diff --git a/.github/workflows/integration_tests.yml b/.github/workflows/integration_tests.yml
index 252dc88..bb49ab9 100644
--- a/.github/workflows/integration_tests.yml
+++ b/.github/workflows/integration_tests.yml
@@ -12,10 +12,12 @@ jobs:
       fail-fast: false
       matrix:
         psql_version: ['12.13', '13.9', '14.4', '15.1']
-        python_version: ['3.8', '3.9', '3.10']
+        python_version: ['3.6', '3.8', '3.9', '3.10']
 
+    # Python 3.6 is not available on ubuntu-22.04
+    # see: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json
     name: PostgreSQL ${{ matrix.psql_version }} and Python ${{ matrix.python_version }} integration test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - name: Checkout source code
diff --git a/setup.cfg b/setup.cfg
index 867208a..a7d0bfc 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,7 +23,7 @@ classifiers =
 package_dir =
     = src
 packages = find:
-python_requires = >= 3.8
+python_requires = >= 3.6
 
 install_requires =
   graphviz