diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index ca46e38b..f54f78bb 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     services:
       redis:
diff --git a/pyproject.toml b/pyproject.toml
index 6aa22a4a..7e5f9f3c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,6 +22,7 @@ classifiers = [
   'Programming Language :: Python :: 3.9',
   'Programming Language :: Python :: 3.10',
   'Programming Language :: Python :: 3.11',
+  'Programming Language :: Python :: 3.12',
   'Framework :: Flask',
   'License :: OSI Approved :: BSD License',
   'Operating System :: OS Independent',
diff --git a/src/coaster/app.py b/src/coaster/app.py
index 3efc67a7..ab13c6a2 100644
--- a/src/coaster/app.py
+++ b/src/coaster/app.py
@@ -244,7 +244,7 @@ def init_app(
 
     .. note::
         YAML support requires PyYAML_. TOML requires toml_ with Flask 2.2, or tomli_
-        with Flask 2.3, or Python's inbuilt tomllib_ with Flask 2.3 and Python 3.11.
+        with Flask 2.3, or Python's inbuilt tomllib_ with Flask 2.3 and Python 3.11+.
         tomli_ and tomllib_ are not compatible with Flask 2.2 as they require the file
         to be opened in binary mode, an optional flag introduced in Flask 2.3.