diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 136eec3..a83373a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,11 +1,11 @@
 repos:
 - repo: https://github.com/psf/black
-  rev: 22.10.0
+  rev: 22.12.0
   hooks:
   - id: black
 
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v4.3.0
+  rev: v4.4.0
   hooks:
   - id: check-added-large-files
   - id: check-case-conflict
@@ -19,25 +19,25 @@ repos:
   - id: trailing-whitespace
 
 - repo: https://github.com/PyCQA/isort
-  rev: 5.10.1
+  rev: 5.11.4
   hooks:
   - id: isort
 
 - repo: https://github.com/asottile/pyupgrade
-  rev: v3.2.0
+  rev: v3.3.1
   hooks:
   - id: pyupgrade
     args: ["--py36-plus"]
 
 - repo: https://github.com/pycqa/flake8
-  rev: 5.0.4
+  rev: 6.0.0
   hooks:
   - id: flake8
     exclude: docs/conf.py
     additional_dependencies: [flake8-bugbear, flake8-print]
 
 - repo: https://github.com/pre-commit/mirrors-mypy
-  rev: v0.982
+  rev: v0.991
   hooks:
   - id: mypy
     files: ^(src|tests)
diff --git a/src/uhi/numpy_plottable.py b/src/uhi/numpy_plottable.py
index ea05625..19083b7 100644
--- a/src/uhi/numpy_plottable.py
+++ b/src/uhi/numpy_plottable.py
@@ -12,6 +12,7 @@
 hist.
 """
 
+import abc
 import enum
 from typing import TYPE_CHECKING, Any, Iterator, Optional, Sequence, Tuple, Union, cast
 
@@ -179,13 +180,14 @@ def _roottarray_asnumpy(
         return arr
 
 
-class ROOTAxis:
+class ROOTAxis(abc.ABC):
     def __init__(self, tAxis: Any) -> None:
         self.tAx = tAxis
 
     def __len__(self) -> int:
         return self.tAx.GetNbins()  # type: ignore[no-any-return]
 
+    @abc.abstractmethod
     def __getitem__(self, index: int) -> Any:
         pass
 
@@ -196,6 +198,7 @@ def __eq__(self, other: Any) -> bool:
             aEdges == bEdges for aEdges, bEdges in zip(self, other)
         )
 
+    @abc.abstractmethod
     def __iter__(self) -> Union[Iterator[Tuple[float, float]], Iterator[str]]:
         pass