diff --git a/setup.py b/setup.py
index 71fd17dc..41c75baa 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
     install_requires=[
         "Jinja2>2.0",
         "parsimonious>=0.10.0,<0.11.0",
-        "Sphinx>=4.1.0,<6.0.0",
+        "Sphinx>=4.1.0",
         "pydantic<2",
         # Pin markupsafe because of
         # https://github.com/pallets/jinja/issues/1585