diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 955040155..f80b1ad1a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -48,7 +48,7 @@ repos:
         - --exclude=binder/
         - --exclude=versioneer.py
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.8.0
+  rev: v0.8.1
   hooks:
     - id: ruff
       args: [--fix, --show-fixes]
diff --git a/pymc/step_methods/hmc/nuts.py b/pymc/step_methods/hmc/nuts.py
index cc29e0334..770605f4b 100644
--- a/pymc/step_methods/hmc/nuts.py
+++ b/pymc/step_methods/hmc/nuts.py
@@ -242,24 +242,24 @@ def competence(var, has_grad):
 
 class _Tree:
     __slots__ = (
-        "ndim",
-        "integrator",
-        "start",
-        "step_size",
         "Emax",
-        "start_energy",
-        "rng",
-        "left",
-        "right",
-        "proposal",
         "depth",
-        "log_size",
+        "floatX",
+        "integrator",
+        "left",
         "log_accept_sum",
+        "log_size",
+        "max_energy_change",
         "mean_tree_accept",
         "n_proposals",
+        "ndim",
         "p_sum",
-        "max_energy_change",
-        "floatX",
+        "proposal",
+        "right",
+        "rng",
+        "start",
+        "start_energy",
+        "step_size",
     )
 
     def __init__(