diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c5b15c2..33749d0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,9 +14,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Pixi
-        uses: prefix-dev/setup-pixi@v0.8.1
+        uses: prefix-dev/setup-pixi@v0.9.4
         with:
-          pixi-version: v0.25.0
+          pixi-version: v0.66.0
 
       - name: Run Tests
         run: pixi run pytest tests/ -v --cov=pypsa_validation_processing --cov-report=xml