diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 2a0a6c01a5..ac83b6178b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -29,7 +29,7 @@ repos:
     -   id: no-commit-to-branch
 
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: "v0.1.14"
+    rev: "v0.2.1"
     hooks:
     -   id: ruff
         types: [file, python]
diff --git a/lib/iris/analysis/__init__.py b/lib/iris/analysis/__init__.py
index b9bb0c13b9..773e804a14 100644
--- a/lib/iris/analysis/__init__.py
+++ b/lib/iris/analysis/__init__.py
@@ -1577,7 +1577,7 @@ def _lazy_max_run(array, axis=-1, **kwargs):
     stepped_run_lengths = da.reductions.cumreduction(
         np.maximum.accumulate,
         np.maximum,
-        np.NINF,
+        -np.inf,
         run_totals,
         axis=axis,
         dtype=cum_sum.dtype,
diff --git a/lib/iris/tests/test_cell.py b/lib/iris/tests/test_cell.py
index d5d11b8ee5..9271f47670 100644
--- a/lib/iris/tests/test_cell.py
+++ b/lib/iris/tests/test_cell.py
@@ -131,7 +131,7 @@ def test_numpy_int_equality(self):
 
     def test_numpy_float_equality(self):
         dtypes = (
-            np.float_,
+            np.float64,
             np.float16,
             np.float32,
             np.float64,
diff --git a/lib/iris/tests/unit/plot/test_contourf.py b/lib/iris/tests/unit/plot/test_contourf.py
index 64ab87f879..59fe631b67 100644
--- a/lib/iris/tests/unit/plot/test_contourf.py
+++ b/lib/iris/tests/unit/plot/test_contourf.py
@@ -93,7 +93,7 @@ def test_skip_contour(self):
     def test_apply_contour_nans(self):
         # Presence of nans should not prevent contours being added.
         cube = simple_2d()
-        cube.data = cube.data.astype(np.float_)
+        cube.data = cube.data.astype(np.float64)
         cube.data[0, 0] = np.nan
 
         levels = [2, 4, 6, 8]