Deploy failure: template error while templating string

[copelco]

TASK [caktus.django-k8s : Create/update templates in Kubernetes] ***************
ok: [staging] => (item={'name': 'registry_secret.yaml.j2', 'state': 'absent'})
ok: [staging] => (item={'name': 'redis.yaml.j2', 'state': 'present'})
ok: [staging] => (item={'name': 'elasticsearch.yaml.j2', 'state': 'absent'})
ok: [staging] => (item={'name': 'memcached.yaml.j2', 'state': 'absent'})
fatal: [staging]: FAILED! => 
  msg: |-
    An unhandled exception occurred while running the lookup plugin 'template'. Error was a <class 'ansible.errors.AnsibleError'>, original message: template error while templating string: expected token 'end of statement block', got '+'. String: {#
    Anywhere we need to inject a non-scalar value, we use to_json instead of to_yaml because it:
    1) more reliably includes wrapping {}
    2) behaves identically on Python 2 and Python 3
    (and all JSON is valid YAML).
    #}

[copelco]

Upgrading Jinja seems to fix this:

-jinja2==2.11.2
+jinja2==3.0.3