diff --git a/_unittests/ut_sphinxext/test_latex_builder.py b/_unittests/ut_sphinxext/test_latex_builder.py
index f71de23f7..4150c049e 100644
--- a/_unittests/ut_sphinxext/test_latex_builder.py
+++ b/_unittests/ut_sphinxext/test_latex_builder.py
@@ -171,7 +171,8 @@ def test_latex_builder_sphinx_table(self):
             raise Exception(html)
 
         t1 = "a&b1"
-        if t1 not in html.replace("\n", ""):
+        t1b = "a&\\sphinxAtStartParb1"  # sphinx 3.5
+        if t1 not in html.replace("\n", "") and t1b not in html.replace("\n", ""):
             raise Exception(html)
 
         t1 = "\\begin{tabulary}{\\linewidth}[t]{|T|T|}"
diff --git a/src/pyquickhelper/helpgen/sphinxm_convert_doc_sphinx_helper.py b/src/pyquickhelper/helpgen/sphinxm_convert_doc_sphinx_helper.py
index 07e88e5f8..ce02117e3 100644
--- a/src/pyquickhelper/helpgen/sphinxm_convert_doc_sphinx_helper.py
+++ b/src/pyquickhelper/helpgen/sphinxm_convert_doc_sphinx_helper.py
@@ -158,9 +158,18 @@ def depart_only(self, node):
             # The program should not necessarily be here.
             pass
 
+    def visit_viewcode_anchor(self, node):
+        # Removed in sphinx 3.5
+        pass
+
+    def depart_viewcode_anchor(self, node):
+        # Removed in sphinx 3.5
+        pass
+
     def unknown_visit(self, node):  # pragma: no cover
-        raise NotImplementedError("[_AdditionalVisitDepart] Unknown node: '{0}' in '{1}'".format(
-            node.__class__.__name__, self.__class__.__name__))
+        raise NotImplementedError(
+            "[_AdditionalVisitDepart] Unknown node: '{0}' in '{1}'".format(
+                node.__class__.__name__, self.__class__.__name__))
 
 
 class HTMLTranslatorWithCustomDirectives(_AdditionalVisitDepart, HTMLTranslator):