diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index af96204..3977ef9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,16 +12,16 @@ on:
 jobs:
   test:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
diff --git a/README.md b/README.md
index 6cf75fb..7b76c3e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # pyCFClient
 
-A python client library for ChannelFinder. Requires python >= 3.8.
+A python client library for ChannelFinder.
 
 ## Configuration
 
diff --git a/pyproject.toml b/pyproject.toml
index 6aa50e1..6182786 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
 
 [project]
 name = "channelfinder"
@@ -10,7 +10,7 @@ authors = [
 ]
 description = "Python ChannelFinder Client Lib"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.6"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: MIT License",
@@ -22,7 +22,7 @@ dependencies = [
     "urllib3>=1.22"
     ]
 [project.optional-dependencies]
-test = ["pytest", "testcontainers==3.7.1"]
+test = ["pytest", "testcontainers>=3.7.0,<4"]
 
 [project.urls]
 Homepage = "https://github.com/ChannelFinderService/pyCFClient"
@@ -30,4 +30,4 @@ Issues = "https://github.com/ChannelFinderService/pyCFClient/issues"
 
 [project.scripts]
 cf-update-ioc = "channelfinder.cfUpdate.CFUpdateIOC:main"
-cf-monitor-test = "channelfinder.cfMonitorTest:main"
\ No newline at end of file
+cf-monitor-test = "channelfinder.cfMonitorTest:main"