diff --git a/e2e/BUILD.bazel b/e2e/BUILD.bazel
index b3fcd3e81..18a38018f 100644
--- a/e2e/BUILD.bazel
+++ b/e2e/BUILD.bazel
@@ -36,6 +36,9 @@ write_source_files(
     name = "snapshots",
     testonly = True,
     files = {
+        # @pypi_rdflib_linux — dep_group names must be underscore-normalized.
+        "snapshots/pypi_rdflib_linux.dep_group.BUILD.bazel": "@pypi_rdflib_linux//dep_group:BUILD.bazel",
+
         # @pypi_multi (multi-project: alpha, beta, gamma)
         # ----------------------------------------------------------------
         # Per-package alias with multiple select arms. Catches regressions in
diff --git a/e2e/MODULE.bazel b/e2e/MODULE.bazel
index 3f8d576b3..4d9f9e58a 100644
--- a/e2e/MODULE.bazel
+++ b/e2e/MODULE.bazel
@@ -98,6 +98,7 @@ include("//cases/freethreaded-805:setup.MODULE.bazel")
 include("//cases/multi-project-hub:setup.MODULE.bazel")
 include("//cases/oci:setup.MODULE.bazel")
 include("//cases/pth-namespace-547:setup.MODULE.bazel")
+include("//cases/rdflib-linux:setup.MODULE.bazel")
 include("//cases/pytest-main-867:setup.MODULE.bazel")
 include("//cases/pytest-mock-530:setup.MODULE.bazel")
 include("//cases/pytest-subdir-imports:setup.MODULE.bazel")
@@ -107,6 +108,7 @@ include("//cases/single-project-hub:setup.MODULE.bazel")
 include("//cases/unconstrained-dependencies:setup.MODULE.bazel")
 include("//cases/uv-abi3-compat-853:setup.MODULE.bazel")
 include("//cases/uv-bare-linux-wheels:setup.MODULE.bazel")
+include("//cases/uv-hub-cross-project:setup.MODULE.bazel")
 include("//cases/uv-conflict-817:setup.MODULE.bazel")
 include("//cases/uv-conflict-gte:setup.MODULE.bazel")
 include("//cases/uv-conflict-max-863:setup.MODULE.bazel")
diff --git a/e2e/cases/firebase-admin-import/BUILD.bazel b/e2e/cases/firebase-admin-import/BUILD.bazel
index 5814d7b47..1375ec651 100644
--- a/e2e/cases/firebase-admin-import/BUILD.bazel
+++ b/e2e/cases/firebase-admin-import/BUILD.bazel
@@ -39,7 +39,7 @@ load("//tools:pth_snapshot.bzl", "extract_venv_pth")
 py_test(
     name = "test",
     srcs = ["test.py"],
-    dep_group = "firebase-admin-import",
+    dep_group = "firebase_admin_import",
     main = "test.py",
     deps = [
         "@pypi_firebase_admin_import//firebase_admin",
@@ -53,7 +53,7 @@ py_test(
 py_test(
     name = "test_tool",
     srcs = ["test.py"],
-    dep_group = "firebase-admin-import",
+    dep_group = "firebase_admin_import",
     expose_venv = True,
     isolated = False,
     main = "test.py",
@@ -73,7 +73,7 @@ py_test(
 py_binary(
     name = "firebase_importer",
     srcs = ["test.py"],
-    dep_group = "firebase-admin-import",
+    dep_group = "firebase_admin_import",
     main = "test.py",
     deps = [
         "@pypi_firebase_admin_import//firebase_admin",
diff --git a/e2e/cases/freethreaded-805/BUILD.bazel b/e2e/cases/freethreaded-805/BUILD.bazel
index 98431bae5..4572a4de5 100644
--- a/e2e/cases/freethreaded-805/BUILD.bazel
+++ b/e2e/cases/freethreaded-805/BUILD.bazel
@@ -26,7 +26,7 @@ _LINUX_X86_64 = [
 py_test(
     name = "test_bin",
     srcs = ["test.py"],
-    dep_group = "freethreaded-test",
+    dep_group = "freethreaded_test",
     main = "test.py",
     python_version = "3.13",
     tags = ["manual"],
@@ -46,7 +46,7 @@ platform_transition_test(
 py_test(
     name = "venv_test_bin",
     srcs = ["test.py"],
-    dep_group = "freethreaded-test",
