diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index cfc7ee0..86dd094 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,10 +1,10 @@
 repos:
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.15.5
+  rev: v0.17.2
   hooks:
     - id: ruff
     - id: ruff-format
 - repo: https://github.com/python-jsonschema/check-jsonschema
-  rev: 0.37.0
+  rev: 0.39.0
   hooks:
     - id: check-github-workflows
diff --git a/modelitool/combitabconvert.py b/modelitool/combitabconvert.py
index b2feb3c..3113257 100644
--- a/modelitool/combitabconvert.py
+++ b/modelitool/combitabconvert.py
@@ -5,13 +5,13 @@
 
 
 def seconds_to_datetime(index_second, ref_year):
-    since = dt.datetime(ref_year, 1, 1, tzinfo=dt.timezone.utc)
+    since = dt.datetime(ref_year, 1, 1, tzinfo=dt.UTC)
     diff_seconds = index_second + since.timestamp()
     return pd.DatetimeIndex(pd.to_datetime(diff_seconds, unit="s"))
 
 
 def datetime_to_seconds(index_datetime):
-    time_start = dt.datetime(index_datetime[0].year, 1, 1, tzinfo=dt.timezone.utc)
+    time_start = dt.datetime(index_datetime[0].year, 1, 1, tzinfo=dt.UTC)
     new_index = index_datetime.to_frame().diff().squeeze()
     new_index.iloc[0] = dt.timedelta(
         seconds=index_datetime[0].timestamp() - time_start.timestamp()
@@ -25,7 +25,7 @@ def get_dymo_time_index(df):
     Return a list containing seconds since the beginning of the Year
     Only use UTC datetime index
     """
-    time_start = dt.datetime(df.index[0].year, 1, 1, tzinfo=dt.timezone.utc)
+    time_start = dt.datetime(df.index[0].year, 1, 1, tzinfo=dt.UTC)
     new_index = df.index.to_frame().diff().squeeze()
     new_index.iloc[0] = dt.timedelta(
         seconds=df.index[0].timestamp() - time_start.timestamp()