diff --git a/src/compwa_policy/check_dev_files/upgrade_lock.py b/src/compwa_policy/check_dev_files/upgrade_lock.py
index a717dc0b..2dde61e9 100644
--- a/src/compwa_policy/check_dev_files/upgrade_lock.py
+++ b/src/compwa_policy/check_dev_files/upgrade_lock.py
@@ -113,13 +113,14 @@ def _update_precommit_schedule(
     if ci_section is None:
         return
     key = "autoupdate_schedule"
-    if key not in ci_section:
-        return
     if get_dependabot_ecosystems() & __TRIGGER_ECOSYSTEMS:
-        del ci_section[key]
+        frequency = "quarterly"
+        if ci_section.get(key) == frequency:
+            return
+        ci_section[key] = "quarterly"
         precommit.changelog.append(
-            "Deactivated pre-commit autoupdate schedule, because it is already"
-            f" triggered by the {CONFIG_PATH.github_workflow_dir / 'lock.yml'}."
+            "Set pre-commit autoupdate schedule to quarterly (maximum), because the"
+            " schedule is now determined by Dependabot"
         )
     else:
         if frequency == "semiannually":
diff --git a/src/compwa_policy/utilities/vscode.py b/src/compwa_policy/utilities/vscode.py
index d828a819..34042cb9 100644
--- a/src/compwa_policy/utilities/vscode.py
+++ b/src/compwa_policy/utilities/vscode.py
@@ -127,7 +127,7 @@ def _determine_new_value(old: V, new: V, sort: bool = False) -> V:
     if isinstance(old, dict) and isinstance(new, dict):
         return _update_dict_recursively(old, new, sort)  # ty:ignore[invalid-return-type]
     if isinstance(old, list) and isinstance(new, list):
-        return sorted({*old, *new})  # ty:ignore[invalid-argument-type]
+        return sorted({*old, *new})  # ty:ignore[invalid-return-type]
     return new