+    dep_group = "freethreaded_test",
     expose_venv = True,
     isolated = False,
     main = "test.py",
diff --git a/e2e/cases/pth-namespace-547/BUILD.bazel b/e2e/cases/pth-namespace-547/BUILD.bazel
index 3779669e3..be104f10b 100644
--- a/e2e/cases/pth-namespace-547/BUILD.bazel
+++ b/e2e/cases/pth-namespace-547/BUILD.bazel
@@ -5,7 +5,7 @@ load("//tools:pth_snapshot.bzl", "extract_venv_pth")
 py_test(
     name = "test",
     srcs = ["__test__.py"],
-    dep_group = "pth-namespace-547",
+    dep_group = "pth_namespace_547",
     expose_venv = True,
     isolated = False,
     main = "__test__.py",
@@ -21,7 +21,7 @@ py_test(
 py_test(
     name = "test_legacy",
     srcs = ["__test__.py"],
-    dep_group = "pth-namespace-547",
+    dep_group = "pth_namespace_547",
     main = "__test__.py",
     deps = [
         "@pypi_pth_namespace_547//jaraco_classes",
diff --git a/e2e/cases/pytest-main-867/BUILD.bazel b/e2e/cases/pytest-main-867/BUILD.bazel
index b4ead1245..e044bb7c3 100644
--- a/e2e/cases/pytest-main-867/BUILD.bazel
+++ b/e2e/cases/pytest-main-867/BUILD.bazel
@@ -5,7 +5,7 @@ load("@aspect_rules_py//py:defs.bzl", "py_pytest_main", "py_test")
 py_test(
     name = "test_example",
     srcs = ["test_example.py"],
-    dep_group = "pytest-main-867",
+    dep_group = "pytest_main_867",
     pytest_main = True,
     deps = ["@pypi_pytest_main_867//pytest"],
 )
@@ -15,7 +15,7 @@ py_test(
 py_test(
     name = "test_naming_regression",
     srcs = ["test_example.py"],
-    dep_group = "pytest-main-867",
+    dep_group = "pytest_main_867",
     pytest_main = True,
     deps = ["@pypi_pytest_main_867//pytest"],
 )
@@ -29,7 +29,7 @@ py_test(
         "test_a.py",
         "test_b.py",
     ],
-    dep_group = "pytest-main-867",
+    dep_group = "pytest_main_867",
     pytest_main = True,
     deps = ["@pypi_pytest_main_867//pytest"],
 )
@@ -39,7 +39,7 @@ py_test(
 py_test(
     name = "test_collection_check",
     srcs = ["test_collection_check.py"],
-    dep_group = "pytest-main-867",
+    dep_group = "pytest_main_867",
     pytest_main = True,
     deps = ["@pypi_pytest_main_867//pytest"],
 )
@@ -58,7 +58,7 @@ py_test(
         "test_a.py",
         ":test_direct_main",
     ],
-    dep_group = "pytest-main-867",
+    dep_group = "pytest_main_867",
     main = ":__test__test_direct_main__.py",
     deps = [
         ":test_direct_main",
diff --git a/e2e/cases/pytest-mock-530/BUILD.bazel b/e2e/cases/pytest-mock-530/BUILD.bazel
index c89598683..74111ec5d 100644
--- a/e2e/cases/pytest-mock-530/BUILD.bazel
+++ b/e2e/cases/pytest-mock-530/BUILD.bazel
@@ -4,7 +4,7 @@ load("@aspect_rules_py//py:defs.bzl", "py_test")
 py_test(
     name = "test_mock_py_test",
     srcs = ["test_mock.py"],
-    dep_group = "pytest-mock-530",
+    dep_group = "pytest_mock_530",
     pytest_main = True,
     deps = [
         "@pypi_pytest_mock_530//pytest",
@@ -18,7 +18,7 @@ py_test(
         "__test__.py",
         "test_mock.py",
     ],
-    dep_group = "pytest-mock-530",
+    dep_group = "pytest_mock_530",
     expose_venv = True,
     isolated = False,
     main = "__test__.py",
diff --git a/e2e/cases/pytest-subdir-imports/BUILD.bazel b/e2e/cases/pytest-subdir-imports/BUILD.bazel
index ad8d0bd57..e8b1b8e89 100644
--- a/e2e/cases/pytest-subdir-imports/BUILD.bazel
+++ b/e2e/cases/pytest-subdir-imports/BUILD.bazel
@@ -9,7 +9,7 @@ py_library(
