Zappa: Updating a deployment fails at update_lambda_configuration

Updating a deployment fails at update_lambda_configuration due to a KeyError

Context

I’ve had no problems updating this deployment until today. Python version is 3.8.10.

Expected Behavior

Zappa should complete the update of the deployment successfully.

Actual Behavior

Zappa fails with the following output:

$ zappa update prod
Calling update for stage prod..
Downloading and installing dependencies..
 - pyyaml==5.4.1: Downloading
100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 662k/662k [00:00<00:00, 6.57MB/s]
Packaging project as zip.
Uploading tellya2-prod-1631583880.zip (21.9MiB)..
100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 23.0M/23.0M [00:04<00:00, 4.86MB/s]
Updating Lambda function code..
Updating Lambda function configuration..
Oh no! An error occurred! :(

==============

Traceback (most recent call last):
  File "/Users/mark/.virtualenvs/tellya2_project/lib/python3.8/site-packages/zappa/cli.py", line 3422, in handle
    sys.exit(cli.handle())
  File "/Users/mark/.virtualenvs/tellya2_project/lib/python3.8/site-packages/zappa/cli.py", line 588, in handle
    self.dispatch_command(self.command, stage)
  File "/Users/mark/.virtualenvs/tellya2_project/lib/python3.8/site-packages/zappa/cli.py", line 641, in dispatch_command
    self.update(
  File "/Users/mark/.virtualenvs/tellya2_project/lib/python3.8/site-packages/zappa/cli.py", line 1165, in update
    self.lambda_arn = self.zappa.update_lambda_configuration(
  File "/Users/mark/.virtualenvs/tellya2_project/lib/python3.8/site-packages/zappa/core.py", line 1395, in update_lambda_configuration
    if lambda_aws_config["PackageType"] != "Image":
KeyError: 'PackageType'

==============

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Possible Fix

None that I’m aware of.

Steps to Reproduce

Unfortunately this is a private code repository so I cannot provide any links.

Your Environment

• Zappa version used: 0.53.0
• Operating System and Python version: MacOS 11.5.1 - Python 3.8.10
• The output of pip freeze: argcomplete==1.12.3 asgiref==3.3.4 boto3==1.17.97 botocore==1.20.97 certifi==2021.5.30 cfn-flip==1.2.3 chardet==4.0.0 click==8.0.1 Django==3.2.4 django-appconf==1.0.4 django-compressor @ git+https://github.com/django-compressor/django-compressor.git@f533dc6dde9ed90626382d78f3eb37b84d848027 django-formtools==2.3 django-libsass==0.9 django-otp==1.0.6 django-phonenumber-field==5.2.0 django-storages==1.11.1 django-tenants==3.3.1 django-two-factor-auth==1.13.1 durationpy==0.5 future==0.18.2 hjson==3.0.2 idna==2.10 jmespath==0.10.0 kappa==0.6.0 libsass==0.21.0 pbr==5.6.0 pep517==0.10.0 phonenumbers==8.12.25 pip-tools==6.1.0 placebo==0.9.0 psycopg2==2.9.1 psycopg2-binary==2.9.1 PyJWT==1.7.1 python-dateutil==2.8.1 python-slugify==5.0.2 pytz==2021.1 PyYAML==5.4.1 qrcode==6.1 rcssmin==1.0.6 requests==2.25.1 rjsmin==1.1.0 s3transfer==0.4.2 six==1.15.0 sqlparse==0.4.1 stevedore==3.3.0 text-unidecode==1.3 toml==0.10.2 tqdm==4.61.1 troposphere==2.7.0 twilio==6.61.0 urllib3==1.26.5 Werkzeug==0.16.1 wsgi-request-logger==0.4.6 zappa==0.53.0 zappa-django-utils==0.4.1
• Your zappa_settings.json:

{
    "dev": {
        "aws_region": "ap-northeast-1",
        "django_settings": "config.settings.dev",
        "profile_name": "default",
        "project_name": "tellya2",
        "runtime": "python3.8",
        "s3_bucket": "tellya2-dev",
        "keep_warm": false,
        "vpc_config": {
            "SubnetIds": ["subnet-085938da970945e07"],
            "SecurityGroupIds": ["sg-0353477a152c17539"]
        },
        "layers": ["arn:aws:lambda:ap-northeast-1:898466741470:layer:psycopg2-py38:1"],
        "delete_local_zip": true,
        "exclude": ["static", "psycopg2", "*.pyc", "pip", "pip-tools", "setuptools", "*.dist-info", "*.so"],
        "events": [{
            "function": "tellya2.lambda_functions.check_messages", 
            "expression": "rate(1 minute)"
        }]
    },
    "prod": {
        "aws_region": "ap-northeast-1",
        "django_settings": "config.settings.prod",
        "profile_name": "default",
        "project_name": "tellya2",
        "runtime": "python3.8",
        "s3_bucket": "tellya2-prod",
        "keep_warm": true,
        "vpc_config": {
            "SubnetIds": ["subnet-0042d4fa27f9253ae", "subnet-0768c029b7e2d32c3"],
            "SecurityGroupIds": ["sg-446b8d00"]
        },
        "layers": ["arn:aws:lambda:ap-northeast-1:898466741470:layer:psycopg2-py38:1"],
        "delete_local_zip": true,
        "exclude": ["static", "psycopg2", "pip*", "pip-tools*", "setuptools", "*.pyc", "*.dist-info", "*.so"],
        "events": [{
            "function": "tellya2.lambda_functions.check_messages", 
            "expression": "rate(1 minute)"
        }],
        "certificate_arn": "arn:aws:acm:us-east-1:214849182730:certificate/19237cc2-0571-4045-bc10-face4e581f3d",
        "domain": "[redacted]"
    }
}