diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fcfa669..1836341 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: windows-latest  # matches your local environment
+    runs-on: windows-latest # matches your local environment
     env:
       PYTHONIOENCODING: utf-8
     steps:
@@ -20,6 +20,7 @@ jobs:
           cache: "pip"
 
       - name: Install deps
+        shell: bash
         run: |
           python -m pip install --upgrade pip
           if [ -f requirements.txt ]; then pip install -r requirements.txt; else pip install numpy pandas statsmodels matplotlib scipy; fi
@@ -31,12 +32,6 @@ jobs:
       - name: Tests
         run: make test
 
-      - name: Lint
-        run: make lint
-
-      - name: Tests
-        run: make test
-
       - name: Tiny Chapter 13 smoke
         run: make ch13-ci
 
@@ -46,4 +41,4 @@ jobs:
         with:
           name: ch13-plots
           path: outputs/
-          if-no-files-found: ignore
+          if-no-files-found: ignore
\ No newline at end of file