diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 71b2da9..e1b68b0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,16 +47,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - 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.
       # 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/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/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"
 }