diff --git a/lib/galaxy/util/rst_to_html.py b/lib/galaxy/util/rst_to_html.py
index 44962d656760..1141202bb585 100644
--- a/lib/galaxy/util/rst_to_html.py
+++ b/lib/galaxy/util/rst_to_html.py
@@ -25,7 +25,7 @@ def write(self, str):
             self.log_.warning(str)
 
 
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def get_publisher(error=False):
     docutils_writer = docutils.writers.html4css1.Writer()
     docutils_template_path = os.path.join(os.path.dirname(__file__), "docutils_template.txt")
@@ -57,7 +57,7 @@ def get_publisher(error=False):
     return pub
 
 
-@functools.cache
+@functools.lru_cache(maxsize=None)
 def rst_to_html(s, error=False):
     if docutils is None:
         raise Exception("Attempted to use rst_to_html but docutils unavailable.")