diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 0b16af5..9b4b9ca 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         # Default builds are on Ubuntu
         os: [ubuntu-latest]
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', 'pypy-3.8', 'pypy-3.9', 'pypy-3.10']
+        python-version: ['3.8', '3.9', '3.10', '3.11', 'pypy-3.8', 'pypy-3.9', 'pypy-3.10']
         include:
           # Also test on macOS and Windows using latest Python 3
           - os: macos-latest
diff --git a/setup.py b/setup.py
index 0740f7a..d95ad12 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,6 @@
             'Programming Language :: Python :: 3.9',
             'Programming Language :: Python :: 3.10',
             'Programming Language :: Python :: 3.11',
-            'Programming Language :: Python :: 3.12',
       ],
       # What does your project relate to?
       keywords='synthetic biology',