diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e7ff741d..97f8e33f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,15 +14,15 @@ jobs:
         include:
           - { python: "3.12", os: "ubuntu-latest", session: "pre-commit" }
           - { python: "3.12", os: "ubuntu-latest", session: "safety" }
+          #          - { python: "3.12", os: "ubuntu-latest", session: "mypy" }
           #          - { python: "3.11", os: "ubuntu-latest", session: "mypy" }
           #          - { python: "3.10", os: "ubuntu-latest", session: "mypy" }
-          #          - { python: "3.9", os: "ubuntu-latest", session: "mypy" }
           - { python: "3.12", os: "ubuntu-latest", session: "tests" }
           - { python: "3.11", os: "ubuntu-latest", session: "tests" }
           - { python: "3.10", os: "ubuntu-latest", session: "tests" }
-          - { python: "3.9", os: "ubuntu-latest", session: "tests" }
           - { python: "3.12", os: "windows-latest", session: "tests" }
           - { python: "3.12", os: "macos-latest", session: "tests" }
+          #          - { python: "3.12", os: "ubuntu-latest", session: "typeguard" }
           #          - { python: "3.11", os: "ubuntu-latest", session: "typeguard" }
           #          - { python: "3.10", os: "ubuntu-latest", session: "typeguard" }
           #          - { python: "3.10", os: "ubuntu-latest", session: "xdoctest" }
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 24ef01d3..daf3f96d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -37,7 +37,7 @@ Request features on the [Issue Tracker].
 
 ## How to set up your development environment
 
-You need Python 3.9+ and the following tools:
+You need Python 3.10+ and the following tools:
 
 - [Poetry]
 - [Nox]
diff --git a/noxfile.py b/noxfile.py
index c7fab77d..7c83102d 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -24,7 +24,7 @@
 
 
 package = "mdio"
-python_versions = ["3.12", "3.11", "3.10", "3.9"]
+python_versions = ["3.12", "3.11", "3.10"]
 nox.needs_version = ">= 2022.1.7"
 nox.options.sessions = (
     "pre-commit",