UV Package version bug repro

.gitignore

# Python-generated files
__pycache__/
*.py[oc]
build/
dist/
wheels/
*.egg-info

# Virtual environments
.venv

.python-version

3.13.6

README.md

uv sync --frozen --no-dev incorrectly removes runtime dependencies

Bug Description

uv sync --frozen --no-dev removes runtime dependencies (types-boto3-ecr) even though they are required in the lock file.

Reproduction

The full project is here in a gist, but this is what I did to get there:

https://gist.github.com/jaseemabid/e2acd88b8ccb59e5d60b591247a4655c

This is a fairly tiny project with 2 runtime and 1 dev dependency.

❯ uv init
❯ uv add "boto3>=1.40"
❯ uv add "types-boto3-ecr>=1.40"

❯ uv add --dev "types-boto3[full]==1.40"
❯ uv sync

The full lockfile is included in the gist.

Expected vs Actual

I expected this to work fine, since the package is explicitly requested:

❯ uv run --no-dev python -c 'import types_boto3_ecr'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    import types_boto3_ecr
ModuleNotFoundError: No module named 'types_boto3_ecr'

This only works without the --no-dev flag, but I can't tell why.

❯ uv run python -c 'import types_boto3_ecr'

Expected: types-boto3-ecr should be available (it's a runtime dependency) Actual: ModuleNotFoundError - package is missing despite being in runtime dependencies

This is pretty concerning that a package I have explicitly mentioned in project.toml which UV also added to uv.lock isn't in the final virtual env.

I had runtime crashes because of this issue and it's kinda bad.

Environment

• uv 0.8.6 (Homebrew 2025-08-07)
• Python 3.13.6
• Reproduced on macOS and Docker Linux

main.py

def main():
    print("Hello from uv-package-test!")


if __name__ == "__main__":
    main()

pyproject.toml

[project]
name = "uv-package-test"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.13"
dependencies = [
    "boto3>=1.40",
    "types-boto3-ecr>=1.40",
]

[dependency-groups]
dev = [
    "types-boto3[full]==1.40",
]

uv.lock

version = 1
revision = 3
requires-python = ">=3.13"

[[package]]
name = "boto3"
version = "1.40.7"
source = { registry = "https://pypi.org/simple" }
dependencies = [
    { name = "botocore" },
    { name = "jmespath" },
    { name = "s3transfer" },
]
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[[package]]
name = "botocore"
version = "1.40.7"
source = { registry = "https://pypi.org/simple" }
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    { name = "jmespath" },
    { name = "python-dateutil" },
    { name = "urllib3" },
]
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[[package]]
name = "botocore-stubs"
version = "1.38.46"
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dependencies = [
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[[package]]
name = "jmespath"
version = "1.0.1"
source = { registry = "https://pypi.org/simple" }
sdist = { url = "https://files.pythonhosted.org/packages/00/2a/e867e8531cf3e36b41201936b7fa7ba7b5702dbef42922193f05c8976cd6/jmespath-1.0.1.tar.gz", hash = "sha256:90261b206d6defd58fdd5e85f478bf633a2901798906be2ad389150c5c60edbe", size = 25843, upload-time = "2022-06-17T18:00:12.224Z" }
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[[package]]
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[[package]]
name = "s3transfer"
version = "0.13.1"
source = { registry = "https://pypi.org/simple" }
dependencies = [
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]
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[[package]]
name = "six"
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[[package]]
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version = "0.27.5"
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[[package]]
name = "types-boto3"
version = "1.40.0"
source = { registry = "https://pypi.org/simple" }
dependencies = [
    { name = "botocore-stubs" },
    { name = "types-s3transfer" },
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[package.optional-dependencies]
full = [
    { name = "types-boto3-full" },
]

[[package]]
name = "types-boto3-ecr"
version = "1.40.0"
source = { registry = "https://pypi.org/simple" }
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[[package]]
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[[package]]
name = "uv-package-test"
version = "0.1.0"
source = { virtual = "." }
dependencies = [
    { name = "boto3" },
    { name = "types-boto3-ecr" },
]

[package.dev-dependencies]
dev = [
    { name = "types-boto3", extra = ["full"] },
]

[package.metadata]
requires-dist = [
    { name = "boto3", specifier = ">=1.40" },
    { name = "types-boto3-ecr", specifier = ">=1.40" },
]

[package.metadata.requires-dev]
dev = [{ name = "types-boto3", extras = ["full"], specifier = "==1.40" }]