diff --git a/.github/workflows/python-poetry-package.yml b/.github/workflows/python-poetry-package.yml
index 0ede31f..dd7019c 100644
--- a/.github/workflows/python-poetry-package.yml
+++ b/.github/workflows/python-poetry-package.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.10", "3.11", "3.12"]
+        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index ab9f4d3..25451d0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ include = ["CHANGELOG.md"]
 license = "GPL-3.0-only"
 
 [tool.poetry.dependencies]
-python = ">=3.10,<4.0"
+python = ">=3.8,<4.0"
 spond = ">=1.0.0"
 pydantic = ">=2.7.1"
 
@@ -53,10 +53,17 @@ ignore = ["COM812", "ISC001", "D205"]
 #   F841 Local variable is assigned to but never used (triggered by testing raises)
 "**/{tests}/*" = ["S101", "F841"]
 
-# Ignore rules that conflict with Mypy
+# Ignore rules that conflict with Mypy:
 #   PLC0414 Import alias does not rename original package
 "__init__.py" = ["PLC0414"]
 
+# Ignore rules that conflict with Pydantic:
+#   TCH001 Move application import ... into a type-checking block
+#   TCH003 Move standard library import ... into a type-checking block
+"event.py" = ["TCH003"]  # `datetime.datetime`
+"group.py" = ["TCH001"]  # `.member.Member`
+"member.py" = ["TCH001", "TCH003"]  # `.profile.Profile`, `datetime.datetime`
+
 [tool.ruff.lint.pydocstyle]
 convention = "numpy"
 
diff --git a/spond_classes/event.py b/spond_classes/event.py
index 6f92e95..cfb2d08 100644
--- a/spond_classes/event.py
+++ b/spond_classes/event.py
@@ -1,5 +1,7 @@
 """Module containing `Event` class and nested `EventType`,`Responses` classes."""
 
+from __future__ import annotations
+
 from datetime import datetime
 from enum import Enum
 
diff --git a/spond_classes/group.py b/spond_classes/group.py
index 01fd700..6356c14 100644
--- a/spond_classes/group.py
+++ b/spond_classes/group.py
@@ -1,5 +1,7 @@
 """Module containing `Group` class."""
 
+from __future__ import annotations
+
 from pydantic import BaseModel, Field
 
 from .member import Member
diff --git a/spond_classes/member.py b/spond_classes/member.py
index 4ed5af3..eaf9e3a 100644
--- a/spond_classes/member.py
+++ b/spond_classes/member.py
@@ -1,5 +1,7 @@
 """Module containing `Member` class."""
 
+from __future__ import annotations
+
 from datetime import datetime
 
 from pydantic import BaseModel, Field