diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3846840f9be03733b80bca3db4eccf99646c3654..f1da5de97ec9fd60a5ca4bf292ca40e986129fd2 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,8 +12,10 @@ repos:
           - 'flake8-debugger==3.1.0'
           - 'flake8-quotes==3.3.2'
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.1.11
+    # Ruff version.
+    rev: v0.3.7
     hooks:
+      # Run the linter.
       - id: ruff
         args: [--fix]
   - repo: https://github.com/pre-commit/pre-commit-hooks
diff --git a/arkindex/documents/serializers/entities.py b/arkindex/documents/serializers/entities.py
index 6c98f9115b8d9526c951942b9a981ae779ad00c3..bc9b5a24fceca2944aaf056d0ec39d951ab48b7d 100644
--- a/arkindex/documents/serializers/entities.py
+++ b/arkindex/documents/serializers/entities.py
@@ -31,7 +31,7 @@ class EntityTypeSerializer(serializers.ModelSerializer):
         # Get an error if a request tries to change an entity type's corpus
         corpus = data.get("corpus")
         if self.instance and corpus:
-            raise ValidationError({"corpus": ["It is not possible to update an Entity Type\'s corpus."]})
+            raise ValidationError({"corpus": ["It is not possible to update an Entity Type's corpus."]})
         data = super().to_internal_value(data)
         return data