diff --git a/alembic/versions/b65796c99771_squash.py b/alembic/versions/b65796c99771_squash.py
index 2132a3e..0f2a62d 100644
--- a/alembic/versions/b65796c99771_squash.py
+++ b/alembic/versions/b65796c99771_squash.py
@@ -5,6 +5,7 @@
 Create Date: 2023-07-06 22:17:36.160486
 
 """
+
 import sqlalchemy as sa
 from sqlalchemy import text
 from sqlalchemy.dialects import postgresql
diff --git a/docs/conf.py b/docs/conf.py
index a3155fb..fe9d2b9 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,4 +1,5 @@
 """Configuration file for the Sphinx documentation builder."""
+
 import os
 from importlib import metadata
 from unittest.mock import patch
diff --git a/poetry.lock b/poetry.lock
index dfe4066..68488bd 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1070,37 +1070,35 @@ files = [
 
 [[package]]
 name = "fastapi"
-version = "0.95.2"
+version = "0.110.1"
 description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "fastapi-0.95.2-py3-none-any.whl", hash = "sha256:d374dbc4ef2ad9b803899bd3360d34c534adc574546e25314ab72c0c4411749f"},
-    {file = "fastapi-0.95.2.tar.gz", hash = "sha256:4d9d3e8c71c73f11874bcf5e33626258d143252e329a01002f767306c64fb982"},
+    {file = "fastapi-0.110.1-py3-none-any.whl", hash = "sha256:5df913203c482f820d31f48e635e022f8cbfe7350e4830ef05a3163925b1addc"},
+    {file = "fastapi-0.110.1.tar.gz", hash = "sha256:6feac43ec359dfe4f45b2c18ec8c94edb8dc2dfc461d417d9e626590c071baad"},
 ]
 
 [package.dependencies]
-pydantic = ">=1.6.2,<1.7 || >1.7,<1.7.1 || >1.7.1,<1.7.2 || >1.7.2,<1.7.3 || >1.7.3,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0"
-starlette = ">=0.27.0,<0.28.0"
+pydantic = ">=1.7.4,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0 || >2.0.0,<2.0.1 || >2.0.1,<2.1.0 || >2.1.0,<3.0.0"
+starlette = ">=0.37.2,<0.38.0"
+typing-extensions = ">=4.8.0"
 
 [package.extras]
-all = ["email-validator (>=1.1.1)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "python-multipart (>=0.0.5)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]
-dev = ["pre-commit (>=2.17.0,<3.0.0)", "ruff (==0.0.138)", "uvicorn[standard] (>=0.12.0,<0.21.0)"]
-doc = ["mdx-include (>=1.4.1,<2.0.0)", "mkdocs (>=1.1.2,<2.0.0)", "mkdocs-markdownextradata-plugin (>=0.1.7,<0.3.0)", "mkdocs-material (>=8.1.4,<9.0.0)", "pyyaml (>=5.3.1,<7.0.0)", "typer-cli (>=0.0.13,<0.0.14)", "typer[all] (>=0.6.1,<0.8.0)"]
-test = ["anyio[trio] (>=3.2.1,<4.0.0)", "black (==23.1.0)", "coverage[toml] (>=6.5.0,<8.0)", "databases[sqlite] (>=0.3.2,<0.7.0)", "email-validator (>=1.1.1,<2.0.0)", "flask (>=1.1.2,<3.0.0)", "httpx (>=0.23.0,<0.24.0)", "isort (>=5.0.6,<6.0.0)", "mypy (==0.982)", "orjson (>=3.2.1,<4.0.0)", "passlib[bcrypt] (>=1.7.2,<2.0.0)", "peewee (>=3.13.3,<4.0.0)", "pytest (>=7.1.3,<8.0.0)", "python-jose[cryptography] (>=3.3.0,<4.0.0)", "python-multipart (>=0.0.5,<0.0.7)", "pyyaml (>=5.3.1,<7.0.0)", "ruff (==0.0.138)", "sqlalchemy (>=1.3.18,<1.4.43)", "types-orjson (==3.6.2)", "types-ujson (==5.7.0.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0)"]
+all = ["email-validator (>=2.0.0)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "pydantic-extra-types (>=2.0.0)", "pydantic-settings (>=2.0.0)", "python-multipart (>=0.0.7)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]
 
 [[package]]
 name = "fastapimsal"
-version = "0.4.8"
+version = "0.4.9"
 description = "Library to authenticate users using MSAL"
 optional = false
-python-versions = "^3.7"
+python-versions = "^3.8"
 files = []
 develop = false
 
