diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 349a45cc6f..901909949d 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -3,7 +3,7 @@
 # The devcontainer should use the build target and run as root with podman
 # or docker with user namespaces.
 #
-FROM python:3.9 as build
+FROM python:3.10 as build
 
 ARG PIP_OPTIONS
 
@@ -24,7 +24,7 @@ WORKDIR /context
 # install python package into /venv
 RUN pip install ${PIP_OPTIONS}
 
-FROM python:3.9-slim as runtime
+FROM python:3.10-slim as runtime
 
 # Add apt-get system dependecies for runtime here if needed
 
diff --git a/.github/actions/install_requirements/action.yml b/.github/actions/install_requirements/action.yml
index 89889a65ac..84be1b910f 100644
--- a/.github/actions/install_requirements/action.yml
+++ b/.github/actions/install_requirements/action.yml
@@ -9,7 +9,7 @@ inputs:
     required: true
   python_version:
     description: Python version to install
-    default: "3.9"
+    default: "3.10"
 
 runs:
   using: composite
diff --git a/.github/workflows/code.yml b/.github/workflows/code.yml
index 05c3d28b6c..da5342a308 100644
--- a/.github/workflows/code.yml
+++ b/.github/workflows/code.yml
@@ -29,12 +29,12 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"] # can add windows-latest, macos-latest
-        python: ["3.10", "3.11"]
+        python: ["3.11"] # 3.12 should be added when p4p is updates
         install: ["-e .[dev]"]
         # Make one version be non-editable to test both paths of version code
         include:
           - os: "ubuntu-latest"
-            python: "3.9"
+            python: "3.10"
             install: ".[dev]"
 
     runs-on: ${{ matrix.os }}
diff --git a/docs/developer/how-to/pin-requirements.rst b/docs/developer/how-to/pin-requirements.rst
index e42226fbcf..278bdeed18 100644
--- a/docs/developer/how-to/pin-requirements.rst
+++ b/docs/developer/how-to/pin-requirements.rst
@@ -46,7 +46,7 @@ of the dependencies and sub-dependencies with pinned versions.
 You can download any of these files by clicking on them. It is best to use
 the one that ran with the lowest Python version as this is more likely to
 be compatible with all the versions of Python in the test matrix.
-i.e. ``requirements-test-ubuntu-latest-3.9.txt`` in this example.
+i.e. ``requirements-test-ubuntu-latest-3.10.txt`` in this example.
 
 Applying the lock file
 ----------------------
diff --git a/docs/developer/tutorials/dev-install.rst b/docs/developer/tutorials/dev-install.rst
index 59f16a919b..0a32bd19a2 100644
--- a/docs/developer/tutorials/dev-install.rst
+++ b/docs/developer/tutorials/dev-install.rst
@@ -16,7 +16,7 @@ Install dependencies
 --------------------
 
 You can choose to either develop on the host machine using a `venv` (which
-requires python 3.9 or later) or to run in a container under `VSCode
+requires python 3.10 or later) or to run in a container under `VSCode
 <https://code.visualstudio.com/>`_
 
 .. tab-set::
diff --git a/docs/user/tutorials/installation.rst b/docs/user/tutorials/installation.rst
index 9e310adbce..73874b60cf 100644
--- a/docs/user/tutorials/installation.rst
+++ b/docs/user/tutorials/installation.rst
@@ -9,7 +9,7 @@ Installation
 Check your version of python
 ----------------------------
 
-You will need python 3.9 or later. You can check your version of python by
+You will need python 3.10 or later. You can check your version of python by
 typing into a terminal::
 
     $ python3 --version
diff --git a/pyproject.toml b/pyproject.toml
index f8a87b9ec4..2499da586a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,6 @@ name = "ophyd-async"
 classifiers = [
     "Development Status :: 3 - Alpha",
     "License :: OSI Approved :: BSD License",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
 ]
@@ -27,7 +26,7 @@ dependencies = [
 dynamic = ["version"]
 license.file = "LICENSE"
 readme = "README.rst"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 
 [project.optional-dependencies]
 ca = ["aioca>=1.6"]