diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 09189aaf..a36b602f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ ci:
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: "v0.6.9"
+    rev: "v0.9.1"
     hooks:
       - id: ruff
         args: ["--fix", "--show-fixes"]
@@ -24,7 +24,7 @@ repos:
       - id: check-docstring-first
 
   - repo: https://github.com/executablebooks/mdformat
-    rev: 0.7.17
+    rev: 0.7.21
     hooks:
       - id: mdformat
         additional_dependencies:
@@ -32,7 +32,7 @@ repos:
           - mdformat-myst
 
   - repo: https://github.com/kynan/nbstripout
-    rev: 0.7.1
+    rev: 0.8.1
     hooks:
       - id: nbstripout
         args: [--extra-keys=metadata.kernelspec metadata.language_info.version]
@@ -45,12 +45,12 @@ repos:
           - tomli
 
   - repo: https://github.com/abravalheri/validate-pyproject
-    rev: v0.20.2
+    rev: v0.23
     hooks:
       - id: validate-pyproject
 
   - repo: https://github.com/rhysd/actionlint
-    rev: v1.7.3
+    rev: v1.7.6
     hooks:
       - id: actionlint
         files: ".github/workflows/"
diff --git a/flox/core.py b/flox/core.py
index 91903ded..81d9954c 100644
--- a/flox/core.py
+++ b/flox/core.py
@@ -2364,8 +2364,7 @@ def groupby_reduce(
 
     if engine == "flox" and _is_arg_reduction(func):
         raise NotImplementedError(
-            "argreductions not supported for engine='flox' yet."
-            "Try engine='numpy' or engine='numba' instead."
+            "argreductions not supported for engine='flox' yet. Try engine='numpy' or engine='numba' instead."
         )
 
     if engine == "numbagg" and dtype is not None:
diff --git a/tests/__init__.py b/tests/__init__.py
index deaf7c0a..84cca72e 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -66,9 +66,7 @@ def __init__(self, max_computes=0):
     def __call__(self, dsk, keys, **kwargs):
         self.total_computes += 1
         if self.total_computes > self.max_computes:
-            raise RuntimeError(
-                "Too many computes. Total: %d > max: %d." % (self.total_computes, self.max_computes)
-            )
+            raise RuntimeError(f"Too many computes. Total: {self.total_computes} > max: {self.max_computes}.")
         return dask.get(dsk, keys, **kwargs)