diff --git a/docs/conf.py b/docs/conf.py
index 8dc911e4375e90dd5102381fdc7fe6d771406ce1..d91d516dbce4797bd02aef0f811930edf2b35eaa 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020 - 2021 TU Wien.
+# Copyright (C) 2020-2022 TU Wien.
 #
 # Invenio-Utilities-TUW is free software; you can redistribute it and/or
 # modify it under the terms of the MIT License; see LICENSE file for more
@@ -64,7 +64,7 @@ release = __version__
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
diff --git a/setup.cfg b/setup.cfg
index 4c48f55d417d9555b1935f0626a9bc32de3b77ba..83977face03ca4d0e5656b7996e1492b7fb7a81a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -41,7 +41,7 @@ install_requires =
 tests =
     pytest-black>=0.3.0,<0.3.10
     pytest-invenio>=1.4.0
-    Sphinx>=4.2.0
+    sphinx>=4.5
 # Kept for backwards compatibility
 docs =