diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 71b2da9..f82323a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -46,17 +46,18 @@ jobs:
   lint-python:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
+
       - name: Setup python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.12
 
       - name: Install dependencies
-        run: pip install --pre flake8==4.0.1 black==22.3.0
+        run: pip install ruff
 
-      - uses: actions/checkout@v4
-      - run: flake8
-      - run: black --check .
+      - run: ruff check .
+      - run: ruff format --check .
 
   test-python:
     runs-on: ubuntu-latest
@@ -71,13 +72,13 @@ jobs:
       - name: Setup python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.8
+          python-version: 3.12
 
       # Keep boto version in sync with what is installed inside of the Python
-      # 3.8 lambda. See the link below for reference.
+      # 3.12 lambda. See the link below for reference.
       # https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html
       - name: Install dependencies
-        run: pip install boto3==1.20.32 botocore==1.23.32
+        run: pip install boto3==1.34.95
 
       - uses: actions/checkout@v4
       - run: python -m tests
diff --git a/README.md b/README.md
index 254c37c..918c6ee 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ module "codepipeline_notifications" {
 | <a name="input_label_key_case"></a> [label\_key\_case](#input\_label\_key\_case) | The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`.<br>Possible values: `lower`, `title`, `upper`.<br>Default value: `title`. | `string` | `null` | no |
 | <a name="input_label_order"></a> [label\_order](#input\_label\_order) | The naming order of the id output and Name tag.<br>Defaults to ["namespace", "environment", "stage", "name", "attributes"].<br>You can omit any of the 5 elements, but at least one must be present. | `list(string)` | `null` | no |
 | <a name="input_label_value_case"></a> [label\_value\_case](#input\_label\_value\_case) | The letter case of output label values (also used in `tags` and `id`).<br>Possible values: `lower`, `title`, `upper` and `none` (no transformation).<br>Default value: `lower`. | `string` | `null` | no |
-| <a name="input_lambda_runtime"></a> [lambda\_runtime](#input\_lambda\_runtime) | The runtime to use for the lambda function | `string` | `"python3.8"` | no |
+| <a name="input_lambda_runtime"></a> [lambda\_runtime](#input\_lambda\_runtime) | The runtime to use for the lambda function | `string` | `"python3.12"` | no |
 | <a name="input_name"></a> [name](#input\_name) | Solution name, e.g. 'app' or 'jenkins' | `string` | `null` | no |
 | <a name="input_namespace"></a> [namespace](#input\_namespace) | Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' | `string` | `null` | no |
 | <a name="input_pipeline_event_type_ids"></a> [pipeline\_event\_type\_ids](#input\_pipeline\_event\_type\_ids) | The list of pipeline events to trigger a notification on | `list(string)` | <pre>[<br>  "started",<br>  "failed",<br>  "canceled",<br>  "resumed",<br>  "succeeded",<br>  "superseded"<br>]</pre> | no |
diff --git a/lambdas/notifier/notifier.py b/lambdas/notifier/notifier.py
index a7f6713..c73ed18 100644
--- a/lambdas/notifier/notifier.py
+++ b/lambdas/notifier/notifier.py
@@ -1,7 +1,6 @@
 import json
 import logging
 import os
-import typing as t
 import urllib
 import urllib.request
 
@@ -39,8 +38,8 @@ def format_slack_attachment(
     environment: str,
     region: str,
     action: str,
-    revision_summary: t.Optional[str],
-    revision_url: t.Optional[str],
+    revision_summary: str | None,
+    revision_url: str | None,
 ) -> dict:
     execution_link = (
         f"<https://{region}.console.aws.amazon.com/codesuite/codepipeline/"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 2bcd70e..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-[flake8]
-max-line-length = 88
diff --git a/variables.tf b/variables.tf
index 3f617d9..72656d5 100644
--- a/variables.tf
+++ b/variables.tf
@@ -82,5 +82,5 @@ variable "approval_event_type_ids" {
 variable "lambda_runtime" {
   type        = string
   description = "The runtime to use for the lambda function"
-  default     = "python3.8"
+  default     = "python3.12"
 }