diff --git a/.github/workflows/python-build.yml b/.github/workflows/python-build.yml
index ca8dfcf..04fe8f2 100644
--- a/.github/workflows/python-build.yml
+++ b/.github/workflows/python-build.yml
@@ -18,5 +18,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install Tox and any other packages
       run: pip install tox
-    - name: Run Tox
+    - name: Run Tox (pydantic latest)
       run: tox -e py
+    - name: Run Tox (pydantic v1)
+      run: tox -e pydanticv1
diff --git a/tox.ini b/tox.ini
index f37809e..f26d573 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,20 @@ commands =
     pytest -x -n 8 {posargs}
     mypy --ignore-missing-imports --check-untyped-defs --show-error-codes --follow-imports silent service_capacity_modeling tests
 
+[testenv:pydanticv1]
+deps =
+    pydantic<2.0
+    pytest
+    pytest-xdist
+    mypy
+    pylint
+    ipdb
+    isodate
+commands =
+    pytest -x -n 8 {posargs}
+    mypy --ignore-missing-imports --check-untyped-defs --show-error-codes --follow-imports silent service_capacity_modeling tests
+
+
 [testenv:dev]
 envdir = .tox/dev
 basepython=python3.8