diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 68492f03..2c12d194 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -5,7 +5,7 @@ ci:
 
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.10
+    rev: v0.15.9
     hooks:
       - id: ruff
         args: [--fix]
@@ -23,14 +23,14 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/codespell-project/codespell
-    rev: v2.4.1
+    rev: v2.4.2
     hooks:
       - id: codespell
         exclude_types: [json]
         args: [--check-filenames]
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.1
+    rev: v1.20.0
     hooks:
       - id: mypy
         exclude: (tests|examples)/
@@ -42,7 +42,7 @@ repos:
       - id: format-ipy-cells
 
   - repo: https://github.com/kynan/nbstripout
-    rev: 0.8.2
+    rev: 0.9.1
     hooks:
       - id: nbstripout
         args: [--drop-empty-cells]
diff --git a/examples/matbench_example/train_wrenformer.py b/examples/matbench_example/train_wrenformer.py
index 712e7992..74f85638 100644
--- a/examples/matbench_example/train_wrenformer.py
+++ b/examples/matbench_example/train_wrenformer.py
@@ -28,7 +28,7 @@
 epochs = 10
 folds = list(range(5))
 timestamp = f"{datetime.now():%Y-%m-%d@%H-%M-%S}"
-today = timestamp.split("@")[0]
+today = timestamp.split("@", maxsplit=1)[0]
 # job_name unlike run_name doesn't include dataset and fold since not yet known without
 # SLURM_ARRAY_TASK_ID
 job_name = f"matbench-wrenformer-robust-{epochs=}"