diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d6162fd..601f78e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,8 +22,14 @@ jobs:
       - name: Install deps
         run: |
           python -m pip install --upgrade pip
-          pip install -r requirements.txt || echo "No requirements.txt; skipping"
-          pip install numpy pandas statsmodels matplotlib scipy
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; else pip install numpy pandas statsmodels matplotlib scipy; fi
+          if [ -f requirements-dev.txt ]; then pip install -r requirements-dev.txt; fi
+
+      - name: Lint
+        run: make lint
+
+      - name: Tests
+        run: make test
 
       - name: Tiny Chapter 13 smoke
         run: make ch13-ci