diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a648de1..a63ca66 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -11,7 +11,7 @@ repos:
 
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.15.20
+    rev: v0.17.0
     hooks:
       - id: ruff
         name: Lint with Ruff
diff --git a/src/anarcii/input_data_processing/__init__.py b/src/anarcii/input_data_processing/__init__.py
index d793e2f..4d7ebc3 100644
--- a/src/anarcii/input_data_processing/__init__.py
+++ b/src/anarcii/input_data_processing/__init__.py
@@ -25,9 +25,9 @@
     from typing import Union
 
     Input = Union[
-        Path, str, tuple[str, str], list[Union[str, tuple[str, str]]], dict[str, str]
+        Path, str, tuple[str, str], list[str | tuple[str, str]], dict[str, str]
     ]
-    SequenceDict = dict[Union[str, tuple[int, str]], str]
+    SequenceDict = dict[str | tuple[int, str], str]
     # A TokenisedSequence is a torch.Tensor of dtype np.int32.
     TokenisedSequence = torch.Tensor