami/postgresql/README.md b/bitnami/postgresql/README.md
index d53b6ab8b99c..51184dbfb487 100644
--- a/bitnami/postgresql/README.md
+++ b/bitnami/postgresql/README.md
@@ -181,14 +181,6 @@ Passing extra command-line flags to the postgresql service command is possible t
 
 * `POSTGRESQL_EXTRA_FLAGS`: Flags to be appended to the `postgres` startup command. No defaults
 
-#### Adjusting the default transaction isolation level
-
-The default transaction isolation level in postgresql is `read committed`, the global default transaction isolation level can be changed using the environment variable `POSTGRESQL_DEFAULT_TRANSACTION_ISOLATION`.
-
-Possible values are: `read uncommitted`, `read committed`, `repeatable read` or `serializable`. For more details consult the documentation for `default_transaction_isolation` in <https://www.postgresql.org/docs/current/runtime-config-client.html>
-
-*Note: Setting `default_transaction_isolation` via `POSTGRESQL_EXTRA_FLAGS` is currently only possible for transaction levels without white spaces in its name.*
-
 ### Initializing a new instance
 
 When the container is executed for the first time, it will execute the files with extensions `.sh`, `.sql` and `.sql.gz` located at `/docker-entrypoint-initdb.d`.