diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index a0e3ba7..922b616 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout
diff --git a/config/__init__.py b/config/__init__.py
index 0e2393b..23b2dd3 100644
--- a/config/__init__.py
+++ b/config/__init__.py
@@ -12,19 +12,15 @@
 except ImportError:  # pragma: no cover
     yaml = None
 
-if sys.version_info[1] < 11:
+if sys.version_info < (3, 11):  # pragma: no cover
     try:
-        import toml
+        import tomli as toml
 
-        toml_readtype = "rt"
-    except ImportError:  # pragma: no cover
-        toml = None
-        toml_readtype = ""
-else:
+    except ImportError:
+        toml = None  # type: ignore
+else:  # pragma: no cover
     import tomllib as toml
 
-    toml_readtype = "rb"
-
 
 from .configuration import Configuration
 from .configuration_set import ConfigurationSet
@@ -871,7 +867,7 @@ def _reload(self, data: Union[str, TextIO], read_from_file: bool = False) -> Non
         """Reload the TOML data."""
         if read_from_file:
             if isinstance(data, str):
-                with open(data, toml_readtype) as f:
+                with open(data, "rb") as f:
                     loaded = toml.load(f)
             else:
                 loaded = toml.load(data)  # type: ignore [arg-type,unused-ignore]
diff --git a/pyproject.toml b/pyproject.toml
index 48d61d7..d3afd77 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,10 +17,10 @@ azure-identity = { version = "^1.13.0", optional = true }
 azure-keyvault = { version = "^4.2.0", optional = true }
 boto3 = { version = "^1.28.20", optional = true }
 google-cloud-secret-manager = { version = "^2.16.3", optional = true }
-hvac = { version ="^1.1.1", optional = true }
+hvac = { version = "^1.1.1", optional = true }
 pyyaml = { version = "^6.0", optional = true }
-toml = { version = "^0.10.0", optional = true }
 jsonschema = { version = "^4.18.6", optional = true }
+tomli = { version = "^2.0.1", optional = true }
 
 [tool.poetry.group.dev.dependencies]
 mypy = "^1.4.1"
@@ -40,14 +40,28 @@ pytest-ruff = "^0.2.1"
 aws = ["boto3"]
 azure = ["azure-keyvault", "azure-identity"]
 gcp = ["google-cloud-secret-manager"]
-toml = ["toml"]
+toml = ["tomli"]
 vault = ["hvac"]
 yaml = ["pyyaml"]
 validation = ["jsonschema"]
 
 [tool.ruff]
 line-length = 88
-select = ['F', 'E', 'W', 'I', 'N', 'D', 'B', 'A', 'COM', 'C4', 'T20', 'Q', 'SIM']
+select = [
+    'F',
+    'E',
+    'W',
+    'I',
+    'N',
+    'D',
+    'B',
+    'A',
+    'COM',
+    'C4',
+    'T20',
+    'Q',
+    'SIM',
+]
 exclude = ["tests", "docs"]
 
 
@@ -55,7 +69,7 @@ exclude = ["tests", "docs"]
 legacy_tox_ini = """
 [tox]
 isolated_build = true
-envlist = py38, py39, py310, py311
+envlist = py38, py39, py310, py311, py312
 
 [testenv]
 allowlist_externals = poetry
@@ -76,29 +90,25 @@ disallow_untyped_decorators = true
 no_implicit_optional = true
 warn_unused_ignores = true
 warn_redundant_casts = true
-exclude = [   
-    'tests'
-]
+exclude = ['tests']
 
 [[tool.mypy.overrides]]
-module= [
-    'google.auth.credentials', 
-    'yaml', 
-    'toml', 
+module = [
+    'google.auth.credentials',
+    'yaml',
+    'toml',
     'boto3',
-    'botocore.exceptions', 
+    'botocore.exceptions',
     'hvac',
     'hvac.exceptions',
     'jsonschema',
-    'jsonschema.exceptions'
+    'jsonschema.exceptions',
 ]
 ignore_missing_imports = true
 
 [tool.coverage.run]
 branch = true
-include = [
-    'config/*'
-]
+include = ['config/*']
 
 [tool.coverage.html]
 directory = 'cover'
@@ -106,10 +116,10 @@ directory = 'cover'
 [tool.pytest.ini_options]
 minversion = "6.0"
 addopts = '--cov --cov-report=html --cov-report term-missing --ruff --mypy --black'
-filterwarnings =[
+filterwarnings = [
     'ignore::pytest.PytestDeprecationWarning',
     'ignore::DeprecationWarning',
-    'ignore::pytest.PytestWarning'
+    'ignore::pytest.PytestWarning',
 ]
 
 [build-system]
diff --git a/tests/test_toml.py b/tests/test_toml.py
index 2d6a1aa..44839cd 100644
--- a/tests/test_toml.py
+++ b/tests/test_toml.py
@@ -78,16 +78,7 @@ def test_load_toml_file():  # type: ignore
     with tempfile.NamedTemporaryFile() as f:
         f.file.write(TOML.encode())
         f.file.flush()
-
-        # Two different toml libraries are in use
-        import sys
-
-        if sys.version_info[1] < 11:
-            read_type = "rt"
-        else:
-            read_type = "rb"
-
-        cfg = config_from_toml(open(f.name, read_type), read_from_file=True)
+        cfg = config_from_toml(open(f.name, "rb"), read_from_file=True)
     assert cfg["a1.b1.c1"] == 1
     assert cfg["a1.b1"].as_dict() == {"c1": 1, "c2": 2, "c3": 3}
     assert cfg["a1.b2"].as_dict() == {"c1": "a", "c2": True, "c3": 1.1}