 py_test(
     name = "test_subdir_import",
     srcs = ["tests/test_subdir.py"],
-    dep_group = "pytest-subdir-imports",
+    dep_group = "pytest_subdir_imports",
     pytest_main = True,
     deps = [
         ":lib",
diff --git a/e2e/cases/pytest-xdist-integration/BUILD.bazel b/e2e/cases/pytest-xdist-integration/BUILD.bazel
index 781b3fd88..d911b3fde 100644
--- a/e2e/cases/pytest-xdist-integration/BUILD.bazel
+++ b/e2e/cases/pytest-xdist-integration/BUILD.bazel
@@ -13,7 +13,7 @@ py_test(
         "-n",
         "2",
     ],
-    dep_group = "pytest-xdist-integration",
+    dep_group = "pytest_xdist_integration",
     pytest_main = True,
     deps = [
         "@pypi_pytest_xdist_integration//pytest",
diff --git a/e2e/cases/rdflib-linux/BUILD.bazel b/e2e/cases/rdflib-linux/BUILD.bazel
new file mode 100644
index 000000000..3c362f3b1
--- /dev/null
+++ b/e2e/cases/rdflib-linux/BUILD.bazel
@@ -0,0 +1,22 @@
+load("@aspect_rules_py//py:defs.bzl", "py_test")
+load("@rules_shell//shell:sh_test.bzl", "sh_test")
+
+# Regression: hyphenated [project].name caused config_setting names with hyphens,
+# breaking dep_group = "rdflib_linux" (underscore) matching. Fix: normalize_name().
+sh_test(
+    name = "dep_group_names_normalized",
+    srcs = ["check_dep_group_names.sh"],
+    args = ["$(location @pypi_rdflib_linux//dep_group:BUILD.bazel)"],
+    data = ["@pypi_rdflib_linux//dep_group:BUILD.bazel"],
+    target_compatible_with = ["@platforms//os:linux"],
+)
+
+py_test(
+    name = "rdflib_linux",
+    srcs = ["__test__.py"],
+    dep_group = "rdflib_linux",
+    main = "__test__.py",
+    python_version = "3.11",
+    target_compatible_with = ["@platforms//os:linux"],
+    deps = ["@pypi_rdflib_linux//rdflib"],
+)
diff --git a/e2e/cases/rdflib-linux/__test__.py b/e2e/cases/rdflib-linux/__test__.py
new file mode 100644
index 000000000..d0302187a
--- /dev/null
+++ b/e2e/cases/rdflib-linux/__test__.py
@@ -0,0 +1,14 @@
+"""Regression: rdflib must be importable on Linux.
+
+Reported error:
+  @@aspect_rules_py++uv+pypi//rdflib:rdflib (cae838)
+    <-- target platform (...:linux_host_platform) didn't satisfy constraint
+        @@platforms//:incompatible
+"""
+
+import rdflib
+from rdflib import Graph
+
+g = Graph()
+assert rdflib.__version__ == "7.1.1", rdflib.__version__
+print("rdflib", rdflib.__version__, "imported and Graph() constructed successfully")
diff --git a/e2e/cases/rdflib-linux/check_dep_group_names.sh b/e2e/cases/rdflib-linux/check_dep_group_names.sh
new file mode 100755
index 000000000..d76007e06
--- /dev/null
+++ b/e2e/cases/rdflib-linux/check_dep_group_names.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Regression: dep_group config_setting names must be normalized (hyphens → underscores).
+# If the hub emits config_setting(name = "rdflib-linux"), then dep_group = "rdflib_linux"
+# never matches and every package in the hub becomes @@platforms//:incompatible.
+set -euo pipefail
+
+BUILD_FILE="${1:?usage: check_dep_group_names.sh <dep_group/BUILD.bazel>}"
+
+if grep -qF '"rdflib-linux"' "$BUILD_FILE"; then
+    echo "FAIL: config_setting name contains hyphens: 'rdflib-linux'"
+    echo "      dep_group = \"rdflib_linux\" (underscore) will never match it."
+    echo "      uv_hub must normalize project names via normalize_name() before"
+    echo "      emitting config_setting targets and flag_values."
