[dependabot]

Bumps pydantic-settings from 2.15.0 to 2.16.2.

Release notes

Sourced from pydantic-settings's releases.

v2.16.1

Highlights

This patch release fixes two CLI regressions introduced in 2.16.0.

Bug fixes

CLI

• Fixed-length tuple positionals such as CliPositionalArg[tuple[int, int]] and NamedTuples are single-valued again (#1069). Since 2.16.0 they were treated as variadic, so a CLI either refused to start with a SettingsError or put the wrong argument into the tuple. Variable-length tuples (tuple[int, ...] and bare Tuple) are still variadic.
• A field typed as an alias of a list of dicts, e.g. type ListOfDict = list[dict[str, int]], accepts a JSON list again (#1049). Since 2.16.0, --xx '[{"a":1},{"b":2}]' was merged into the single dict {"a": 1, "b": 2} and failed validation.

What's Changed

• Harden CI by @​Viicos in pydantic/pydantic-settings#1044
• Keep list of dicts CLI values as lists by @​hramezani in pydantic/pydantic-settings#1049
• Keep fixed-length tuple CLI positionals single-valued by @​hramezani in pydantic/pydantic-settings#1069
• Prepare release 2.16.1 by @​hramezani in pydantic/pydantic-settings#1087
• build(deps): bump the python-packages group with 3 updates by @​dependabot[bot] in pydantic/pydantic-settings#1056

Full Changelog: pydantic/pydantic-settings@v2.16.0...v2.16.1

v2.16.0

Highlights

Breaking changes and behavior changes

• Python 3.10 is no longer supported (#1003). pydantic-settings now requires Python 3.11+, since 3.10 reaches end of life this month. The tomli fallback is gone in favor of stdlib tomllib; the toml extra is kept as an empty extra so pip install pydantic-settings[toml] keeps working.
• python-dotenv>=1.2.2 is now required (#971) to pick up the fix for CVE-2026-28684.
• Aliases are ignored in every source when validate_by_alias=False (#1033). Env vars, secrets, CLI flags and defaults now use only field names, matching pydantic. An env var named after the alias is now ignored instead of raising extra_forbidden, and the CLI exposes --apple rather than --pomo.
• validation_alias takes precedence over alias (#1038). When the two differ, values from JSON/YAML/TOML files and the CLI were silently ignored; they now load. CLI help lists the validation_alias flag first, and CliApp.serialize emits it.
• CLI case-insensitivity only lowercases registered options (#1036). With case_sensitive=False, args after -- and those captured by CliUnknownArgs keep their case (-Xmx4G no longer becomes -xmx4g). Unrecognized options are now reported as typed (--NOPE instead of --nope).
• JSON and YAML config files are read as UTF-8 by default (#955) instead of the locale encoding, completing the secrets-file fix from 2.15.0. json_file_encoding/yaml_file_encoding still override it.
• Discriminated union defaults are partially updated again (#997). This reverts the 2.15.0 regression with nested_model_default_partial_update=True: the default is only dropped when the incoming value selects a different union member.

New features

• Python 3.15 and pydantic 2.14 support (#1026, #1029, #1022). pydantic 2.14 broke CliApp.run and validate_by_alias=False handling; both are fixed.
• Cached settings instances via Settings.settings_cached() and Settings.settings_clear_cache() (#952). These give you a process-local singleton per settings class without hand-rolling lru_cache wrappers. Calling the class directly still builds a fresh instance.
• AWS Systems Manager Parameter Store source — AWSSystemsManagerSettingsSource (#941). It recursively reads every parameter under an ssm_path, with / mapping onto nested models. Install it with the new aws-systems-manager extra.
• env_file_depth (#940) lets a relative env_file be found in parent directories, mirroring pyproject_toml_depth. This is useful when scripts run from a subdirectory of a monorepo. It defaults to 0, which keeps the current behavior.
• CliVariadicArg for named variadic options (#949, #958). It accepts --param a b c in addition to repeated --param a --param b. Required fields need at least one value.

Bug fixes

CLI

... (truncated)

Commits

• 94150a0 Prepare release 2.16.2 (#1111)
• 9e02de0 Fix JSON decoding of nested dictionary environment values (#1109)
• 7e2dacb Fix CliApp reconstruction of AliasPath inputs (#1096)
• 2d1f924 Fix explicit nested secrets directory precedence (#1093)
• e9588ae Fix regressions from nested dict union value decoding (#1089) (#1097)
• e71a53e Decode nested dictionary values with complex union types (#1089)
• 8dc9e05 Resolve only the discriminator annotation of stdlib dataclass defaults (#1077)
• c50c853 Detect nested Field discriminators in default partial updates (#1076)
• 9aabb8a build(deps): bump the python-packages group with 3 updates (#1056)
• 4e286e2 Prepare release 2.16.1 (#1087)
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