diff --git a/.github/workflows/build_and_publish.yml b/.github/workflows/build_and_publish.yml
index 64ebcf8..986acad 100644
--- a/.github/workflows/build_and_publish.yml
+++ b/.github/workflows/build_and_publish.yml
@@ -21,7 +21,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.11'
           architecture: 'x64'
 
       - name: Restore dependency cache
diff --git a/Makefile b/Makefile
index 390346e..1790f2f 100644
--- a/Makefile
+++ b/Makefile
@@ -58,7 +58,7 @@ clean-env: ## remove environment
 lint: ## static code analysis
 	black --line-length 120 --check fixdatalink tests
 	flake8 fixdatalink
-	mypy --python-version 3.9 --strict fixdatalink tests
+	mypy --python-version 3.11 --strict fixdatalink tests
 
 test: ## run tests quickly with the default Python
 	pytest
diff --git a/pyproject.toml b/pyproject.toml
index 14777a4..e3718c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ version = "2.0.2"
 authors = [{name="Some Engineering Inc."}]
 description = "Data Pipelines for Fix infrastructure data."
 license = {file="LICENSE"}
-requires-python = ">=3.9"
+requires-python = ">=3.11"
 classifiers = [
     # Current project status
     "Development Status :: 4 - Beta",
@@ -14,7 +14,7 @@ classifiers = [
     # License information
     "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
     # Supported python versions
-    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.11",
     # Supported OS's
     "Operating System :: POSIX :: Linux",
     "Operating System :: Unix",
diff --git a/tox.ini b/tox.ini
index 6491070..05f9a8e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,4 +23,4 @@ commands = black --line-length 120 --check --diff --target-version py39 .
 
 [testenv:mypy]
 commands=
-  python -m mypy --python-version 3.9 fixdatalink tests
+  python -m mypy --python-version 3.11 fixdatalink tests