diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 77a65c5..47771f3 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+0.5.2
+-----
+
+- Remove support for singlehtml
+  `#40 <https://github.com/jdillard/sphinx-llms-txt/pull/40>`_
+
 0.5.1
 -----
 
diff --git a/sphinx_llms_txt/__init__.py b/sphinx_llms_txt/__init__.py
index af96cf1..b96cc20 100644
--- a/sphinx_llms_txt/__init__.py
+++ b/sphinx_llms_txt/__init__.py
@@ -21,7 +21,7 @@ from .manager import LLMSFullManager
 from .processor import DocumentProcessor
 from .writer import FileWriter
 
-__version__ = "0.5.1"
+__version__ = "0.5.2"
 
 # Export classes needed by tests
 __all__ = [
@@ -129,7 +129,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     def builder_inited(app):
         """Used to limit what builders are allowed to run the extension."""
 
-        allowed_builders = ["html", "singlehtml", "dirhtml"]
+        allowed_builders = ["html", "dirhtml"]
         if hasattr(app, "builder") and app.builder.name in allowed_builders:
             # Reset manager and root paragraph for each build
             global _manager, _root_first_paragraph
diff --git a/sphinx_llms_txt/manager.py b/sphinx_llms_txt/manager.py
index 1f97da5..2215c85 100644
--- a/sphinx_llms_txt/manager.py
+++ b/sphinx_llms_txt/manager.py
@@ -197,7 +197,6 @@ class LLMSFullManager:
         possible_sources = [
             Path(outdir) / "_sources",
             Path(outdir) / "html" / "_sources",
-            Path(outdir) / "singlehtml" / "_sources",
         ]
 
         for path in possible_sources: