Add Dotnet 10 Lambda runtime by joe4dev · Pull Request #13607 · localstack/localstack

joe4dev · 2026-01-12T17:10:09Z

Motivation

AWS recently (08 JAN 2026) released the new Lambda Runtime Dotnet 10: https://aws.amazon.com/blogs/compute/net-10-runtime-now-available-in-aws-lambda/

Changes

Add Lambda Runtime Dotnet 10
Update Dotnet dependencies to be Dotnet 10 compatible (except for AWSSDK.SQS; test was breaking)
Re-generate Lambda snapshots
Fix make clean target for multiruntime tests

TODO

Run K8 tests: https://github.com/localstack/localstack-pro/actions/runs/20953174107

github-actions · 2026-01-12T17:20:57Z

Test Results - Preflight, Unit

23 068 tests ±0 21 223 ✅ ±0 6m 31s ⏱️ ±0s
1 suites ±0 1 845 💤 ±0
1 files ±0 0 ❌ ±0

Results for commit bd3dd89. ± Comparison against base commit e1822b3.

♻️ This comment has been updated with latest results.

github-actions · 2026-01-12T17:33:06Z

Test Results (amd64) - Acceptance

7 tests ±0 5 ✅ ±0 3m 3s ⏱️ +4s
1 suites ±0 2 💤 ±0
1 files ±0 0 ❌ ±0

Results for commit bd3dd89. ± Comparison against base commit e1822b3.

♻️ This comment has been updated with latest results.

github-actions · 2026-01-12T18:02:28Z

Test Results (amd64) - Integration, Bootstrap

5 files ± 0 5 suites ±0 2h 1m 26s ⏱️ - 34m 45s
3 772 tests - 1 811 3 487 ✅ - 1 528 285 💤 - 283 0 ❌ ±0
3 778 runs - 1 811 3 487 ✅ - 1 528 291 💤 - 283 0 ❌ ±0

Results for commit bd3dd89. ± Comparison against base commit e1822b3.

This pull request removes 1818 and adds 7 tests. Note that renamed tests count towards both.

tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

tests.aws.services.lambda_.test_lambda_api.TestLambdaSnapStart ‑ test_snapstart_lifecycle[dotnet10]
tests.aws.services.lambda_.test_lambda_api.TestLambdaSnapStart ‑ test_snapstart_update_function_configuration[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaCallingLocalstack ‑ test_manual_endpoint_injection[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_echo_invoke[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_introspection_invoke[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_runtime_wrapper_invoke[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_uncaught_exception_invoke[dotnet10]

♻️ This comment has been updated with latest results.

github-actions · 2026-01-12T18:14:27Z

LocalStack Community integration with Pro

2 files ± 0 2 suites ±0 1h 30m 0s ⏱️ - 28m 13s
3 748 tests - 1 414 3 459 ✅ - 1 305 289 💤 - 109 0 ❌ ±0
3 750 runs - 1 414 3 459 ✅ - 1 305 291 💤 - 109 0 ❌ ±0

Results for commit bd3dd89. ± Comparison against base commit e1822b3.

This pull request removes 1421 and adds 7 tests. Note that renamed tests count towards both.

tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

tests.aws.services.lambda_.test_lambda_api.TestLambdaSnapStart ‑ test_snapstart_lifecycle[dotnet10]
tests.aws.services.lambda_.test_lambda_api.TestLambdaSnapStart ‑ test_snapstart_update_function_configuration[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaCallingLocalstack ‑ test_manual_endpoint_injection[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_echo_invoke[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_introspection_invoke[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_runtime_wrapper_invoke[dotnet10]
tests.aws.services.lambda_.test_lambda_common.TestLambdaRuntimesCommon ‑ test_uncaught_exception_invoke[dotnet10]

♻️ This comment has been updated with latest results.

dfangl

LGTM!

dfangl · 2026-01-13T09:59:14Z

tests/aws/services/lambda_/functions/common/echo/provided/src/bootstrap


  # Send the response (using stdin to circumvent max input length)
-  echo ${RESPONSE} | curl -X POST "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/$REQUEST_ID/response" --data @'-'
+  echo "$RESPONSE" | curl -X POST "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/${REQUEST_ID}/response" --data @'-'


Good catch!

Add Dotnet 10 Lambda runtime

6052353

joe4dev self-assigned this Jan 12, 2026

joe4dev added semver: minor Non-breaking changes which can be included in minor releases, but not in patch releases docs: skip Pull request does not require documentation changes notes: needed Pull request should be mentioned in the release notes labels Jan 12, 2026

Add devrel announcement step

bd3dd89

joe4dev marked this pull request as ready for review January 13, 2026 08:37

joe4dev requested review from dfangl, dominikschubert and gregfurman as code owners January 13, 2026 08:37

dfangl approved these changes Jan 13, 2026

View reviewed changes

joe4dev merged commit 98e5406 into main Jan 13, 2026
44 checks passed

joe4dev deleted the add-dotnet10-runtime branch January 13, 2026 12:21

joe4dev mentioned this pull request Jan 13, 2026

Fix Lambda Rust cross-arch build and update dependencies #13614

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Add Dotnet 10 Lambda runtime#13607

Add Dotnet 10 Lambda runtime#13607
joe4dev merged 2 commits intomainfrom
add-dotnet10-runtime

joe4dev commented Jan 12, 2026 •

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Motivation

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TODO

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Test Results - Preflight, Unit

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Test Results (amd64) - Acceptance

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Test Results (amd64) - Integration, Bootstrap

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LocalStack Community integration with Pro

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