diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index ebabb94..318bc59 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -15,11 +15,11 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-          - macos-14
+          - macos-latest
           # Disabling Windows tests as it's known to not work:
           # https://github.com/SciML/diffeqpy/pull/86#issuecomment-1011675735
           # - windows-latest
-        python-version: ['3.8', '3.12']
+        python-version: ['3.8', '3.13']
       fail-fast: false
     name: Test ${{ matrix.os }} ${{ matrix.architecture }}
       Python ${{ matrix.python-version }}
diff --git a/setup.py b/setup.py
index ddaa662..59b1e22 100644
--- a/setup.py
+++ b/setup.py
@@ -17,6 +17,7 @@ def readme():
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Topic :: Scientific/Engineering :: Mathematics',
         'Topic :: Scientific/Engineering :: Physics'
       ],