diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d9f532f..9a150c9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,11 +21,11 @@ jobs:
       matrix:
         include:
           - os: "ubuntu-latest"
-            python-version: '3.8'  # first supported
+            python-version: '3.9'  # first supported
           - os: "windows-latest"
-            python-version: '3.8'  # first supported
+            python-version: '3.9'  # first supported
           - os: "macos-latest"
-            python-version: '3.8'  # first supported
+            python-version: '3.9'  # first supported
           - os: "ubuntu-latest"
             python-version: '3.12'  # latest supported
           - os: "windows-latest"
diff --git a/docs/env.yml b/docs/env.yml
index fa39cdb..be12fb8 100644
--- a/docs/env.yml
+++ b/docs/env.yml
@@ -1,17 +1,15 @@
 # To keep the RTD build as small as possible, we define a separate .yml here
+# Other doc dependencies are defined in setup.cfg and installed via `pip install .[docs]`
 name: docs
 channels:
 - conda-forge
 - defaults
 dependencies:
-- python=3.10
-- ipykernel
-- nbsphinx
+- python=3.12
 - mock
 - pillow
 - sphinx<7
 - sphinx_rtd_theme
-- pip
 - pip:
   - recommonmark
   - readthedocs-sphinx-ext
\ No newline at end of file
diff --git a/setup.cfg b/setup.cfg
index 6f3beb3..f43f569 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -37,6 +37,7 @@ install_requires =
     pyproj
     pykdtree
     scipy
+
 # The usage of test_requires is discouraged, see `Dependency Management` docs
 tests_require = pytest; pytest-cov
 # Require a specific Python version, e.g. Python 2.7 or >= 3.4
@@ -56,6 +57,13 @@ testing =
     pytest
     pytest-cov
 
+docs =
+    ipykernel
+    nbconvert
+    matplotlib
+    nbsphinx
+    sphinx_rtd_theme
+
 [options.entry_points]
 # Add here console scripts like:
 # console_scripts =