diff --git a/.github/workflows/publish-release.yml b/.github/workflows/publish-release.yml
index 238e404..b23b71a 100644
--- a/.github/workflows/publish-release.yml
+++ b/.github/workflows/publish-release.yml
@@ -61,7 +61,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: '3.8'
+        python-version: '3.11'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 4749644..ddc8886 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: ['3.10', '3.11', '3.12']
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/README.md b/README.md
index ba52c45..c405f3c 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ It is a package that supports common utils used by FOSSLight Scanner.
 
 ## 📋 Prerequisite
 
-FOSSLight Util needs a Python 3.6+.
+FOSSLight Util needs a Python 3.10+.
 
 ## 🎉 How to install
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 54813f0..b59e49c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,6 +1,6 @@
-tox>=4.18.1
+tox
 pytest
 pytest-cov
 pytest-flake8
-flake8==3.9.2
+flake8
 fosslight-source
diff --git a/requirements.txt b/requirements.txt
index 36a0e0b..6593fc1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,8 +10,7 @@ beautifulsoup4
 jsonmerge
 spdx-tools==0.8.*;sys_platform=="linux"
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
-numpy; python_version < '3.8'
-numpy>=1.22.2; python_version >= '3.8'
+numpy
 requests
 GitPython
 cyclonedx-python-lib==8.5.*;sys_platform=="linux"
diff --git a/setup.py b/setup.py
index 0dc74e6..9086313 100644
--- a/setup.py
+++ b/setup.py
@@ -26,17 +26,12 @@
         download_url='https://github.com/fosslight/fosslight_util',
         classifiers=['License :: OSI Approved :: Apache Software License',
                      "Programming Language :: Python :: 3",
-                     "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",
-                     "Programming Language :: Python :: 3.11", ],
+                     "Programming Language :: Python :: 3.11",
+                     "Programming Language :: Python :: 3.12", ],
         install_requires=required,
         package_data={'fosslight_util': ['resources/frequentLicenselist.json', 'resources/licenses.json']},
         include_package_data=True,
-        extras_require={":python_version<'3.7'": ["pygit2==1.6.1"],
-                        ":python_version>='3.7'": ["pygit2>=1.10.1"]},
         entry_points={
             "console_scripts": [
                 "fosslight_download = fosslight_util.download:main",