+    echo ""
+    grep '"rdflib-linux"' "$BUILD_FILE"
+    exit 1
+fi
+
+echo "PASS: all dep_group config_setting names are underscore-normalized"
diff --git a/e2e/cases/rdflib-linux/pyproject.toml b/e2e/cases/rdflib-linux/pyproject.toml
new file mode 100644
index 000000000..f1fa2fd7d
--- /dev/null
+++ b/e2e/cases/rdflib-linux/pyproject.toml
@@ -0,0 +1,8 @@
+[project]
+name = "rdflib-linux"
+version = "0.0.0"
+authors = []
+requires-python = ">=3.11"
+dependencies = [
+    "rdflib>=7.0.0",
+]
diff --git a/e2e/cases/rdflib-linux/setup.MODULE.bazel b/e2e/cases/rdflib-linux/setup.MODULE.bazel
new file mode 100644
index 000000000..6696546cf
--- /dev/null
+++ b/e2e/cases/rdflib-linux/setup.MODULE.bazel
@@ -0,0 +1,10 @@
+# Regression: hyphenated [project].name → config_setting name mismatch → @@platforms//:incompatible.
+
+uv = use_extension("@aspect_rules_py//uv:extensions.bzl", "uv")
+uv.declare_hub(hub_name = "pypi_rdflib_linux")
+uv.project(
+    hub_name = "pypi_rdflib_linux",
+    lock = "//cases/rdflib-linux:uv.lock",
+    pyproject = "//cases/rdflib-linux:pyproject.toml",
+)
+use_repo(uv, "pypi_rdflib_linux")
diff --git a/e2e/cases/rdflib-linux/uv.lock b/e2e/cases/rdflib-linux/uv.lock
new file mode 100644
index 000000000..3e6ed3b13
--- /dev/null
+++ b/e2e/cases/rdflib-linux/uv.lock
@@ -0,0 +1,45 @@
+version = 1
+revision = 3
+requires-python = ">=3.11"
+
+[[package]]
+name = "isodate"
+version = "0.7.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/54/4d/e940025e2ce31a8ce1202635910747e5a87cc3a6a6bb2d00973375014749/isodate-0.7.2.tar.gz", hash = "sha256:4cd1aa0f43ca76f4a6c6c0292a85f40b35ec2e43e315b59f06e6d32171a953e6", size = 29705, upload-time = "2024-10-08T23:04:11.500Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/15/aa/0aca39a37d3c7eb941ba736ede56d689e7be91cab5d9ca846bde3999eba6/isodate-0.7.2-py3-none-any.whl", hash = "sha256:28009937d8031054830160fce6d409ed342816b543597cece116d966c6d99e15", size = 22320, upload-time = "2024-10-08T23:04:09.501Z" },
+]
+
+[[package]]
+name = "pyparsing"
+version = "3.3.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f3/91/9c6ee907786a473bf81c5f53cf703ba0957b23ab84c264080fb5a450416f/pyparsing-3.3.2.tar.gz", hash = "sha256:c777f4d763f140633dcb6d8a3eda953bf7a214dc4eff598413c070bcdc117cbc", size = 6851574, upload-time = "2026-01-21T03:57:59.36Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/10/bd/c038d7cc38edc1aa5bf91ab8068b63d4308c66c4c8bb3cbba7dfbc049f9c/pyparsing-3.3.2-py3-none-any.whl", hash = "sha256:850ba148bd908d7e2411587e247a1e4f0327839c40e2e5e6d05a007ecc69911d", size = 122781, upload-time = "2026-01-21T03:57:55.912Z" },
+]
+
+[[package]]
+name = "rdflib"
+version = "7.1.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "isodate" },
+    { name = "pyparsing" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/62/b6/4cee25689c7a3dfafeb481d358e74696fe3a8543da4cb2c1b71c0cb6583d/rdflib-7.1.1.tar.gz", hash = "sha256:164de86bd3564558802ca983d84f6616a4a1a420c7a17a8152f5016076b2913e", size = 4864216, upload-time = "2024-10-28T00:50:21.335Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d2/7d/9add7b22a4e695c4f3011ed084ecf725e1f03954b9fa071f1766890b4989/rdflib-7.1.1-py3-none-any.whl", hash = "sha256:e590fa9a2c34ba33a667818b5a84be3fb8a4d85868f8038f17912ec84f912a25", size = 562443, upload-time = "2024-10-28T00:49:45.589Z" },
+]
+
+[[package]]
+name = "rdflib-linux"
+version = "0.0.0"
+source = { virtual = "." }
+dependencies = [
+    { name = "rdflib" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "rdflib", specifier = ">=7.0.0" }]
diff --git a/e2e/cases/uv-abi3-compat-853/BUILD.bazel b/e2e/cases/uv-abi3-compat-853/BUILD.bazel
index c5744be66..721d9cc96 100644
--- a/e2e/cases/uv-abi3-compat-853/BUILD.bazel
+++ b/e2e/cases/uv-abi3-compat-853/BUILD.bazel
@@ -7,7 +7,7 @@ load("@aspect_rules_py//py:defs.bzl", "py_test")
 py_test(
     name = "test_import",
     srcs = ["test_abi3.py"],
-    dep_group = "abi3-compat",
+    dep_group = "abi3_compat",
     main = "test_abi3.py",
     python_version = "3.12",
     target_compatible_with = ["@platforms//os:linux"],
@@ -17,7 +17,7 @@ py_test(
 py_test(
     name = "test_import_venv_test",
     srcs = ["test_abi3.py"],
-    dep_group = "abi3-compat",
+    dep_group = "abi3_compat",
     expose_venv = True,
     isolated = False,
     main = "test_abi3.py",
diff --git a/e2e/cases/uv-hub-cross-project/BUILD.bazel b/e2e/cases/uv-hub-cross-project/BUILD.bazel
new file mode 100644
index 000000000..3e16e02b2
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/BUILD.bazel
@@ -0,0 +1,12 @@
+load("@rules_shell//shell:sh_test.bzl", "sh_test")
+
+# Regression: packages must be isolated to the dep_group of the project that declares them.
