diff --git a/.github/workflows/run_tests.yml b/.github/workflows/run_tests.yml
index 2ffb74d..aeb4e5b 100644
--- a/.github/workflows/run_tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -9,3 +9,5 @@ jobs:
     - uses: s-weigand/setup-conda@v1
     - run: conda --version
     - run: which python
+    - run: conda install lxml tixi3 -c dlr-sc
+    - run: pytest