diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
index ec98af029e..7b0c4dcfc4 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.yml
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -27,7 +27,7 @@ body:
     attributes:
       label: Python Version
       description: Version of Python interpreter
-      placeholder: 3.9, 3.10, 3.11, etc.
+      placeholder: 3.10, 3.11, 3.12 etc.
     validations:
       required: true
   - type: input
diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index f53cb2d9a9..61124b8e8e 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12']
         numpy_version: ['>=1.24.0', '==1.23.*']
         exclude:
           - python-version: '3.10'
diff --git a/.github/workflows/releases.yml b/.github/workflows/releases.yml
index 20cb5890b4..ec0601f0f4 100644
--- a/.github/workflows/releases.yml
+++ b/.github/workflows/releases.yml
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/setup-python@v5.1.1
         name: Install Python
         with:
-          python-version: '3.9'
+          python-version: '3.11'
 
       - name: Install PyBuild
         run: |
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index e45cae1b45..d7190b4771 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -3,7 +3,7 @@ version: 2
 build:
   os: ubuntu-20.04
   tools:
-    python: "3.9"
+    python: "3.11"
 
 sphinx:
   configuration: docs/conf.py
diff --git a/docs/release.rst b/docs/release.rst
index c40ff5c0d3..9c2840a70a 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -18,6 +18,7 @@ Release notes
    See `GH1777 <https://github.com/zarr-developers/zarr-python/issues/1777>`_ for more details on the upcoming
    3.0 release.
 
+
 .. _release_2.18.3:
 
 2.18.3
@@ -25,17 +26,23 @@ Release notes
 
 Maintenance
 ~~~~~~~~~~~
+* Removed support for Python 3.9.
+  By :user:`David Stansby <dstansby>`
+  
 * Fix a regression when using orthogonal indexing with a scalar.
   By :user:`Deepak Cherian <dcherian>` :issue:`1931`
 
 
 .. _release_2.18.2:
 
+2.18.2
+------
+
 Enhancements
 ~~~~~~~~~~~~
 
 * Add Zstd codec to old V3 code path.
-  By :user:`Ryan Abernathey <rabernat>` 
+  By :user:`Ryan Abernathey <rabernat>`
 
 .. _release_2.18.1:
 
@@ -62,7 +69,7 @@ Maintenance
 * Enable ruff/bugbear rules (B) and fix issues.
   By :user:`Dimitri Papadopoulos Orfanos <DimitriPapadopoulos>` :issue:`1702`.
 
-* Minor updates to use `np.inf` instead of `np.PINF` / `np.NINF` in preparation for NumPy 2.0.0 release. 
+* Minor updates to use `np.inf` instead of `np.PINF` / `np.NINF` in preparation for NumPy 2.0.0 release.
   By :user:`Joe Hamman <jhamman>` :issue:`1842`.
 
 Deprecations
diff --git a/pyproject.toml b/pyproject.toml
index a5668d0d90..da5fb34d89 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ readme = { file = "README.md", content-type = "text/markdown" }
 maintainers = [
     { name = "Alistair Miles", email = "alimanfoo@googlemail.com" }
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     'asciitree',
     'numpy>=1.23',
@@ -30,9 +30,9 @@ classifiers = [
     'Topic :: Software Development :: Libraries :: Python Modules',
     'Operating System :: Unix',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',
+    'Programming Language :: Python :: 3.12',
 ]
 license = { text = "MIT" }
 
@@ -107,6 +107,7 @@ exclude = [
 extend-select = [
     "B"
 ]
+ignore = ["B905"] # zip-without-explicit-strict
 
 [tool.black]
 line-length = 100