+# rdflib is in rdflib-project; other-project has cowsay only. The rdflib hub alias
+# must not contain an other_project arm (cross-project contamination).
+sh_test(
+    name = "cross_project_isolation",
+    srcs = ["check_cross_project_isolation.sh"],
+    args = ["$(location @pypi_cross_hub//rdflib:BUILD.bazel)"],
+    data = ["@pypi_cross_hub//rdflib:BUILD.bazel"],
+    target_compatible_with = ["@platforms//os:linux"],
+)
diff --git a/e2e/cases/uv-hub-cross-project/check_cross_project_isolation.sh b/e2e/cases/uv-hub-cross-project/check_cross_project_isolation.sh
new file mode 100755
index 000000000..ffe4f5342
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/check_cross_project_isolation.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+BUILD="${1:?}"
+
+if grep -qF "other_project" "$BUILD"; then
+    echo "FAIL: rdflib alias contains other_project arm — cross-project contamination"
+    grep "other_project" "$BUILD"
+    exit 1
+fi
+
+if ! grep -qF "rdflib_project" "$BUILD"; then
+    echo "FAIL: rdflib alias missing rdflib_project arm"
+    cat "$BUILD"
+    exit 1
+fi
+
+echo "PASS: rdflib isolated to rdflib_project"
diff --git a/e2e/cases/uv-hub-cross-project/other/BUILD.bazel b/e2e/cases/uv-hub-cross-project/other/BUILD.bazel
new file mode 100644
index 000000000..62032357a
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/other/BUILD.bazel
@@ -0,0 +1,7 @@
+exports_files(
+    [
+        "pyproject.toml",
+        "uv.lock",
+    ],
+    visibility = ["//:__subpackages__"],
+)
diff --git a/e2e/cases/uv-hub-cross-project/other/pyproject.toml b/e2e/cases/uv-hub-cross-project/other/pyproject.toml
new file mode 100644
index 000000000..8e6836675
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/other/pyproject.toml
@@ -0,0 +1,8 @@
+[project]
+name = "other-project"
+version = "0.0.0"
+authors = []
+requires-python = ">=3.11"
+dependencies = [
+    "cowsay",
+]
diff --git a/e2e/cases/uv-hub-cross-project/other/uv.lock b/e2e/cases/uv-hub-cross-project/other/uv.lock
new file mode 100644
index 000000000..329f0d1d2
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/other/uv.lock
@@ -0,0 +1,22 @@
+version = 1
+revision = 3
+requires-python = ">=3.11"
+
+[[package]]
+name = "cowsay"
+version = "6.1"
+source = { registry = "https://pypi.org/simple" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/f1/13/63c0a02c44024ee16f664e0b36eefeb22d54e93531630bd99e237986f534/cowsay-6.1-py3-none-any.whl", hash = "sha256:274b1e6fc1b966d53976333eb90ac94cb07a450a700b455af9fbdf882244b30a", size = 25560, upload-time = "2023-09-25T16:30:01.619Z" },
+]
+
+[[package]]
+name = "other-project"
+version = "0.0.0"
+source = { virtual = "." }
+dependencies = [
+    { name = "cowsay" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "cowsay" }]
diff --git a/e2e/cases/uv-hub-cross-project/pyproject.toml b/e2e/cases/uv-hub-cross-project/pyproject.toml
new file mode 100644
index 000000000..773ac3dfb
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/pyproject.toml
@@ -0,0 +1,8 @@
+[project]
+name = "rdflib-project"
+version = "0.0.0"
+authors = []
+requires-python = ">=3.11"
+dependencies = [
+    "rdflib>=7.0.0",
+]
diff --git a/e2e/cases/uv-hub-cross-project/setup.MODULE.bazel b/e2e/cases/uv-hub-cross-project/setup.MODULE.bazel
new file mode 100644
index 000000000..3f1eb80e2
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/setup.MODULE.bazel
@@ -0,0 +1,15 @@
+# Regression: cross-project dep_group isolation in a multi-project hub.
