diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 289f81c7..b58ce4bf 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ repos:
     hooks:
     - id: black
 -   repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: 'v0.0.272'
+    rev: 'v0.0.277'
     hooks:
     -   id: ruff
         args: [--fix]
@@ -24,5 +24,5 @@ repos:
     hooks:
     -   id: nbqa-black
     -   id: nbqa-ruff
-        additional_dependencies: [ruff==v0.0.270]
+        additional_dependencies: [ruff==v0.0.277]
 
diff --git a/popmon/visualization/histogram_section.py b/popmon/visualization/histogram_section.py
index 87c128c7..d590a2e0 100644
--- a/popmon/visualization/histogram_section.py
+++ b/popmon/visualization/histogram_section.py
@@ -187,10 +187,7 @@ def transform(self, data_obj: dict, sections: list | None = None):
                 histogram = []
 
             # filter out potential empty heatmap plots, then prepend them to the sorted histograms
-            hplots = []
-            for h in heatmaps:
-                if isinstance(h, dict) and len(h["plot"]):
-                    hplots.append(h)
+            hplots = [h for h in heatmaps if isinstance(h, dict) and len(h["plot"])]
 
             if len(hplots) > 0:
                 plot_type_layouts["heatmap"] = hplots[0]["layout"]