diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 2716e7f792..2d6a3b78e0 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
       fail-fast: true
       matrix:
         os: ["windows-latest", "ubuntu-latest", "macos-latest"]
-        python-version: ["3.9", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         experimental: [false]
         include:
           - python-version: "3.12"
diff --git a/.github/workflows/deploy-sdist.yaml b/.github/workflows/deploy-sdist.yaml
index 9fd1d86b5a..328c5b4d93 100644
--- a/.github/workflows/deploy-sdist.yaml
+++ b/.github/workflows/deploy-sdist.yaml
@@ -19,7 +19,7 @@ jobs:
         shell: bash -l {0}
         run: |
           python -m pip install -q build
-          python -m build -s
+          python -m build
 
       - name: Publish package to PyPI
         if: github.event.action == 'published'
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4a90da5ce9..81bdddd6f7 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -27,7 +27,7 @@ repos:
           - types-pkg-resources
           - types-PyYAML
           - types-requests
-        args: ["--python-version", "3.9", "--ignore-missing-imports"]
+        args: ["--python-version", "3.10", "--ignore-missing-imports"]
   - repo: https://github.com/pycqa/isort
     rev: 5.13.2
     hooks:
diff --git a/doc/rtd_environment.yml b/doc/rtd_environment.yml
index 1e40cbb73a..e21857d01d 100644
--- a/doc/rtd_environment.yml
+++ b/doc/rtd_environment.yml
@@ -2,7 +2,7 @@ name: readthedocs
 channels:
   - conda-forge
 dependencies:
-  - python=3.10
+  - python=3.11
   - pip
   - appdirs
   - dask
diff --git a/satpy/tests/reader_tests/test_viirs_edr_active_fires.py b/satpy/tests/reader_tests/test_viirs_edr_active_fires.py
index 7bede07292..92ea99a3fb 100644
--- a/satpy/tests/reader_tests/test_viirs_edr_active_fires.py
+++ b/satpy/tests/reader_tests/test_viirs_edr_active_fires.py
@@ -38,19 +38,19 @@
 DEFAULT_FILE_SHAPE = (1, 100)
 
 DEFAULT_LATLON_FILE_DTYPE = np.float32
-DEFAULT_LATLON_FILE_DATA = np.arange(start=43, stop=45, step=0.02,
+DEFAULT_LATLON_FILE_DATA = np.arange(43, stop=45, step=0.02,
                                      dtype=DEFAULT_LATLON_FILE_DTYPE).reshape(DEFAULT_FILE_SHAPE)
 
 DEFAULT_DETECTION_FILE_DTYPE = np.uint8
-DEFAULT_DETECTION_FILE_DATA = np.arange(start=60, stop=100, step=0.4,
+DEFAULT_DETECTION_FILE_DATA = np.arange(60, stop=100, step=0.4,
                                         dtype=DEFAULT_DETECTION_FILE_DTYPE).reshape(DEFAULT_FILE_SHAPE)
 
 DEFAULT_M13_FILE_DTYPE = np.float32
-DEFAULT_M13_FILE_DATA = np.arange(start=300, stop=340, step=0.4,
+DEFAULT_M13_FILE_DATA = np.arange(300, stop=340, step=0.4,
                                   dtype=DEFAULT_M13_FILE_DTYPE).reshape(DEFAULT_FILE_SHAPE)
 
 DEFAULT_POWER_FILE_DTYPE = np.float32
-DEFAULT_POWER_FILE_DATA = np.arange(start=1, stop=25, step=0.24,
+DEFAULT_POWER_FILE_DATA = np.arange(1, stop=25, step=0.24,
                                     dtype=DEFAULT_POWER_FILE_DTYPE).reshape(DEFAULT_FILE_SHAPE)
 
 
diff --git a/setup.py b/setup.py
index 3439e8fa89..db17b7d035 100644
--- a/setup.py
+++ b/setup.py
@@ -165,7 +165,7 @@ def _config_data_files(base_dirs, extensions=(".cfg", )):
                               ]},
       zip_safe=False,
       install_requires=requires,
-      python_requires=">=3.9",
+      python_requires=">=3.10",
       extras_require=extras_require,
       entry_points=entry_points,
       )