+
+uv = use_extension("@aspect_rules_py//uv:extensions.bzl", "uv")
+uv.declare_hub(hub_name = "pypi_cross_hub")
+uv.project(
+    hub_name = "pypi_cross_hub",
+    lock = "//cases/uv-hub-cross-project:uv.lock",
+    pyproject = "//cases/uv-hub-cross-project:pyproject.toml",
+)
+uv.project(
+    hub_name = "pypi_cross_hub",
+    lock = "//cases/uv-hub-cross-project/other:uv.lock",
+    pyproject = "//cases/uv-hub-cross-project/other:pyproject.toml",
+)
+use_repo(uv, "pypi_cross_hub")
diff --git a/e2e/cases/uv-hub-cross-project/uv.lock b/e2e/cases/uv-hub-cross-project/uv.lock
new file mode 100644
index 000000000..4b78fd05c
--- /dev/null
+++ b/e2e/cases/uv-hub-cross-project/uv.lock
@@ -0,0 +1,45 @@
+version = 1
+revision = 3
+requires-python = ">=3.11"
+
+[[package]]
+name = "isodate"
+version = "0.7.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/54/4d/e940025e2ce31a8ce1202635910747e5a87cc3a6a6bb2d00973375014749/isodate-0.7.2.tar.gz", hash = "sha256:4cd1aa0f43ca76f4a6c6c0292a85f40b35ec2e43e315b59f06e6d32171a953e6", size = 29705, upload-time = "2024-10-08T23:04:11.500Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/15/aa/0aca39a37d3c7eb941ba736ede56d689e7be91cab5d9ca846bde3999eba6/isodate-0.7.2-py3-none-any.whl", hash = "sha256:28009937d8031054830160fce6d409ed342816b543597cece116d966c6d99e15", size = 22320, upload-time = "2024-10-08T23:04:09.501Z" },
+]
+
+[[package]]
+name = "pyparsing"
+version = "3.3.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f3/91/9c6ee907786a473bf81c5f53cf703ba0957b23ab84c264080fb5a450416f/pyparsing-3.3.2.tar.gz", hash = "sha256:c777f4d763f140633dcb6d8a3eda953bf7a214dc4eff598413c070bcdc117cbc", size = 6851574, upload-time = "2026-01-21T03:57:59.36Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/10/bd/c038d7cc38edc1aa5bf91ab8068b63d4308c66c4c8bb3cbba7dfbc049f9c/pyparsing-3.3.2-py3-none-any.whl", hash = "sha256:850ba148bd908d7e2411587e247a1e4f0327839c40e2e5e6d05a007ecc69911d", size = 122781, upload-time = "2026-01-21T03:57:55.912Z" },
+]
+
+[[package]]
+name = "rdflib"
+version = "7.1.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "isodate" },
+    { name = "pyparsing" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/62/b6/4cee25689c7a3dfafeb481d358e74696fe3a8543da4cb2c1b71c0cb6583d/rdflib-7.1.1.tar.gz", hash = "sha256:164de86bd3564558802ca983d84f6616a4a1a420c7a17a8152f5016076b2913e", size = 4864216, upload-time = "2024-10-28T00:50:21.335Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d2/7d/9add7b22a4e695c4f3011ed084ecf725e1f03954b9fa071f1766890b4989/rdflib-7.1.1-py3-none-any.whl", hash = "sha256:e590fa9a2c34ba33a667818b5a84be3fb8a4d85868f8038f17912ec84f912a25", size = 562443, upload-time = "2024-10-28T00:49:45.589Z" },
+]
+
+[[package]]
+name = "rdflib-project"
+version = "0.0.0"
+source = { virtual = "." }
+dependencies = [
+    { name = "rdflib" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "rdflib", specifier = ">=7.0.0" }]
diff --git a/e2e/cases/uv-plus-version/BUILD.bazel b/e2e/cases/uv-plus-version/BUILD.bazel
index 23c1e7d27..eb348c04b 100644
--- a/e2e/cases/uv-plus-version/BUILD.bazel
+++ b/e2e/cases/uv-plus-version/BUILD.bazel
@@ -3,7 +3,7 @@ load("@aspect_rules_py//py:defs.bzl", "py_test")
 py_test(
     name = "test",
     srcs = ["__test__.py"],
-    dep_group = "plus-version",
+    dep_group = "plus_version",
     main = "__test__.py",
     python_version = "3.12",
     deps = [
@@ -15,7 +15,7 @@ py_test(
 py_test(
     name = "venv_test",
