diff --git a/deepecho/models/base.py b/deepecho/models/base.py
index cfd3982..545a3e7 100644
--- a/deepecho/models/base.py
+++ b/deepecho/models/base.py
@@ -148,7 +148,7 @@ def fit(
         if segment_size is not None and not isinstance(segment_size, int):
             if sequence_index is None:
                 raise TypeError(
-                    '`segment_size` must be of type `int` if ' 'no `sequence_index` is given.'
+                    '`segment_size` must be of type `int` if no `sequence_index` is given.'
                 )
             if data[sequence_index].dtype.kind != 'M':
                 raise TypeError(
diff --git a/pyproject.toml b/pyproject.toml
index d3476dd..2152037 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -61,7 +61,7 @@ dev = [
     'watchdog>=1.0.1,<5',
 
     # style check
-    'ruff>=0.3.2,<1',
+    'ruff>=0.3.2,<0.7.2',
 
     # distribute on PyPI
     'twine>=1.10.0,<4',