 [package.dependencies]
 async_lru = "^1.0.2"
-fastapi = "^0.95.0"
+fastapi = "^0.110.1"
 httpx = "^0.23"
 itsdangerous = "^1.1.0"
 msal = "^1.10.0"
@@ -1111,8 +1109,8 @@ uvicorn = {version = "^0.17.6", extras = ["standard"]}
 [package.source]
 type = "git"
 url = "https://github.com/alan-turing-institute/fastapimsal"
-reference = "0.4.8"
-resolved_reference = "92e0d1cb7c127d9964f88013ea7126a85b6ac310"
+reference = "0.4.9"
+resolved_reference = "7a836c94f2a90dbc0e52507207f3753b0d5179c5"
 
 [[package]]
 name = "filelock"
@@ -2222,52 +2220,49 @@ files = [
 
 [[package]]
 name = "mypy"
-version = "0.991"
+version = "1.9.0"
 description = "Optional static typing for Python"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
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+    {file = "mypy-1.9.0-cp39-cp39-win_amd64.whl", hash = "sha256:571741dc4194b4f82d344b15e8837e8c5fcc462d66d076748142327626a1b6e9"},
+    {file = "mypy-1.9.0-py3-none-any.whl", hash = "sha256:a260627a570559181a9ea5de61ac6297aa5af202f06fd7ab093ce74e7181e43e"},
+    {file = "mypy-1.9.0.tar.gz", hash = "sha256:3cc5da0127e6a478cddd906068496a97a7618a21ce9b54bde5bf7e539c7af974"},
 ]
 
 [package.dependencies]
-mypy-extensions = ">=0.4.3"
+mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = ">=3.10"
+typing-extensions = ">=4.1.0"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
 install-types = ["pip"]
-python2 = ["typed-ast (>=1.4.0,<2)"]
+mypyc = ["setuptools (>=50)"]
 reports = ["lxml"]
 
 [[package]]
@@ -4059,20 +4054,20 @@ files = [
 
 [[package]]
 name = "starlette"
-version = "0.27.0"
+version = "0.37.2"
 description = "The little ASGI library that shines."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "starlette-0.27.0-py3-none-any.whl", hash = "sha256:918416370e846586541235ccd38a474c08b80443ed31c578a418e2209b3eef91"},
-    {file = "starlette-0.27.0.tar.gz", hash = "sha256:6a6b0d042acb8d469a01eba54e9cda6cbd24ac602c4cd016723117d6a7e73b75"},
+    {file = "starlette-0.37.2-py3-none-any.whl", hash = "sha256:6fe59f29268538e5d0d182f2791a479a0c64638e6935d1c6989e63fb2699c6ee"},
+    {file = "starlette-0.37.2.tar.gz", hash = "sha256:9af890290133b79fc3db55474ade20f6220a364a0402e0b556e7cd5e1e093823"},
 ]
 
 [package.dependencies]
 anyio = ">=3.4.0,<5"
 
 [package.extras]
-full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart", "pyyaml"]
+full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart (>=0.0.7)", "pyyaml"]
 
 [[package]]
 name = "tenacity"
@@ -4512,4 +4507,4 @@ docs = ["myst-parser", "sphinx-rtd-theme", "sphinxcontrib-napoleon"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.10 <3.12"
-content-hash = "0fcd7f0ed82f4e78662c7a74d3ff15bd3fcddfc2f83ebc9125743913b1ac6da5"
+content-hash = "e59935b080f0778817f9651e337d8581c7bd8e6bd7fcb48f83a320cd2d7b96f6"
diff --git a/pyproject.toml b/pyproject.toml
index 0bd720c..368220d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,9 +10,8 @@ alembic = "^1.7.1"
 asyncpg = "^0.27.0"
 azure-identity = "^1.16.0"
 databases = { version = "^0.6.2", extras = ["postgresql"] }
-#fastapi = "^0.110.1"
-fastapi = "^0.95.0"
-fastapimsal = { git = "https://github.com/alan-turing-institute/fastapimsal", tag = "0.4.8" }
+fastapi = "^0.110.1"
+fastapimsal = { git = "https://github.com/alan-turing-institute/fastapimsal", tag = "0.4.9" }
 Jinja2 = "^3.1.3"
 opencensus-ext-azure = "^1.1.7"
 pandas = "^1.1.3"
@@ -42,7 +41,6 @@ httpie = "3.2.1"  # upgrade once the 3.2.2 safety issue is resolved
 httpie-jwt-auth = "^0.4.0"
 ipykernel = "^6.19.4"
 isort = "^5.6.4"
-mypy = "^0.991"
 pre-commit = "^2.14.1"
 pylint = "^2.10.2"
 pylint-absolute-imports = "^1.0.1"
@@ -56,6 +54,7 @@ safety = "^3.1.0"
 sqlalchemy-stubs = "^0.3"
 pydocstyle = "^6.3.0"
 hypothesis = "^6.82.6"
+mypy = "^1.9.0"
 
