diff --git a/.github/workflows/lint-and-unit-tests.yml b/.github/workflows/lint-and-unit-tests.yml
index fe3d3e4..ab64d41 100644
--- a/.github/workflows/lint-and-unit-tests.yml
+++ b/.github/workflows/lint-and-unit-tests.yml
@@ -17,9 +17,10 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - "3.6"
           - "3.8"
           - "3.9"
+          - "3.10"
+          - "3.11"
     steps:
       - uses: actions/checkout@v3
 
diff --git a/requirements.txt b/requirements.txt
index 71f3f5d..e8d2b26 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 # python-ldap 3.4.1 adds support for openldap 2.5+
 python-ldap>=3.4.0,<3.5.0
 # cachetools:
-#   - 3 requires python3.4+; 4 requires python3.5+; 5 requires python3.7+
-#   - 3 adds python3.7 support; 3.1 adds python3.8; 4.2 adds python3.9;
+#   - 3.1 adds python3.8
+#   - 4.2 adds python3.9
 #   - 5.2.1 adds python3.11
-cachetools>=2.0.1,<5.4.0
+cachetools>=3.1,<5.4.0
diff --git a/setup.py b/setup.py
index 3172b4c..6319f82 100644
--- a/setup.py
+++ b/setup.py
@@ -40,9 +40,10 @@
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         '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",
         'Environment :: Console',
     ],
     platforms=['Any'],
diff --git a/tox.ini b/tox.ini
index 533e07a..8cb7d31 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py36,lint
+envlist = py38,py39,py310,py311,lint
 
 [testenv]
 deps = -r{toxinidir}/requirements.txt