diff --git a/marko/ext/gfm/elements.py b/marko/ext/gfm/elements.py
index ee81cc6..f2b0886 100644
--- a/marko/ext/gfm/elements.py
+++ b/marko/ext/gfm/elements.py
@@ -35,7 +35,7 @@ class InlineHTML(inline.InlineHTML):
 class Strikethrough(inline.InlineElement):
 
     pattern = re.compile(r"~~([^~]+)~~")
-    priority = 4
+    priority = 5
     parse_children = True
 
 
diff --git a/noxfile.py b/noxfile.py
index e7f0ea1..a5047e9 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -5,7 +5,7 @@ import nox
 os.environ.update(PDM_IGNORE_SAVED_PYTHON="1")
 
 
-@nox.session(python=["3.6", "3.8", "3.9", "3.10"])
+@nox.session(python=["3.6", "3.8", "3.9", "3.10", "3.11"])
 def tests(session):
     session.run("pdm", "install", "-d", external=True)
     session.run("pytest", "tests/")