Drop support for Python 3.9

.github/workflows/docs.yml

@@ -28,10 +28,6 @@ jobs:
       with:
         python-version: ${{ matrix.python }}
 
-    - name: Install hdf5 (Ubuntu)
-      if: matrix.python == '3.9' && startsWith(matrix.os, 'ubuntu')
-      run: sudo apt-get update && sudo apt-get install -y libhdf5-dev
-
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip wheel

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v6
       with:
-        python-version: '3.9'
+        python-version: '3.10'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: 3.9
+          python-version: '3.10'
 
       - name: Install build & twine
         run: python -m pip install build twine

.github/workflows/run-tests.yml

@@ -35,7 +35,6 @@ jobs:
           - macos-latest  # M1 architecture
           - macos-15-intel  # non-M1 architecture
         python:
-          - 3.9  # Reaching EOL in October 2025
           - '3.10'  # Needs quotes so YAML doesn't think it's 3.1
           - '3.11'
           - '3.12'
@@ -44,19 +43,19 @@ jobs:
           - normal
         include:
           - os: ubuntu-latest
-            python: 3.9
+            python: '3.10'
             mode: dandi-api
           - os: ubuntu-latest
             python: 3.13
             mode: obolibrary-only
           - os: ubuntu-latest
-            python: 3.9
+            python: '3.10'
             mode: dev-deps
           - os: ubuntu-latest
             python: 3.13
             mode: dev-deps
           - os: ubuntu-latest
-            python: 3.9
+            python: '3.10'
             mode: nfs
 
     steps:

.github/workflows/typing.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: '3.9'
+          python-version: '3.10'
 
       - name: Install dependencies
         run: |

pyproject.toml

@@ -7,7 +7,7 @@ build-backend = 'setuptools.build_meta'
 name = "dandi"
 description = "Command line client for interaction with DANDI instances"
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = {file = "LICENSE"}
 authors = [
     {name = "DANDI developers", email = "[email protected]"},
@@ -36,7 +36,6 @@ classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -51,8 +50,7 @@ dependencies = [
     "click-didyoumean",
     "dandischema ~= 0.12.0",
     "etelemetry >= 0.2.2",
-    # For pydantic to be able to use type annotations like `X | None`
-    "eval_type_backport; python_version < '3.10'",
+
     "fasteners",
     "fscacher >= 0.3.0",
     # Workaround for no wheels for intel OSX as of 3.15