diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a5618a489..ab984542f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,6 +18,23 @@ jobs:
         uses: actions/setup-python@v2
       - name: Run pre-commit
         uses: pre-commit/action@v2.0.3
+  
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - "3.9"
+          - "3.10"
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v2
+      - name: Setup Pixi
+        uses: prefix-dev/setup-pixi@v0.3.0
+      - name: Setup older Python versions
+        run: pixi add python=${{ matrix.python-version }} 
+      - name: Run Tests
+        run: pixi run test
 
   build:
     runs-on: ubuntu-latest
diff --git a/xugrid/ugrid/interpolate.py b/xugrid/ugrid/interpolate.py
index d6ea05944..c29602d17 100644
--- a/xugrid/ugrid/interpolate.py
+++ b/xugrid/ugrid/interpolate.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import warnings
 
 import numpy as np