     srcs = ["__test__.py"],
-    dep_group = "plus-version",
+    dep_group = "plus_version",
     expose_venv = True,
     isolated = False,
     main = "__test__.py",
diff --git a/e2e/cases/uv-requirements-bzl/BUILD.bazel b/e2e/cases/uv-requirements-bzl/BUILD.bazel
index 41e0a296e..2ac85ac0e 100644
--- a/e2e/cases/uv-requirements-bzl/BUILD.bazel
+++ b/e2e/cases/uv-requirements-bzl/BUILD.bazel
@@ -24,7 +24,7 @@ _ALL_DATA_REQUIREMENTS_COUNT = len(all_data_requirements)
 py_test(
     name = "requirement_helper_test",
     srcs = ["__test__.py"],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__test__.py",
     python_version = "3.12",
     deps = [requirement("cowsay")],
@@ -34,7 +34,7 @@ py_test(
 py_test(
     name = "pkg_alias_test",
     srcs = ["__test__.py"],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__test__.py",
     python_version = "3.12",
     deps = ["@pypi_requirements_bzl//cowsay:pkg"],
@@ -44,7 +44,7 @@ py_test(
 py_test(
     name = "all_requirements_test",
     srcs = ["__test__.py"],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__test__.py",
     python_version = "3.12",
     deps = all_requirements,
@@ -55,7 +55,7 @@ py_test(
     name = "whl_data_test",
     srcs = ["__whl_test__.py"],
     data = ["@pypi_requirements_bzl//cowsay:whl"],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__whl_test__.py",
     python_version = "3.12",
 )
@@ -65,7 +65,7 @@ py_test(
     name = "all_whl_data_test",
     srcs = ["__whl_test__.py"],
     data = all_whl_requirements,
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__whl_test__.py",
     python_version = "3.12",
 )
@@ -75,7 +75,7 @@ py_test(
     name = "all_whl_by_package_data_test",
     srcs = ["__whl_test__.py"],
     data = [whl for whl in all_whl_requirements_by_package.values()],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__whl_test__.py",
     python_version = "3.12",
 )
@@ -86,7 +86,7 @@ py_test(
 py_test(
     name = "multi_package_imports_test",
     srcs = ["__multi_test__.py"],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__multi_test__.py",
     python_version = "3.12",
     deps = all_requirements,
@@ -98,7 +98,7 @@ py_test(
 py_test(
     name = "requirement_normalization_test",
     srcs = ["__dateutil_test__.py"],
-    dep_group = "requirements-bzl-demo",
+    dep_group = "requirements_bzl_demo",
     main = "__dateutil_test__.py",
     python_version = "3.12",
     deps = [requirement("Python-DateUtil")],
diff --git a/e2e/cases/uv-whl-install-output-group/BUILD.bazel b/e2e/cases/uv-whl-install-output-group/BUILD.bazel
index d92548772..bfa41e5e0 100644
--- a/e2e/cases/uv-whl-install-output-group/BUILD.bazel
+++ b/e2e/cases/uv-whl-install-output-group/BUILD.bazel
@@ -21,7 +21,7 @@ py_test(
     name = "test",
     srcs = ["test.py"],
     data = [":iniconfig_install_dir"],
-    dep_group = "uv-whl-install-output-group",
+    dep_group = "uv_whl_install_output_group",
     main = "test.py",
     python_version = "3.11",
     deps = ["@pypi_uv_whl_install_output_group//iniconfig"],
@@ -31,7 +31,7 @@ py_test(
     name = "venv_test",
     srcs = ["test.py"],
     data = [":iniconfig_install_dir"],
-    dep_group = "uv-whl-install-output-group",
+    dep_group = "uv_whl_install_output_group",
     expose_venv = True,
     isolated = False,
     main = "test.py",
diff --git a/e2e/cases/venv-bin-scripts-423/BUILD.bazel b/e2e/cases/venv-bin-scripts-423/BUILD.bazel
index 2e94cd90e..0a2626fba 100644
