diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f4d008d5..f83bd5ea 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
   # Ruff version.
-  rev: v0.7.4
+  rev: v0.9.3
   hooks:
     # Run the linter.
     - id: ruff
diff --git a/janus_core/calculations/phonons.py b/janus_core/calculations/phonons.py
index af2b9ee1..7919a2bd 100644
--- a/janus_core/calculations/phonons.py
+++ b/janus_core/calculations/phonons.py
@@ -598,9 +598,9 @@ def write_bands(
             labels = paths_info["labels"]
             num_q_points = sum(len(q) for q in paths_info["paths"])
             num_labels = len(labels)
-            assert (
-                num_q_points == num_labels
-            ), "Number of labels is different to number of q-points specified"
+            assert num_q_points == num_labels, (
+                "Number of labels is different to number of q-points specified"
+            )
 
             q_points, connections = get_band_qpoints_and_path_connections(
                 band_paths=paths_info["paths"], npoints=paths_info["npoints"]
diff --git a/janus_core/helpers/mlip_calculators.py b/janus_core/helpers/mlip_calculators.py
index 25ecabe9..5706000b 100644
--- a/janus_core/helpers/mlip_calculators.py
+++ b/janus_core/helpers/mlip_calculators.py
@@ -113,8 +113,7 @@ def choose_calculator(
         # No default `model_path`
         if model_path is None:
             raise ValueError(
-                "Please specify `model_path`, as there is no "
-                f"default model for {arch}"
+                f"Please specify `model_path`, as there is no default model for {arch}"
             )
         # Default to float64 precision
         kwargs.setdefault("default_dtype", "float64")
diff --git a/janus_core/processing/observables.py b/janus_core/processing/observables.py
index 93ed5c66..cd43371f 100644
--- a/janus_core/processing/observables.py
+++ b/janus_core/processing/observables.py
@@ -124,7 +124,7 @@ def components(self, components: list[str]):
         """
         if any(components - self._allowed_components.keys()):
             raise ValueError(
-                f"'{components-self._allowed_components.keys()}'"
+                f"'{components - self._allowed_components.keys()}'"
                 f" invalid, must be '{', '.join(self._allowed_components)}'"
             )
 
diff --git a/pyproject.toml b/pyproject.toml
index 76f14b1e..783c8e10 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -91,7 +91,7 @@ docs = [
 
 pre-commit = [
     "pre-commit<4.0.0,>=3.6.0",
-    "ruff<1.0.0,>=0.7.4",
+    "ruff<1.0.0,>=0.9.3",
 ]
 
 [build-system]