diff --git a/doc/developer/conf.py b/doc/developer/conf.py
index 20265f4aadef..8f282c079092 100644
--- a/doc/developer/conf.py
+++ b/doc/developer/conf.py
@@ -395,8 +395,11 @@ def setup(app):
     # printfrr extensions
     app.add_object_type("frrfmt", "frrfmt", parse_node=parse_frrfmt)
 
-    # css overrides for HTML theme
-    app.add_stylesheet("overrides.css")
+    if "add_css_file" in dir(app):
+        app.add_css_file("overrides.css")
+    else:
+        app.add_stylesheet("overrides.css")
+
     # load Pygments lexer for FRR config syntax
     #
     # NB: in Pygments 2.2+ this can be done with `load_lexer_from_file`, but we
diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 000000000000..debc7f188909
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1 @@
+sphinx==4.0.2
diff --git a/doc/user/conf.py b/doc/user/conf.py
index e0aec404432e..6db58b07c317 100644
--- a/doc/user/conf.py
+++ b/doc/user/conf.py
@@ -386,16 +386,17 @@ def setup(app):
     # node later on
     app.add_object_type("clicmd", "clicmd", indextemplate="pair: %s; configuration command")
 
-    # css overrides for HTML theme
-    # Note sphinx version differences
-    sver = vparse(sphinx.__version__)
-
-    if sver < vparse("1.8.0"):
-        app.add_stylesheet("overrides.css")
-        app.add_javascript("overrides.js")
+    # I dont care how stupid this is
+    if "add_js_file" in dir(app):
+        app.add_js_file("overrides.js")
     else:
+        app.add_javascript("overrides.js")
+
+    if "add_css_file" in dir(app):
         app.add_css_file("overrides.css")
-        app.add_js_file("overrides.js")
+    else:
+        app.add_stylesheet("overrides.css")
+
 
     # load Pygments lexer for FRR config syntax
     #