diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 96472ce..74f9e65 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,7 +33,7 @@ repos:
       - id: end-of-file-fixer
         name: end-of-file-fixer
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.3.1
+    rev: v0.3.4
     hooks:
       - id: ruff
         args:
@@ -79,7 +79,7 @@ repos:
         name: editorconfig-checker
         alias: ec
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.8.0
+    rev: v1.9.0
     hooks:
       - id: mypy
         files: ^src
@@ -88,7 +88,7 @@ repos:
           - platformdirs
           - wcmatch
   - repo: https://github.com/tcort/markdown-link-check
-    rev: v3.11.2
+    rev: v3.12.1
     hooks:
       - id: markdown-link-check
         name: markdown-link-check
diff --git a/pyproject.toml b/pyproject.toml
index 4f4097a..1466d96 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mkdocs-include-markdown-plugin"
-version = "6.0.4"
+version = "6.0.5"
 description = "Mkdocs Markdown includer plugin."
 readme = "README.md"
 license = "Apache-2.0"
diff --git a/src/mkdocs_include_markdown_plugin/event.py b/src/mkdocs_include_markdown_plugin/event.py
index 0f2cafe..9b705b3 100644
--- a/src/mkdocs_include_markdown_plugin/event.py
+++ b/src/mkdocs_include_markdown_plugin/event.py
@@ -444,8 +444,8 @@ def found_include_markdown_tag(  # noqa: PLR0912, PLR0915
             arguments_string,
         )
         if offset_match:
-            offset = offset_match[1]
-            if offset == '':
+            offset_raw_value = offset_match[1]
+            if offset_raw_value == '':
                 lineno = lineno_from_content_start(
                     markdown,
                     directive_match_start,
@@ -456,15 +456,15 @@ def found_include_markdown_tag(  # noqa: PLR0912, PLR0915
                     f' {os.path.relpath(page_src_path, docs_dir)}:{lineno}',
                 )
             try:
-                offset = int(offset)
+                offset = int(offset_raw_value)
             except ValueError:
                 lineno = lineno_from_content_start(
                     markdown,
                     directive_match_start,
                 )
                 raise PluginError(
-                    f"Invalid 'heading-offset' argument \"{offset}\" in"
-                    " 'include-markdown' directive at "
+                    f"Invalid 'heading-offset' argument \"{offset_raw_value}\""
+                    " in 'include-markdown' directive at "
                     f'{os.path.relpath(page_src_path, docs_dir)}:{lineno}',
                 ) from None
         else:
@@ -556,7 +556,7 @@ def found_include_markdown_tag(  # noqa: PLR0912, PLR0915
                     )
                 )
 
-            if offset_match:
+            if offset:
                 new_text_to_include = process.increase_headings_offset(
                     new_text_to_include,
                     offset=offset + cumulative_heading_offset,