 [tool.poetry.extras]
 docs = ["sphinx-rtd-theme", "sphinxcontrib-napoleon", "myst-parser"]
diff --git a/rctab/__init__.py b/rctab/__init__.py
index 8fc4b33..d93667b 100644
--- a/rctab/__init__.py
+++ b/rctab/__init__.py
@@ -1,4 +1,5 @@
 """The RCTab FastAPI web app."""
+
 from rctab.main import app
 
 __all__ = ["app"]
diff --git a/rctab/constants.py b/rctab/constants.py
index 03f7c97..adfd325 100644
--- a/rctab/constants.py
+++ b/rctab/constants.py
@@ -1,4 +1,5 @@
 """Constants that don't change often enough to go in Settings."""
+
 from importlib import metadata
 
 ADMIN_OID = "8b8fb95c-e391-43dd-a6f9-1b03574f7c39"
diff --git a/rctab/crud/__init__.py b/rctab/crud/__init__.py
index beaa502..b0b80a8 100644
--- a/rctab/crud/__init__.py
+++ b/rctab/crud/__init__.py
@@ -1,4 +1,5 @@
 """The SQLAlchemy models, Pydantic models and database logic."""
+
 from rctab.crud import accounting_models, models, schema
 
 __all__ = [
diff --git a/rctab/crud/accounting_models.py b/rctab/crud/accounting_models.py
index f37f501..bdd2136 100644
--- a/rctab/crud/accounting_models.py
+++ b/rctab/crud/accounting_models.py
@@ -1,4 +1,5 @@
 """SQLAlchemy models for the accounting schema."""
+
 from databases import Database
 from sqlalchemy import (
     Boolean,
diff --git a/rctab/crud/auth.py b/rctab/crud/auth.py
index 0111df7..8977d12 100644
--- a/rctab/crud/auth.py
+++ b/rctab/crud/auth.py
@@ -1,4 +1,5 @@
 """User authentication with Active Directory."""
+
 from typing import Dict, Optional
 
 import fastapimsal
diff --git a/rctab/crud/models.py b/rctab/crud/models.py
index 24e2306..d37e3d2 100644
--- a/rctab/crud/models.py
+++ b/rctab/crud/models.py
@@ -1,4 +1,5 @@
 """SQLAlchemy models for the default schema."""
+
 from typing import List, Mapping, Sequence, Tuple
 
 import asyncpg
diff --git a/rctab/crud/schema.py b/rctab/crud/schema.py
index bb0daf9..16096dc 100644
--- a/rctab/crud/schema.py
+++ b/rctab/crud/schema.py
@@ -1,4 +1,5 @@
 """Pydantic models for the RCTab API."""
+
 import datetime
 from enum import Enum
 from typing import Dict, List, Optional, Tuple
diff --git a/rctab/crud/utils.py b/rctab/crud/utils.py
index e325705..f7b9aaf 100644
--- a/rctab/crud/utils.py
+++ b/rctab/crud/utils.py
@@ -1,4 +1,5 @@
 """Database utilities and helper functions."""
+
 from typing import List
 from uuid import UUID
 
diff --git a/rctab/debug.py b/rctab/debug.py
index b8a54cf..0f1a6e3 100644
--- a/rctab/debug.py
+++ b/rctab/debug.py
@@ -1,4 +1,5 @@
 """Used as an entrypoint when debugging from an IDE."""
+
 import uvicorn
 
 from rctab.main import app
diff --git a/rctab/logutils.py b/rctab/logutils.py
index 7853525..5cf0d5c 100644
--- a/rctab/logutils.py
+++ b/rctab/logutils.py
@@ -1,4 +1,5 @@
 """Utilities for logging to a central log workspace."""
+
 import logging
 from typing import Optional
 
