diff --git a/.github/workflows/lint_code.yaml b/.github/workflows/lint_code.yaml
new file mode 100644
index 0000000..20d4f58
--- /dev/null
+++ b/.github/workflows/lint_code.yaml
@@ -0,0 +1,26 @@
+---
+name: Lint code
+
+# Run workflow on PRs and pushes to matching branches
+on:  # yamllint disable-line rule:truthy
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  lint_code:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - name: Install hatch
+        run: pip install hatch
+
+      - name: Test Python
+        run: hatch run lint:all
diff --git a/guacamole_user_sync/__init__.py b/guacamole_user_sync/__init__.py
index 1e79b4e..a124510 100644
--- a/guacamole_user_sync/__init__.py
+++ b/guacamole_user_sync/__init__.py
@@ -1,3 +1,5 @@
+"""Synchronise a Guacamole PostgreSQL database with an LDAP server."""
+
 from .__about__ import __version__ as version
 
 __all__ = ["version"]
diff --git a/guacamole_user_sync/ldap/__init__.py b/guacamole_user_sync/ldap/__init__.py
index c7a06bc..f3f37b0 100644
--- a/guacamole_user_sync/ldap/__init__.py
+++ b/guacamole_user_sync/ldap/__init__.py
@@ -1,3 +1,5 @@
+"""Interact with the LDAP server."""
+
 from .ldap_client import LDAPClient
 
 __all__ = [
diff --git a/guacamole_user_sync/models/__init__.py b/guacamole_user_sync/models/__init__.py
index dadd06b..7be1023 100644
--- a/guacamole_user_sync/models/__init__.py
+++ b/guacamole_user_sync/models/__init__.py
@@ -1,3 +1,5 @@
+"""Models used for LDAP and PostgreSQL interactions."""
+
 from .exceptions import LDAPError, PostgreSQLError
 from .guacamole import GuacamoleUserDetails
 from .ldap_objects import LDAPGroup, LDAPUser
diff --git a/guacamole_user_sync/postgresql/__init__.py b/guacamole_user_sync/postgresql/__init__.py
index c5c4081..f2ef8cf 100644
--- a/guacamole_user_sync/postgresql/__init__.py
+++ b/guacamole_user_sync/postgresql/__init__.py
@@ -1,10 +1,12 @@
+"""Interact with the PostgreSQL server."""
+
 from .postgresql_backend import PostgreSQLBackend, PostgreSQLConnectionDetails
 from .postgresql_client import PostgreSQLClient
 from .sql import SchemaVersion
 
 __all__ = [
     "PostgreSQLBackend",
-    "PostgreSQLConnectionDetails",
     "PostgreSQLClient",
+    "PostgreSQLConnectionDetails",
     "SchemaVersion",
 ]
diff --git a/pyproject.toml b/pyproject.toml
index c54995b..b693969 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,9 +22,9 @@ classifiers = [
 ]
 dependencies = [
     "ldap3==2.9.1",
-    "psycopg==3.2.1",
-    "SQLAlchemy==2.0.32",
-    "sqlparse==0.5.1",
+    "psycopg==3.2.3",
+    "SQLAlchemy==2.0.36",
+    "sqlparse==0.5.3",
 ]
 
 [project.urls]
@@ -34,13 +34,13 @@ Source = "https://github.com/alan-turing-institute/guacamole-user-sync"
 
 [project.optional-dependencies]
 lint = [
-    "black==24.8.0",
-    "mypy==1.11.2",
-    "ruff==0.6.2",
+    "black==24.10.0",
+    "mypy==1.14.1",
+    "ruff==0.9.0",
 ]
 test = [
-    "coverage[toml]==7.6.1",
-    "pytest==8.3.2",
+    "coverage[toml]==7.6.10",
+    "pytest==8.3.4",
 ]
 
 [tool.coverage.paths]
@@ -100,64 +100,13 @@ module = [
 ignore_missing_imports = true
 
 [tool.ruff.lint]
-select = [
-    "A",    # flake8-builtins
-    "ANN",  # flake8-annotations
-    "ARG",  # flake8-unused-arguments
-    "B",    # flake8-bugbear
-    "C4",   # flake8-comprehensions
-    "C90",  # McCabe complexity
-    "COM",  # flake8-commas
-    "D",    # pydocstyle
-    "DTZ",  # flake8-datetimez
-    "E",    # pycodestyle errors
-    "EM",   # flake8-errmsg
-    "F",    # pyflakes
-    "FA",   # flake8-future-annotations
-    "FBT",  # flake8-boolean-trap
-    "FLY",  # flynt
-    "FURB", # refurb
-    "G",    # flake8-logging-format
-    "I",    # isort
-    "ICN",  # flake8-import-conventions
-    "INP",  # flake8-no-pep420
-    "INT",  # flake8-gettext
-    "ISC",  # flake8-implicit-str-concat
-    "LOG",  # flake8-logging
-    "N",    # pep8-naming
-    "PERF", # perflint
-    "PGH",  # pygrep-hooks
-    "PIE",  # flake8-pie
-    "PL",   # pylint
-    "PT",   # flake8-pytest-style
-    "PTH",  # flake8-use-pathlib
-    "PYI",  # flake8-pyi
-    "Q",    # flake8-quotes
-    "RET",  # flake8-return
-    "RSE",  # flake8-rse
-    "RUF",  # Ruff-specific rules
-    "S",    # flake8-bandit
-    "SIM",  # flake8-simplify
-    "SLF",  # flake8-self
-    "T20",  # flake8-print
-    "TCH",  # flake8-type-checking
-    "TID",  # flake8-tidy-imports
-    "TRY",  # tryceratops
-    "UP",   # pyupgrade
-    "W",    # pycodestyle warnings
-    "YTT",  # flake8-2020
-]
+select = ["ALL"]
 ignore = [
-    "ANN101",   # missing-type-self [deprecated]
-    "ANN102",   # missing-type-cls [deprecated]
     "D100",     # undocumented-public-module
     "D102",     # undocumented-public-method
     "D103",     # undocumented-public-function
-    "D104",     # undocumented-public-package
-    "D105",     # undocumented-magic-method
     "D107",     # undocumented-public-init
     "D203",     # one-blank-line-before-class [conflicts with D211]
     "D213",     # multi-line-summary-second-line [conflicts with D212]
-    "D400",     # ends-in-period [conflicts with D415]
     "S101",     # assert [conflicts with pytest]
 ]
diff --git a/synchronise.py b/synchronise.py
old mode 100644
new mode 100755
diff --git a/tests/__init__.py b/tests/__init__.py
index e69de29..3b415c7 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -0,0 +1 @@
+"""Tests for the guacamole_user_sync package."""