diff --git a/pyproject.toml b/pyproject.toml
index 78fc5b8..5f7f5c0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -93,7 +93,7 @@ robosuite = { git = "https://github.com/ARISE-Initiative/robosuite.git", rev = "
 
 [dependency-groups]
 dev = [
-    "pytest>=8,<9", # reason: test runner. Pin <9: pytest 9.0.3 has a collection regression where multiple modules with module-level pytest.importorskip / pytest.skip(allow_module_level=True) emit "ERROR: found no collectors" and conflate every SKIPPED entry under the first module — silently hides skip reasons in tests/sim/ (breaks tests/unit/test_sim_collection.py).
+    "pytest>=8,<10", # reason: test runner. Cap <10: stay within the validated major. The former <9 cap guarded against the pytest 9.0.3 collection regression (module-level pytest.importorskip / pytest.skip(allow_module_level=True) emitted "ERROR: found no collectors" and conflated SKIPPED entries under the first module, hiding skip reasons in tests/sim/); fixed by 9.1.x — the full suite incl. tests/unit/test_sim_collection.py passes on 9.1.1 (see PR #29's CI run).
     "pytest-asyncio>=0.23", # reason: async test support
     "pytest-cov>=5", # reason: coverage reports
     "hypothesis>=6.100", # reason: schema fuzz testing
diff --git a/uv.lock b/uv.lock
index aaa6780..926990b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3161,7 +3161,7 @@ dev = [
     { name = "opentelemetry-exporter-otlp-proto-http", specifier = ">=1.27" },
     { name = "pre-commit", specifier = ">=3.7" },
     { name = "pyright", specifier = ">=1.1" },
-    { name = "pytest", specifier = ">=8,<9" },
+    { name = "pytest", specifier = ">=8,<10" },
     { name = "pytest-asyncio", specifier = ">=0.23" },
     { name = "pytest-cov", specifier = ">=5" },
     { name = "robot-descriptions", specifier = ">=2.0.0" },
@@ -3931,7 +3931,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "8.4.2"
+version = "9.1.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32' or (extra == 'group-17-openral-workspace-libero' and extra == 'group-17-openral-workspace-robocasa')" },
@@ -3940,9 +3940,9 @@ dependencies = [
     { name = "pluggy" },
     { name = "pygments" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/a3/5c/00a0e072241553e1a7496d638deababa67c5058571567b92a7eaa258397c/pytest-8.4.2.tar.gz", hash = "sha256:86c0d0b93306b961d58d62a4db4879f27fe25513d4b969df351abdddb3c30e01", size = 1519618, upload-time = "2025-09-04T14:34:22.711Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e4/47/b9efed96c114afcfa3c9d3fe98a76a1d14c74a9e266d397cf6eb64be5e01/pytest-9.1.1.tar.gz", hash = "sha256:1088fbde8f2b49d95a549a195707afa7a76a3ce9bcadc26b6d71f0ffda5fe313", size = 1636369, upload-time = "2026-06-19T10:58:32.857Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a8/a4/20da314d277121d6534b3a980b29035dcd51e6744bd79075a6ce8fa4eb8d/pytest-8.4.2-py3-none-any.whl", hash = "sha256:872f880de3fc3a5bdc88a11b39c9710c3497a547cfa9320bc3c5e62fbf272e79", size = 365750, upload-time = "2025-09-04T14:34:20.226Z" },
+    { url = "https://files.pythonhosted.org/packages/24/25/1de2678b631f5a49215c6c96fff41ba892b0a34df68d6d80292b1b48aa7f/pytest-9.1.1-py3-none-any.whl", hash = "sha256:37a86b45efb9a47a61a36449063e8e18d0cab3161329fc099eb21783169c4f0c", size = 386536, upload-time = "2026-06-19T10:58:31.347Z" },
 ]
 
 [[package]]