diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 770dfba4..8a082da7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,6 +17,12 @@ jobs:
       matrix:
         # Checks based on python versions ---
         python-version: ['3.9', '3.10']
+        requirements: [""]
+
+        include:
+          - name: "pydantic v1"
+            requirements: "pydantic<2.0.0"
+            python-version: "3.10"
 
     steps:
       - uses: actions/checkout@v2
@@ -26,7 +32,13 @@ jobs:
       - name: Install dev dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install ".[dev]"
+
+          # include requirements if specified
+          if [ -n "$REQUIREMENTS" ]; then
+            python -m pip install $REQUIREMENTS '.[dev]'
+          else
+            python -m pip install '.[dev]'
+          fi
       - name: Run tests
         run: |
           pytest