diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 13e2c37..295df0a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@
 
 repos:
 -   repo: https://github.com/python/black
-    rev: 22.1.0
+    rev: 22.3.0
     hooks:
     - id: black
 -   repo: https://github.com/fsfe/reuse-tool
@@ -30,3 +30,17 @@ repos:
         name: lint (code)
         types: [python]
         exclude: "^(docs/|examples/|setup.py$)"
+- repo: local
+  hooks:
+    - id: mypy
+      name: mypy
+      entry: "mypy --no-warn-unused-ignores jepler_udecimal"
+      language: python
+      additional_dependencies: ["mypy==0.910"]
+      types: [python]
+      # use require_serial so that script
+      # is only called once per commit
+      require_serial: true
+      # Print the number of files as a sanity-check
+      verbose: true
+      pass_filenames: false
diff --git a/jepler_udecimal/__init__.py b/jepler_udecimal/__init__.py
index 4ed7c23..56598ab 100644
--- a/jepler_udecimal/__init__.py
+++ b/jepler_udecimal/__init__.py
@@ -141,7 +141,7 @@
 
     DecimalTuple = _namedtuple("DecimalTuple", "sign digits exponent")
 except ImportError:
-    DecimalTuple = lambda *args: args
+    DecimalTuple = lambda *args: args  # type: ignore
 
 # Rounding
 ROUND_DOWN = "ROUND_DOWN"
@@ -3574,7 +3574,7 @@ def _regard_flags(self, *flags):
             self._ignored_flags.remove(flag)
 
     # We inherit object.__hash__, so we must deny this explicitly
-    __hash__ = None
+    __hash__ = None  # type: ignore
 
     def Etiny(self):
         """Returns Etiny (= Emin - prec + 1)"""
@@ -5372,7 +5372,7 @@ def _convert_for_comparison(self, other, equality_op=False):
 try:
     import re
 except:
-    import ure as re
+    import ure as re  # type: ignore
 
 _parser = re.compile(  # A numeric string consists of:
     r"([-+])?"  # an optional sign, followed by either...    # 1