diff --git a/.github/workflows/run_all_tests.yml b/.github/workflows/run_all_tests.yml
index a316f34..7f688fd 100644
--- a/.github/workflows/run_all_tests.yml
+++ b/.github/workflows/run_all_tests.yml
@@ -22,23 +22,17 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { name: linux-python3.8-minimum      , requirements: minimum    , python-ver: "3.8" , os: ubuntu-latest }
-          - { name: linux-python3.8              , requirements: upgraded   , python-ver: "3.8" , os: ubuntu-latest }
-          - { name: linux-python3.9              , requirements: upgraded   , python-ver: "3.9" , os: ubuntu-latest }
+          - { name: linux-python3.10-minimum     , requirements: minimum    , python-ver: "3.10", os: ubuntu-latest }
           - { name: linux-python3.10             , requirements: upgraded   , python-ver: "3.10", os: ubuntu-latest }
           - { name: linux-python3.11             , requirements: upgraded   , python-ver: "3.11", os: ubuntu-latest }
           - { name: linux-python3.12             , requirements: upgraded   , python-ver: "3.12", os: ubuntu-latest }
           - { name: linux-python3.13             , requirements: upgraded   , python-ver: "3.13", os: ubuntu-latest }
-          - { name: windows-python3.8-minimum    , requirements: minimum    , python-ver: "3.8" , os: windows-latest }
-          - { name: windows-python3.8            , requirements: upgraded   , python-ver: "3.8" , os: windows-latest }
-          - { name: windows-python3.9            , requirements: upgraded   , python-ver: "3.9" , os: windows-latest }
+          - { name: windows-python3.10-minimum   , requirements: minimum    , python-ver: "3.10", os: windows-latest }
           - { name: windows-python3.10           , requirements: upgraded   , python-ver: "3.10", os: windows-latest }
           - { name: windows-python3.11           , requirements: upgraded   , python-ver: "3.11", os: windows-latest }
           - { name: windows-python3.12           , requirements: upgraded   , python-ver: "3.12", os: windows-latest }
           - { name: windows-python3.13           , requirements: upgraded   , python-ver: "3.13", os: windows-latest }
-          - { name: macos-python3.8-minimum      , requirements: minimum    , python-ver: "3.8" , os: macos-latest }
-          - { name: macos-python3.8              , requirements: upgraded   , python-ver: "3.8" , os: macos-latest }
-          - { name: macos-python3.9              , requirements: upgraded   , python-ver: "3.9" , os: macos-latest }
+          - { name: macos-python3.10-minimum     , requirements: minimum    , python-ver: "3.10", os: macos-latest }
           - { name: macos-python3.10             , requirements: upgraded   , python-ver: "3.10", os: macos-latest }
           - { name: macos-python3.11             , requirements: upgraded   , python-ver: "3.11", os: macos-latest }
           - { name: macos-python3.12             , requirements: upgraded   , python-ver: "3.12", os: macos-latest }
@@ -58,7 +52,7 @@ jobs:
         if: ${{ matrix.requirements == 'minimum' }}
         run: |
           python -m pip install --upgrade pip
-          python -m pip install ".[min-reqs,test]"
+          python -m pip install . --group min-reqs --group test
           python -m pip list
           python -m pip check
 
@@ -67,7 +61,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           # force upgrade of all dependencies to latest versions within allowed range
-          python -m pip install -U ".[test]"
+          python -m pip install -U . --group test
           python -m pip list
           python -m pip check
       - name: Run tests
diff --git a/.github/workflows/run_coverage.yml b/.github/workflows/run_coverage.yml
index 8a1e52b..409d186 100644
--- a/.github/workflows/run_coverage.yml
+++ b/.github/workflows/run_coverage.yml
@@ -40,7 +40,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           # force upgrade of all dependencies to latest versions within allowed range
-          python -m pip install -U ".[test]"
+          python -m pip install -U . --group test
           python -m pip list
           python -m pip check
       - name: Run tests and generate coverage report
diff --git a/.gitignore b/.gitignore
index fac0f30..cf85a9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -168,3 +168,4 @@ cython_debug/
 
 # Mac finder
 .DS_Store
+uv.lock
diff --git a/pyproject.toml b/pyproject.toml
index d978dec..6f2e966 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,12 +18,10 @@ authors = [
 ]
 description = "NWB extension to store pose estimation data"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 license = {text = "BSD-3"}
 classifiers = [
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -44,7 +42,8 @@ dependencies = [
     "hdmf>=3.13.0",
 ]
 
-[project.optional-dependencies]
+# Dependency groups (PEP 735) - for development, not published to PyPI
+[dependency-groups]
 test = [
     "coverage>=7.5.4",
     "pytest>=8.2.2",
@@ -52,23 +51,22 @@ test = [
     "pytest-subtests>=0.12.1",
     "python-dateutil>=2.8.2",
 ]
-
 docs = [
     "hdmf-docutils>=0.4.7",
 ]
-
 dev = [
     "black>=24.4.2",
     "codespell>=2.3.0",
     "pre-commit>=3.5.0",
     "ruff>=0.4.10",
-    "ndx-pose[docs,test]",
+    {include-group = "docs"},
+    {include-group = "test"},
 ]
-
-# minimum requirements of project dependencies for testing (see .github/workflows/run_all_tests.yml)
+# minimum requirements of project dependencies for testing on Python 3.10 (see .github/workflows/run_all_tests.yml)
 min-reqs = [
-    "pynwb==2.6.0",
-    "hdmf==3.13.0",
+    "pynwb==2.6.0; python_version == '3.10'",
+    "hdmf==3.13.0; python_version == '3.10'",
+    "numpy<2; python_version == '3.10'",
 ]
 
 # TODO: add URLs before release