diff --git a/.github/workflows/CI-pylint.yml b/.github/workflows/CI-pylint.yml
index 127f74b8..58e2276a 100644
--- a/.github/workflows/CI-pylint.yml
+++ b/.github/workflows/CI-pylint.yml
@@ -5,23 +5,27 @@ on:
     branches-ignore:
       - "main-ci"
       - "release"
-  #   pull_request:
-  #     branches:
-  #       - main
+
+  pull_request:
+    branches:
+      - main
 
   workflow_dispatch:
 
 jobs:
   lint:
+    strategy:
+      matrix:
+        python-version: [3.9, 3.10.12, 3.11.0]
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Python 3.11
+      - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
-          python-version: 3.11.0
+          python-version: ${{ matrix.python-version }}
 
       - name: Install Dependencies
         run: |
diff --git a/.github/workflows/CI-tests.yml b/.github/workflows/CI-tests.yml
index 84c91357..8675c049 100644
--- a/.github/workflows/CI-tests.yml
+++ b/.github/workflows/CI-tests.yml
@@ -16,7 +16,7 @@ jobs:
   run_tests:
     strategy:
       matrix:
-        python-version: [3.10.12, 3.11.0]
+        python-version: [3.9, 3.10.12, 3.11.0]
     runs-on: ubuntu-latest
 
     steps:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88c9b11c..5cc92728 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Change Log
 
+## Release 1.3.0 (TBD)
+
+### Changes
+
+- Backwards compatibility with Python >= 3.9
+
+---
+
 ## Release 1.2.6 (10/6/23)
 
 ### Changes
diff --git a/runpod/serverless/modules/rp_fastapi.py b/runpod/serverless/modules/rp_fastapi.py
index 3ead9150..b6a4c32c 100644
--- a/runpod/serverless/modules/rp_fastapi.py
+++ b/runpod/serverless/modules/rp_fastapi.py
@@ -2,6 +2,7 @@
 # pylint: disable=too-few-public-methods
 
 import os
+from typing import Union
 
 import uvicorn
 from fastapi import FastAPI, APIRouter
@@ -37,7 +38,7 @@
 class Job(BaseModel):
     ''' Represents a job. '''
     id: str
-    input: dict | list | str | int | float | bool
+    input: Union[dict, list, str, int, float, bool]
 
 
 class TestJob(BaseModel):
@@ -45,7 +46,7 @@ class TestJob(BaseModel):
     input can be any type of data.
     '''
     id: str = "test_job"
-    input: dict | list | str | int | float | bool
+    input: Union[dict, list, str, int, float, bool]
 
 
 class WorkerAPI:
diff --git a/setup.cfg b/setup.cfg
index 08245287..c32c3f3e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -27,7 +27,7 @@ classifiers =
 [options]
 include_package_data = true
 packages = find:
-python_requires = >= 3.10
+python_requires = >= 3.9
 install_requires =
     aiohttp >= 3.8.4
     aiohttp-retry >= 2.8.3
diff --git a/tests/test_serverless/test_utils/test_debugger.py b/tests/test_serverless/test_utils/test_debugger.py
index 808a429a..2073757a 100644
--- a/tests/test_serverless/test_utils/test_debugger.py
+++ b/tests/test_serverless/test_utils/test_debugger.py
@@ -104,6 +104,11 @@ def test_clear_debugger_output(self):
         '''
         self.checkpoints.add('checkpoint1')
         self.checkpoints.start('checkpoint1')
+
+        # Check that non-stopped checkpoints are not returned
+        checkpoint_list = self.checkpoints.get_checkpoints()
+        self.assertEqual(len(checkpoint_list), 0)
+
         self.checkpoints.stop('checkpoint1')
 
         checkpoint_list = self.checkpoints.get_checkpoints()