diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d526602d..053ebce9 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 - repo: https://github.com/psf/black
-  rev: 23.3.0
+  rev: 23.9.1
   hooks:
     - id: black
       language_version: python3
@@ -19,13 +19,13 @@ repos:
   hooks:
     - id: python-no-eval  # A quick check for the eval() built-in function.
 - repo: https://github.com/PyCQA/docformatter
-  rev: v1.7.3
+  rev: v1.7.5
   hooks:
     - id: docformatter
       args: [--in-place]
       exclude: mkdocs_macros.py
 - repo: https://github.com/PyCQA/flake8
-  rev: 6.0.0
+  rev: 6.1.0
   hooks:
     - id: flake8
       # additional_dependencies: [flake8-docstrings, flake8-bugbear, flake8-spellcheck, flake8-import-order]
@@ -34,7 +34,7 @@ repos:
   hooks:
     - id: nbstripout
 -   repo: https://github.com/asottile/blacken-docs
-    rev: 1.14.0
+    rev: 1.16.0
     hooks:
     - id: blacken-docs
 - repo: https://github.com/nbQA-dev/nbQA
diff --git a/src/ruptures/utils/utils.py b/src/ruptures/utils/utils.py
index 356b736a..6db4fc7b 100644
--- a/src/ruptures/utils/utils.py
+++ b/src/ruptures/utils/utils.py
@@ -5,7 +5,7 @@
 
 
 def pairwise(iterable):
-    """s -> (s0,s1), (s1,s2), (s2, s3), ..."""
+    """S -> (s0,s1), (s1,s2), (s2, s3), ..."""
     a, b = tee(iterable)
     next(b, None)
     return zip(a, b)