diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9e9ffc0..aac4daa 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,14 +12,14 @@ repos:
       - id: validate-pyproject
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.12.11
+    rev: v0.13.3
     hooks:
       - id: ruff-check
         args: [--fix, --unsafe-fixes]
       - id: ruff-format
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.17.1
+    rev: v1.18.2
     hooks:
       - id: mypy
         files: "^src/"
diff --git a/src/useq/_grid.py b/src/useq/_grid.py
index 2ad9ebe..c86a8c8 100644
--- a/src/useq/_grid.py
+++ b/src/useq/_grid.py
@@ -636,7 +636,7 @@ def plot(
             rect = None
 
         # Get polygon bounds for plotting
-        min_x, min_y, max_x, max_y = self.poly.bounds
+        _min_x, _min_y, _max_x, _max_y = self.poly.bounds
 
         return plot_points(
             self,
diff --git a/src/useq/_plate.py b/src/useq/_plate.py
index ef99796..c378948 100644
--- a/src/useq/_plate.py
+++ b/src/useq/_plate.py
@@ -452,7 +452,7 @@ def __repr__(self) -> str:
 def _expression_repr(expr: tuple[Sequence[int], Sequence[int]]) -> _Repr:
     """Try to represent an index expression as slice objects if possible."""
     e0, e1 = expr
-    ptrn1, repeats = _find_pattern(e1)
+    ptrn1, _repeats = _find_pattern(e1)
     if ptrn1 is None:
         return _Repr(str(expr))
     ptrn0 = e0[:: len(ptrn1)]