diff --git a/aiopenapi3/version.py b/aiopenapi3/version.py
index 6a9beea8..36370558 100644
--- a/aiopenapi3/version.py
+++ b/aiopenapi3/version.py
@@ -1 +1 @@
-__version__ = "0.4.0"
+__version__ = "0.5.0a1"
diff --git a/pyproject.toml b/pyproject.toml
index 77f46a90..9a063348 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
 ]
 dynamic = ['version']