diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 45df004..70752f5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -21,7 +21,7 @@ jobs:
           cache: 'pip'
 
       - name: Install dependencies
-        run: pip install -e ".[tests]"
+        run: pip install -e ".[tests,linkml]"
 
       - name: Run Tests
         run: pytest