diff --git a/rctab/main.py b/rctab/main.py
index 23cb326..5d22dea 100644
--- a/rctab/main.py
+++ b/rctab/main.py
@@ -1,4 +1,5 @@
 """The entrypoint of the FastAPI application."""
+
 import logging
 from pathlib import Path
 from typing import Any, Callable, Dict, Final
diff --git a/rctab/routers/accounting/__init__.py b/rctab/routers/accounting/__init__.py
index 318b586..8b79bd4 100644
--- a/rctab/routers/accounting/__init__.py
+++ b/rctab/routers/accounting/__init__.py
@@ -1,4 +1,5 @@
 """The accounting routes."""
+
 from rctab.routers.accounting import (
     allocations,
     approvals,
diff --git a/rctab/routers/accounting/abolishment.py b/rctab/routers/accounting/abolishment.py
index c1fe253..78f4a72 100644
--- a/rctab/routers/accounting/abolishment.py
+++ b/rctab/routers/accounting/abolishment.py
@@ -1,4 +1,5 @@
 """Mark subscriptions as "abolished" if they have been inactive for >90 days."""
+
 import logging
 from datetime import datetime, timedelta
 from typing import List, Optional
diff --git a/rctab/routers/accounting/allocations.py b/rctab/routers/accounting/allocations.py
index a0a5f3a..952f37e 100644
--- a/rctab/routers/accounting/allocations.py
+++ b/rctab/routers/accounting/allocations.py
@@ -1,4 +1,5 @@
 """Allocate some approved budget to a subscription."""
+
 from typing import Any, List
 
 from fastapi import Depends, HTTPException
diff --git a/rctab/routers/accounting/approvals.py b/rctab/routers/accounting/approvals.py
index fab001c..96971a7 100644
--- a/rctab/routers/accounting/approvals.py
+++ b/rctab/routers/accounting/approvals.py
@@ -1,4 +1,5 @@
 """Set and fetch approvals for subscriptions."""
+
 import datetime
 from datetime import timedelta
 from typing import Any, List, Optional
diff --git a/rctab/routers/accounting/cost_recovery.py b/rctab/routers/accounting/cost_recovery.py
index 38a6a0b..36c53d7 100644
--- a/rctab/routers/accounting/cost_recovery.py
+++ b/rctab/routers/accounting/cost_recovery.py
@@ -1,4 +1,5 @@
 """Charge subscriptions' spending to a cost centre."""
+
 from datetime import date, timedelta
 from typing import Any, Dict, List, Optional
 from uuid import UUID
diff --git a/rctab/routers/accounting/desired_states.py b/rctab/routers/accounting/desired_states.py
index e516b9e..59cd460 100644
--- a/rctab/routers/accounting/desired_states.py
+++ b/rctab/routers/accounting/desired_states.py
@@ -1,4 +1,5 @@
 """Calculate and disseminate the desired states of subscriptions."""
+
 import datetime
 import logging
 from typing import Dict, List, Optional
diff --git a/rctab/routers/accounting/finances.py b/rctab/routers/accounting/finances.py
index 2f76582..9885081 100644
--- a/rctab/routers/accounting/finances.py
+++ b/rctab/routers/accounting/finances.py
@@ -1,4 +1,5 @@
 """Deciding who to charge for a subscription's spending."""
+
 import calendar
 import datetime
 from typing import Any, List
diff --git a/rctab/routers/accounting/persistence.py b/rctab/routers/accounting/persistence.py
index 6f939a0..f3c0d97 100644
--- a/rctab/routers/accounting/persistence.py
+++ b/rctab/routers/accounting/persistence.py
@@ -1,4 +1,5 @@
 """Routes that determine whether a subscription is permanently on."""
+
 from typing import Any
 from uuid import UUID
 
diff --git a/rctab/routers/accounting/routes.py b/rctab/routers/accounting/routes.py
index 1ac55d6..ad03ea9 100644
--- a/rctab/routers/accounting/routes.py
+++ b/rctab/routers/accounting/routes.py
@@ -1,4 +1,5 @@
 """Miscellaneous queries for the accounting schema."""
+
 import datetime
 import uuid
 from typing import List, Optional, Union
diff --git a/rctab/routers/accounting/send_emails.py b/rctab/routers/accounting/send_emails.py
index 6c9be7b..ef63b3d 100644
--- a/rctab/routers/accounting/send_emails.py
+++ b/rctab/routers/accounting/send_emails.py
@@ -1,4 +1,5 @@
 """Tools for sending email notifications to users."""
+
 import logging
 from contextlib import AbstractAsyncContextManager
 from datetime import date, datetime, timedelta, timezone
diff --git a/rctab/routers/accounting/status.py b/rctab/routers/accounting/status.py
index 7ce17cc..4401be7 100644
--- a/rctab/routers/accounting/status.py
+++ b/rctab/routers/accounting/status.py
@@ -1,4 +1,5 @@
 """Receive data from the status function app."""
+
 from typing import Dict
 from uuid import UUID
 
