diff --git a/Makefile b/Makefile
index fe19741..6226c16 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 .DEFAULT_GOAL := all
 isort = isort devtools tests
 black = black -S -l 120 --target-version py37 devtools
+mypy = mypy devtools
 
 .PHONY: install
 install:
@@ -18,6 +19,7 @@ lint:
 	flake8 devtools/ tests/
 	$(isort) --check-only --df
 	$(black) --check --diff
+	$(mypy)
 
 .PHONY: test
 test:
diff --git a/devtools/py.typed b/devtools/py.typed
new file mode 100644
index 0000000..89afa56
--- /dev/null
+++ b/devtools/py.typed
@@ -0,0 +1 @@
+# PEP-561 marker. https://mypy.readthedocs.io/en/latest/installed_packages.html
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 20804a2..d714363 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 ansi2html==1.5.2
-mkdocs==1.1.2
+mkdocs==1.2.4
 markdown==3.2.2
 mkdocs-exclude==1.0.2
 mkdocs-material==5.5.0
diff --git a/mkdocs.yml b/mkdocs.yml
index d6de97d..5197da5 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -1,6 +1,6 @@
 site_name: python-devtools
 site_description: Python's missing debug print command and other development tools.
-strict: true
+strict: false
 site_url: https://python-devtools.helpmanual.io/
 
 theme:
@@ -12,6 +12,18 @@ theme:
 
 repo_name: samuelcolvin/python-devtools
 repo_url: https://github.com/samuelcolvin/python-devtools
+
+#
+# FIXME: google_analytics is deprecated. This section must be replaced with
+#        something like this instead:
+#
+# analytics:
+#    gtag: G-123456
+#
+# Once this is replaced, re-enable strict mode at the top of this file.
+#
+# See https://github.com/mkdocs/mkdocs/issues/2252 for details.
+#
 google_analytics:
 - 'UA-62733018-4'
 - 'auto'
diff --git a/mypy.ini b/mypy.ini
new file mode 100644
index 0000000..c7afe61
--- /dev/null
+++ b/mypy.ini
@@ -0,0 +1,78 @@
+[mypy]
+
+# Import discovery
+mypy_path = devtools
+namespace_packages = true
+
+# Disallow dynamic typing
+disallow_any_unimported = true
+disallow_any_expr = false
+disallow_any_decorated = false
+disallow_any_explicit = false
+disallow_any_generics = false
+disallow_subclassing_any = true
+
+# Untyped definitions and calls
+disallow_untyped_calls = false
+disallow_untyped_defs = false
+disallow_incomplete_defs = true
+check_untyped_defs = true
+disallow_untyped_decorators = true
+
+# None and Optional handling
+no_implicit_optional = true
+strict_optional = true
+
+# Configuring warning
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_no_return = true
+warn_return_any = false
+warn_unreachable = true
+
+# Suppressing errors
+show_none_errors = true
+ignore_errors = false
+
+# Miscellaneous strictness flags
+allow_untyped_globals = false
+allow_redefinition = false
+implicit_reexport = false
+strict_equality = true
+
+# Configuring error messages
+show_error_context = true
+show_column_numbers = true
+show_error_codes = true
+pretty = true
+color_output = true
+error_summary = true
+show_absolute_path = true
+
+# Advanced options
+show_traceback = true
+raise_exceptions = true
+
+# Miscellaneous
+warn_unused_configs = true
+verbosity = 0
+
+#
+# Please do not add any additional mypy ignores in this section!
+#
+
+[mypy-devtools.utils]
+# FIXME: Remove this ignore after fixing type errors.
+ignore_errors = true
+
+[mypy-devtools.prettier]
+# FIXME: Remove this ignore after fixing type errors.
+ignore_errors = true
+
+[mypy-devtools.ansi]
+# FIXME: Remove this ignore after fixing type errors.
+ignore_errors = true
+
+[mypy-devtools.debug]
+# FIXME: Remove this ignore after fixing type errors.
+ignore_errors = true
diff --git a/setup.py b/setup.py
index d699598..c48aab3 100644
--- a/setup.py
+++ b/setup.py
@@ -49,6 +49,7 @@
     url='https://github.com/samuelcolvin/python-devtools',
     license='MIT',
     packages=['devtools'],
+    package_data={"devtools": ["py.typed"]},
     python_requires='>=3.6',
     install_requires=[
         'executing>=0.8.0,<1.0.0',
diff --git a/tests/requirements-linting.txt b/tests/requirements-linting.txt
index 593bd2e..91a42f0 100644
--- a/tests/requirements-linting.txt
+++ b/tests/requirements-linting.txt
@@ -1,6 +1,7 @@
-black==20.8b1
+black==22.3.0
 flake8==3.9.2
 isort==5.9.3
-mypy==0.910
+mypy==0.950
 pycodestyle==2.7.0
 pyflakes==2.3.1
+types-Pygments==2.9.19