--- a/e2e/cases/venv-bin-scripts-423/BUILD.bazel
+++ b/e2e/cases/venv-bin-scripts-423/BUILD.bazel
@@ -3,7 +3,7 @@ load("@aspect_rules_py//py:defs.bzl", "py_test")
 py_test(
     name = "test",
     srcs = ["__test__.py"],
-    dep_group = "venv-bin-scripts-423",
+    dep_group = "venv_bin_scripts_423",
     main = "__test__.py",
     python_version = "3.11",
     deps = [
@@ -14,7 +14,7 @@ py_test(
 py_test(
     name = "test_non_isolated",
     srcs = ["__test__.py"],
-    dep_group = "venv-bin-scripts-423",
+    dep_group = "venv_bin_scripts_423",
     isolated = False,
     main = "__test__.py",
     python_version = "3.11",
@@ -26,7 +26,7 @@ py_test(
 py_test(
     name = "venv_test",
     srcs = ["__test__.py"],
-    dep_group = "venv-bin-scripts-423",
+    dep_group = "venv_bin_scripts_423",
     expose_venv = True,
     isolated = False,
     main = "__test__.py",
diff --git a/e2e/cases/venv-internal-symlinks/BUILD.bazel b/e2e/cases/venv-internal-symlinks/BUILD.bazel
index ed68c9cfa..533735413 100644
--- a/e2e/cases/venv-internal-symlinks/BUILD.bazel
+++ b/e2e/cases/venv-internal-symlinks/BUILD.bazel
@@ -3,7 +3,7 @@ load("@aspect_rules_py//py:defs.bzl", "py_test")
 py_test(
     name = "test_internal_symlinks",
     srcs = ["test_babel.py"],
-    dep_group = "venv-internal-symlinks",
+    dep_group = "venv_internal_symlinks",
     expose_venv = True,
     isolated = False,
     main = "test_babel.py",
@@ -16,7 +16,7 @@ py_test(
 py_test(
     name = "test_internal_symlinks_legacy",
     srcs = ["test_babel.py"],
-    dep_group = "venv-internal-symlinks",
+    dep_group = "venv_internal_symlinks",
     main = "test_babel.py",
     deps = [
         "@pypi_venv_internal_symlinks//babel",
diff --git a/e2e/snapshots/pypi_rdflib_linux.dep_group.BUILD.bazel b/e2e/snapshots/pypi_rdflib_linux.dep_group.BUILD.bazel
new file mode 100644
index 000000000..e938b06d3
--- /dev/null
+++ b/e2e/snapshots/pypi_rdflib_linux.dep_group.BUILD.bazel
@@ -0,0 +1,20 @@
+alias(
+    name = "dep_group",
+    actual = "@aspect_rules_py//uv/private/constraints/dep_group:dep_group",
+    visibility = ["//visibility:public"],
+)
+
+
+config_setting(
+    name = "rdflib_linux",
+    flag_values = {
+        "@aspect_rules_py//uv/private/constraints/dep_group:dep_group": "rdflib_linux",
+    },
+    visibility = ["//visibility:public"],
+)
+
+
+exports_files(
+    ["BUILD.bazel"],
+    visibility = ["//visibility:public"],
+)
diff --git a/uv/private/extension/projectfile.bzl b/uv/private/extension/projectfile.bzl
index 56083a3aa..4cea42021 100644
--- a/uv/private/extension/projectfile.bzl
+++ b/uv/private/extension/projectfile.bzl
@@ -172,9 +172,11 @@ def collect_activated_extras(projectfile, lock_id, project_data, lock_data, defa
           `{dep: {cfg: {extra_dep: {marker: 1}}}}`.
     """
 
-    # If no dependency-groups are specified, use the lock members manifest, or just the self-list
+    # Normalize the synthesized group key so config_setting names use underscores.
+    # Raw [project].name may contain hyphens; a mismatch with dep_group = "foo_bar"
+    # silently marks every hub package as @@platforms//:incompatible.
     dep_groups = project_data.get("dependency-groups", {
-        project_data["project"]["name"]: lock_data.get("manifest", {}).get("members", [
+        normalize_name(project_data["project"]["name"]): lock_data.get("manifest", {}).get("members", [
             project_data["project"]["name"],
         ]),
     })