diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 813748a..9afe5a4 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -6,23 +6,33 @@ on:
       - master
     tags:
       - "**"
+  pull_request:
+    branches:
+      - master
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    name: lint ${{ matrix.os }} / ${{ matrix.python-version }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu]
+        python-version: ["3.9", "3.10", "3.11", "pypy3.8", "pypy3.9"]
+
+    env:
+      PYTHON: ${{ matrix.python-version }}
+      OS: ${{ matrix.os }}
+      DEPS: yes
 
-    defaults:
-      run:
-        working-directory: ./pydantic_br
+    runs-on: ${{ matrix.os }}-latest
 
     steps:
-      - name: Action Checkout
-        uses: actions/checkout@v3
+      - uses: actions/checkout@v3
 
-      - name: Set up Python
+      - name: set up python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.9"
+          python-version: ${{ matrix.python-version }}
 
       - name: Install Poetry
         uses: Gr1N/setup-poetry@v8