diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 0831dd5..b1b6d78 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -19,26 +19,26 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          # - ubuntu-latest
-          - ubuntu-20.04
+          - ubuntu-latest
           # - windows
           # - MacOs
         py:
+          - "3.12"
           - "3.11"
           - "3.10"
           - "3.9"
           - "3.8"
-          - "3.7"
-          - "3.6"
     steps:
       - uses: actions/checkout@v4
       - name: Setup python for test ${{ matrix.py }}
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.py }}
+          cache: 'pip'
+          cache-dependency-path: setup.py
 
       - name: Initialize
         run: make init
 
-      - name: Setup test suite
+      - name: Run test cases
         run: make test
diff --git a/setup.py b/setup.py
index ab36db4..44e6c1c 100644
--- a/setup.py
+++ b/setup.py
@@ -35,15 +35,14 @@
             "excel2xx=excel2xx.main:main_docopt",
         ],
     },
-    python_requires=">=3.6,!=3.6.1",
+    # python_requires=">=3.6,!=3.6.1",
+    python_requires=">=3.8",
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "Intended Audience :: Developers",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",