diff --git a/rctab/routers/accounting/subscription.py b/rctab/routers/accounting/subscription.py
index 06ac6c7..ef97d43 100644
--- a/rctab/routers/accounting/subscription.py
+++ b/rctab/routers/accounting/subscription.py
@@ -1,4 +1,5 @@
 """Create and fetch subscriptions."""
+
 from typing import Any, List, Optional
 from uuid import UUID
 
diff --git a/rctab/routers/accounting/summary_emails.py b/rctab/routers/accounting/summary_emails.py
index 98b2e70..2df2a5f 100644
--- a/rctab/routers/accounting/summary_emails.py
+++ b/rctab/routers/accounting/summary_emails.py
@@ -1,4 +1,5 @@
 """Background tasks that run daily."""
+
 import logging
 from datetime import datetime
 from typing import List, Optional
diff --git a/rctab/routers/accounting/usage.py b/rctab/routers/accounting/usage.py
index e85a067..d5c5989 100644
--- a/rctab/routers/accounting/usage.py
+++ b/rctab/routers/accounting/usage.py
@@ -1,4 +1,5 @@
 """Set and get usage data."""
+
 import calendar
 import datetime
 import logging
diff --git a/rctab/routers/frontend.py b/rctab/routers/frontend.py
index 99321b1..7d752e7 100644
--- a/rctab/routers/frontend.py
+++ b/rctab/routers/frontend.py
@@ -1,4 +1,5 @@
 """The user-facing web pages."""
+
 import datetime
 import logging
 from pathlib import Path
diff --git a/rctab/settings.py b/rctab/settings.py
index 20a5f0c..33b5e9c 100644
--- a/rctab/settings.py
+++ b/rctab/settings.py
@@ -1,4 +1,5 @@
 """Global app configuration."""
+
 from functools import lru_cache
 from typing import Any, List, Optional
 from uuid import UUID
diff --git a/rctab/tasks.py b/rctab/tasks.py
index c2e0562..8eb4d35 100644
--- a/rctab/tasks.py
+++ b/rctab/tasks.py
@@ -8,6 +8,7 @@
 for the task to run on schedule:
 `celery -A rctab.tasks beat --loglevel=info`
 """
+
 import asyncio
 import logging
 from typing import Any, Final
diff --git a/rctab/utils.py b/rctab/utils.py
index d3c60ec..fd5e52d 100644
--- a/rctab/utils.py
+++ b/rctab/utils.py
@@ -1,4 +1,5 @@
 """Utility functions for the RCTab API."""
+
 import functools
 import logging
 from contextlib import contextmanager
diff --git a/scripts/get_dev_data.py b/scripts/get_dev_data.py
index f3f823d..7ce2669 100644
--- a/scripts/get_dev_data.py
+++ b/scripts/get_dev_data.py
@@ -1,5 +1,6 @@
 """Get data from production database and save as json files for testing
 """
+
 import argparse
 import json
 import os
diff --git a/tests/conftest.py b/tests/conftest.py
index 6ad9f17..333b015 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -113,7 +113,6 @@ def app_with_signed_billing_token(
     get_oauth_settings_override: Callable,
     get_token_verified_override: Callable,
 ) -> Tuple[FastAPI, str]:
-
     """Sign a JWT with private key and mock get_settings with public key field"""
     private_key = tmp_path / "key"
     public_key = tmp_path / "key.pub"
diff --git a/tests/test_tasks.py b/tests/test_tasks.py
index 07d80ca..f77776e 100644
--- a/tests/test_tasks.py
+++ b/tests/test_tasks.py
@@ -1,4 +1,5 @@
 """Tests for the rctab.tasks module."""
+
 import logging
 import os
 import subprocess
diff --git a/tests/utils.py b/tests/utils.py
index e5c75ab..d0e7d2e 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,4 +1,5 @@
 """Test helper classes."""
+
 from typing import Any, List