diff --git a/.github/workflows/build_workflow.yml b/.github/workflows/build_workflow.yml
index e34029cf0..88fe4e917 100644
--- a/.github/workflows/build_workflow.yml
+++ b/.github/workflows/build_workflow.yml
@@ -61,7 +61,7 @@ jobs:
         shell: bash -l {0}
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v5
diff --git a/conda_package/ci/linux_64_python3.9.____cpython.yaml b/conda_package/ci/linux_64_python3.9.____cpython.yaml
deleted file mode 100644
index ed8d7a414..000000000
--- a/conda_package/ci/linux_64_python3.9.____cpython.yaml
+++ /dev/null
@@ -1,37 +0,0 @@
-c_stdlib:
-- sysroot
-c_stdlib_version:
-- '2.17'
-cdt_name:
-- conda
-channel_sources:
-- conda-forge
-channel_targets:
-- conda-forge main
-cxx_compiler:
-- gxx
-cxx_compiler_version:
-- '14'
-docker_image:
-- quay.io/condaforge/linux-anvil-x86_64:alma9
-fortran_compiler:
-- gfortran
-fortran_compiler_version:
-- '14'
-hdf5:
-- 1.14.6
-libnetcdf:
-- 4.9.2
-netcdf_fortran:
-- '4.6'
-pin_run_as_build:
-  python:
-    min_pin: x.x
-    max_pin: x.x
-python:
-- 3.9.* *_cpython
-target_platform:
-- linux-64
-zip_keys:
-- - cxx_compiler_version
-  - fortran_compiler_version
diff --git a/conda_package/ci/osx_64_python3.9.____cpython.yaml b/conda_package/ci/osx_64_python3.9.____cpython.yaml
deleted file mode 100644
index ece171912..000000000
--- a/conda_package/ci/osx_64_python3.9.____cpython.yaml
+++ /dev/null
@@ -1,41 +0,0 @@
-MACOSX_DEPLOYMENT_TARGET:
-- '10.13'
-MACOSX_SDK_VERSION:
-- '10.13'
-c_stdlib:
-- macosx_deployment_target
-c_stdlib_version:
-- '10.13'
-channel_sources:
-- conda-forge
-channel_targets:
-- conda-forge main
-cxx_compiler:
-- clangxx
-cxx_compiler_version:
-- '19'
-fortran_compiler:
-- gfortran
-fortran_compiler_version:
-- '14'
-hdf5:
-- 1.14.6
-libnetcdf:
-- 4.9.2
-llvm_openmp:
-- '19'
-macos_machine:
-- x86_64-apple-darwin13.4.0
-netcdf_fortran:
-- '4.6'
-pin_run_as_build:
-  python:
-    min_pin: x.x
-    max_pin: x.x
-python:
-- 3.9.* *_cpython
-target_platform:
-- osx-64
-zip_keys:
-- - cxx_compiler_version
-  - fortran_compiler_version
diff --git a/conda_package/dev-spec.txt b/conda_package/dev-spec.txt
index 90e46adc6..afcfa87c5 100644
--- a/conda_package/dev-spec.txt
+++ b/conda_package/dev-spec.txt
@@ -2,7 +2,7 @@
 # $ conda create --name <env> --file <this file>
 
 # Base
-python>=3.9
+python>=3.10
 cartopy
 cmocean
 dask
diff --git a/conda_package/docs/making_changes.rst b/conda_package/docs/making_changes.rst
index b339d077c..4cf69e13d 100644
--- a/conda_package/docs/making_changes.rst
+++ b/conda_package/docs/making_changes.rst
@@ -137,7 +137,7 @@ under the ``# Base`` comment:
     # $ conda create --name <env> --file <this file>
 
     # Base
-    python>=3.9
+    python>=3.10
     cartopy
     ...
 
diff --git a/conda_package/pyproject.toml b/conda_package/pyproject.toml
index ea1f16f2a..ea1520574 100644
--- a/conda_package/pyproject.toml
+++ b/conda_package/pyproject.toml
@@ -37,10 +37,9 @@ description = """\
     """
 license = { file = "LICENSE" }
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
     # these are only for searching/browsing projects on PyPI
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",