diff --git a/.github/workflows/build-and-deploy-on-pypi.yml b/.github/workflows/build-and-deploy-on-pypi.yml
index d3662b4eb2..ab70bd112d 100644
--- a/.github/workflows/build-and-deploy-on-pypi.yml
+++ b/.github/workflows/build-and-deploy-on-pypi.yml
@@ -22,10 +22,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Set up Python 3.12
+      - name: Set up Python 3.13
         uses: actions/setup-python@v4
         with:
-          python-version: "3.12"
+          python-version: "3.13"
       - name: Install pep517
         run: >-
           python -m
diff --git a/.github/workflows/create-condalock-file.yml b/.github/workflows/create-condalock-file.yml
index e234d709b2..97501f657c 100644
--- a/.github/workflows/create-condalock-file.yml
+++ b/.github/workflows/create-condalock-file.yml
@@ -27,7 +27,7 @@ jobs:
         with:
           auto-update-conda: true
           activate-environment: esmvaltool-fromlock
-          python-version: "3.12"
+          python-version: "3.13"
           miniforge-version: "latest"
           use-mamba: true
       - name: Update and show conda config
diff --git a/.github/workflows/install-from-conda.yml b/.github/workflows/install-from-conda.yml
index d77ef193aa..9093dfedfd 100644
--- a/.github/workflows/install-from-conda.yml
+++ b/.github/workflows/install-from-conda.yml
@@ -39,7 +39,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       # fail-fast set to False allows all other tests
       # in the workflow to run regardless of any fail
       fail-fast: false
@@ -74,7 +74,7 @@ jobs:
     runs-on: "macos-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64"]  # need to force Intel, arm64 builds have issues
       fail-fast: false
     name: OSX Python ${{ matrix.python-version }}
diff --git a/.github/workflows/install-from-condalock-file.yml b/.github/workflows/install-from-condalock-file.yml
index 44a7839b55..86cce4fde7 100644
--- a/.github/workflows/install-from-condalock-file.yml
+++ b/.github/workflows/install-from-condalock-file.yml
@@ -29,7 +29,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
diff --git a/.github/workflows/install-from-pypi.yml b/.github/workflows/install-from-pypi.yml
index bb18afa7c5..b89205b899 100644
--- a/.github/workflows/install-from-pypi.yml
+++ b/.github/workflows/install-from-pypi.yml
@@ -39,7 +39,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       # fail-fast set to False allows all other tests
       # in the workflow to run regardless of any fail
       fail-fast: false
@@ -76,7 +76,7 @@ jobs:
     runs-on: "macos-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64"]  # need to force Intel, arm64 builds have issues
       fail-fast: false
     name: OSX Python ${{ matrix.python-version }}
diff --git a/.github/workflows/install-from-source.yml b/.github/workflows/install-from-source.yml
index 0d193bd79a..b8e48bdfe7 100644
--- a/.github/workflows/install-from-source.yml
+++ b/.github/workflows/install-from-source.yml
@@ -37,7 +37,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
@@ -73,7 +73,7 @@ jobs:
     runs-on: "macos-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64"]  # need to force Intel, arm64 builds have issues
       fail-fast: false
     name: OSX Python ${{ matrix.python-version }}
diff --git a/.github/workflows/run-tests-monitor.yml b/.github/workflows/run-tests-monitor.yml
index 27c0853730..97fefa3680 100644
--- a/.github/workflows/run-tests-monitor.yml
+++ b/.github/workflows/run-tests-monitor.yml
@@ -22,7 +22,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
@@ -54,7 +54,7 @@ jobs:
     runs-on: "macos-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64"]  # need to force Intel, arm64 builds have issues
       fail-fast: false
     name: OSX Python ${{ matrix.python-version }}
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 743ac00f45..5a2d5c1a30 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -39,7 +39,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
     name: Linux Python ${{ matrix.python-version }}
     steps:
@@ -74,7 +74,7 @@ jobs:
     runs-on: "macos-latest"
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64"]  # need to force Intel, arm64 builds have issues
       fail-fast: false
     name: OSX Python ${{ matrix.python-version }}
diff --git a/pyproject.toml b/pyproject.toml
index efbb3590c1..1c30bd95ee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Atmospheric Science",
     "Topic :: Scientific/Engineering :: GIS",