diff --git a/sphinx_markdown_builder/__init__.py b/sphinx_markdown_builder/__init__.py
index 7fd15b8..82f2f85 100644
--- a/sphinx_markdown_builder/__init__.py
+++ b/sphinx_markdown_builder/__init__.py
@@ -3,12 +3,13 @@
 """
 
 from sphinx_markdown_builder.builder import MarkdownBuilder
+from sphinx.util.typing import ExtensionMetadata
 
 __version__ = "0.6.8"
 __docformat__ = "reStructuredText"
 
 
-def setup(app):
+def setup(app) -> ExtensionMetadata:
     app.add_builder(MarkdownBuilder)
     app.add_config_value("markdown_http_base", "", "html", str)
     app.add_config_value("markdown_uri_doc_suffix", ".md", "html", str)
@@ -17,3 +18,9 @@ def setup(app):
     app.add_config_value("markdown_anchor_signatures", False, "html", bool)
     app.add_config_value("markdown_docinfo", False, "html", bool)
     app.add_config_value("markdown_bullet", "*", "html", str)
+
+    return {
+        "version": __version__,
+        "parallel_read_safe": True,
+        "parallel_write_safe": True,
+    }