diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..26ff089
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: pip install -r requirements.txt
+    - name: Run tests
+      run: make test
+    - name: Lint check (optional)
+      run: |
+        python -m py_compile $(find . -name "*.py" | grep -v __pycache__)
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 03f0840..809a3f7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,15 +11,15 @@ jsonschema==4.19.0
 jsonschema-specifications==2024.10.1
 MarkupSafe==3.0.2
 packaging==24.2
-pillow==12.3.0
+pillow>=10.0.0
 pluggy==1.5.0
 PyJWT==2.15.0
-pytest==9.0.3
-pytest-html-reporter==0.2.9
+pytest<9.0
+pytest-html-reporter>=0.2.10
 pytest-metadata==3.1.1
 pytest-xdist==3.3.1
 referencing==0.36.2
-requests==2.33.0
+requests>=2.32.0,<2.33.0
 responses==0.24.1
 rpds-py==0.24.0
 urllib3==2.8.0