diff --git a/.github/workflows/qa.yml b/.github/workflows/qa.yml
index aa4343315..571ead8eb 100644
--- a/.github/workflows/qa.yml
+++ b/.github/workflows/qa.yml
@@ -16,6 +16,7 @@ jobs:
       matrix:
         toxenv:
           - checkqa
+          - mypy
           - readme
         python-version:
           - "3.x"
diff --git a/piptools/logging.py b/piptools/logging.py
index 87c552667..cc9828c24 100644
--- a/piptools/logging.py
+++ b/piptools/logging.py
@@ -12,7 +12,7 @@
 class LogContext:
     stream = sys.stderr
 
-    def __init__(self, verbosity=0, indent_width=2):
+    def __init__(self, verbosity: int = 0, indent_width: int = 2):
         self.verbosity = verbosity
         self.current_indent = 0
         self._indent_width = indent_width
diff --git a/piptools/py.typed b/piptools/py.typed
new file mode 100644
index 000000000..e69de29bb
diff --git a/piptools/scripts/compile.py b/piptools/scripts/compile.py
index f9e26ea0a..c861838bb 100755
--- a/piptools/scripts/compile.py
+++ b/piptools/scripts/compile.py
@@ -3,6 +3,7 @@
 import sys
 import tempfile
 import warnings
+from typing import Any
 
 from click import Command
 from click.utils import safecall
@@ -25,7 +26,7 @@
 DEFAULT_REQUIREMENTS_OUTPUT_FILE = "requirements.txt"
 
 
-def _get_default_option(option_name):
+def _get_default_option(option_name: str) -> Any:
     """
     Get default value of the pip's option (including option from pip.conf)
     by a given option name.
diff --git a/piptools/utils.py b/piptools/utils.py
index 1b2560b70..e6f9cef47 100644
--- a/piptools/utils.py
+++ b/piptools/utils.py
@@ -43,7 +43,7 @@ def key_from_req(req):
     return key
 
 
-def comment(text):
+def comment(text: str) -> str:
     return style(text, fg="green")
 
 
diff --git a/setup.cfg b/setup.cfg
index 710868286..5f30716e6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -69,3 +69,17 @@ pytest-parametrize-values-row-type = tuple
 
 [isort]
 profile = black
+
+[mypy]
+disallow_any_generics = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+ignore_missing_imports = true
+no_implicit_optional = true
+strict_equality = true
+warn_redundant_casts = true
+warn_return_any = true
+warn_unused_configs = true
+warn_unused_ignores = true
diff --git a/tox.ini b/tox.ini
index d3f9d736c..893d43e7c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ envlist =
     # NOTE: keep this in sync with the env list in .github/workflows/ci.yml.
     py{36,37,38,39,py,py3}-pip{20.1,20.2,20.3,previous,latest,master}-coverage
     checkqa
+    mypy
     readme
 skip_missing_interpreters = True
 
@@ -33,6 +34,11 @@ deps = pre-commit
 commands_pre =
 commands = pre-commit run --all-files --show-diff-on-failure
 
+[testenv:mypy]
+deps = mypy
+commands_pre =
+commands = mypy piptools
+
 [testenv:readme]
 deps = twine
 commands_pre =