3.40.0

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•Last updated Oct 29, 2026

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Bug: CachePersistenceLayer raises IdempotencyValidationError on retries with the same payload when payload_validation_jmespath is set
aws-powertools/powertools-lambda-python#8655 · opened on Oct 22, 2026 · 3.40.0
5
Bug: batch processor crashes with AttributeError when a model validator raises a non-ValueError
aws-powertools/powertools-lambda-python#8660 · opened on Oct 25, 2026 · 3.40.0
2
Bug: SqsFifoPartialProcessor fails the whole batch when a short-circuited record doesn't match the model
aws-powertools/powertools-lambda-python#8661 · opened on Oct 25, 2026 · 3.40.0
2
Bug: idempotent functions sharing a persistence layer silently use the first function's IdempotencyConfig
aws-powertools/powertools-lambda-python#8659 · opened on Oct 25, 2026 · 3.40.0
4
Bug: Kafka ProtobufDeserializer reads Confluent message indexes as plain varints, dropping fields or failing for non-first message types
aws-powertools/powertools-lambda-python#8665 · opened on Oct 25, 2026 · 3.40.0
4
Bug: POWERTOOLS_METRICS_DISABLED is ignored by single_metric, the cold start metric, add_metric auto-flush and Datadog's lambda_metric
aws-powertools/powertools-lambda-python#8667 · opened on Oct 25, 2026 · 3.40.0
2
fix(idempotency): keep the payload hash when completing records in the Redis layer
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#8656 opened Oct 24, 2026 · Updated Oct 25, 2026
2
fix(batch): report records that fail model conversion with non-validation errors
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#8662 opened Oct 25, 2026 · Updated Oct 26, 2026
2
fix(batch): report short-circuited FIFO records that don't match the model
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#8663 opened Oct 25, 2026 · Updated Oct 26, 2026
1
fix(idempotency): warn when a persistence layer is reused with a different config
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#8664 opened Oct 25, 2026 · Updated Oct 25, 2026
1
fix(metrics): respect POWERTOOLS_METRICS_DISABLED in every emission path
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#8668 opened Oct 25, 2026 · Updated Oct 25, 2026
1
fix(kafka): decode Confluent Protobuf message indexes as zigzag varints
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#8670 opened Oct 25, 2026 · Updated Oct 28, 2026
2
Bug: idempotent functions return None on replay when the stored response is falsy (0, False, "", [], {})
aws-powertools/powertools-lambda-python#8700 · opened on Oct 29, 2026 · 3.40.0
3
Bug: CloudWatchLogsEnvelope raises ValidationError on non-JSON logEvents[*].message (e.g. Lambda START/END/REPORT)
aws-powertools/powertools-lambda-python#8695 · opened on Oct 28, 2026 · 3.40.0
4
Bug: ConsumerRecordRecords.key returns None when record key is an empty string
aws-powertools/powertools-lambda-python#8696 · opened on Oct 28, 2026 · 3.40.0
3
Bug: Cookie Expires labels a non-UTC aware datetime as GMT without converting it
aws-powertools/powertools-lambda-python#8671 · opened on Oct 26, 2026 · 3.40.0
2
fix(idempotency): return stored falsy responses on replay
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#8701 opened Oct 29, 2026 · Updated Oct 29, 2026
1
fix(parser): fall back to Python validation for non-JSON string payloads
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#8699 opened Oct 29, 2026 · Updated Oct 29, 2026
1
fix(kafka): deserialize empty string record key instead of returning None
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#8698 opened Oct 28, 2026 · Updated Oct 30, 2026
3

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3.40.0

Bug: CachePersistenceLayer raises IdempotencyValidationError on retries with the same payload when payload_validation_jmespath is set

Bug: batch processor crashes with AttributeError when a model validator raises a non-ValueError

Bug: SqsFifoPartialProcessor fails the whole batch when a short-circuited record doesn't match the model

Bug: idempotent functions sharing a persistence layer silently use the first function's IdempotencyConfig

Bug: Kafka ProtobufDeserializer reads Confluent message indexes as plain varints, dropping fields or failing for non-first message types

Bug: POWERTOOLS_METRICS_DISABLED is ignored by single_metric, the cold start metric, add_metric auto-flush and Datadog's lambda_metric

fix(idempotency): keep the payload hash when completing records in the Redis layer

fix(batch): report records that fail model conversion with non-validation errors

fix(batch): report short-circuited FIFO records that don't match the model

fix(idempotency): warn when a persistence layer is reused with a different config

fix(metrics): respect POWERTOOLS_METRICS_DISABLED in every emission path

fix(kafka): decode Confluent Protobuf message indexes as zigzag varints

Bug: idempotent functions return None on replay when the stored response is falsy (0, False, "", [], {})

Bug: CloudWatchLogsEnvelope raises ValidationError on non-JSON `logEvents[*].message` (e.g. Lambda START/END/REPORT)

Bug: ConsumerRecordRecords.key returns None when record key is an empty string

Bug: Cookie Expires labels a non-UTC aware datetime as GMT without converting it

fix(idempotency): return stored falsy responses on replay

fix(parser): fall back to Python validation for non-JSON string payloads

fix(kafka): deserialize empty string record key instead of returning None

Issues