diff --git a/pycfmodel/model/cf_model.py b/pycfmodel/model/cf_model.py
index ff9acef..40f973a 100644
--- a/pycfmodel/model/cf_model.py
+++ b/pycfmodel/model/cf_model.py
@@ -1,7 +1,8 @@
 from datetime import date
-from typing import Annotated, Any, ClassVar, Collection, Dict, List, Optional, Type, Union
+from typing import Any, ClassVar, Collection, Dict, List, Optional, Type, Union
 
 from pydantic import Field
+from typing_extensions import Annotated
 
 from pycfmodel.action_expander import expand_actions
 from pycfmodel.constants import AWS_NOVALUE
diff --git a/pycfmodel/model/types.py b/pycfmodel/model/types.py
index c10f7c9..3fad653 100644
--- a/pycfmodel/model/types.py
+++ b/pycfmodel/model/types.py
@@ -2,7 +2,7 @@
 from base64 import b64decode
 from datetime import date, datetime
 from ipaddress import IPv4Network, IPv6Network
-from typing import Any, List, TypeVar, Union
+from typing import Any, List, TypeVar, Union, Type
 
 from pydantic import BeforeValidator, Field, GetCoreSchemaHandler
 from pydantic._internal import _schema_generation_shared
@@ -30,7 +30,7 @@ def __get_pydantic_json_schema__(
     @classmethod
     def __get_pydantic_core_schema__(
         cls,
-        _source: type[Any],
+        _source: Type[Any],
         _handler: GetCoreSchemaHandler,
     ) -> core_schema.CoreSchema:
         return core_schema.no_info_plain_validator_function(
@@ -59,7 +59,7 @@ def __get_pydantic_json_schema__(
     @classmethod
     def __get_pydantic_core_schema__(
         cls,
-        _source: type[Any],
+        _source: Type[Any],
         _handler: GetCoreSchemaHandler,
     ) -> core_schema.CoreSchema:
         return core_schema.no_info_plain_validator_function(
@@ -97,7 +97,7 @@ def __get_pydantic_json_schema__(
     @classmethod
     def __get_pydantic_core_schema__(
         cls,
-        _source: type[Any],
+        _source: Type[Any],
         _handler: GetCoreSchemaHandler,
     ) -> core_schema.CoreSchema:
         return core_schema.no_info_plain_validator_function(
diff --git a/requirements-dev.txt b/requirements-dev.txt
index cd6333f..fce7de1 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with Python 3.12
+# This file is autogenerated by pip-compile with Python 3.8
 # by the following command:
 #
 #    make freeze
@@ -11,10 +11,12 @@ build==1.2.1
 certifi==2024.6.2
 click==8.1.7
 coverage[toml]==7.5.3
+exceptiongroup==1.2.1
 h11==0.14.0
 httpcore==1.0.5
 httpx==0.27.0
 idna==3.7
+importlib-metadata==7.1.0
 iniconfig==2.0.0
 isort==5.13.2
 mypy-extensions==1.0.0
@@ -31,8 +33,10 @@ pytest-cov==5.0.0
 pytest-repeat==0.9.3
 ruff==0.4.8
 sniffio==1.3.1
+tomli==2.0.1
 typing-extensions==4.12.2
 wheel==0.43.0
+zipp==3.19.2
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip
diff --git a/requirements-docs.txt b/requirements-docs.txt
index 6055e5a..8079a9f 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with Python 3.12
+# This file is autogenerated by pip-compile with Python 3.8
 # by the following command:
 #
 #    make freeze
diff --git a/requirements.txt b/requirements.txt
index 5701176..25d90a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with Python 3.12
+# This file is autogenerated by pip-compile with Python 3.8
 # by the following command:
 #
 #    make freeze