diff --git a/docs/conf.py b/docs/conf.py
index 938631f7..b0b23f42 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -69,7 +69,7 @@ def find_version(*file_paths) -> str:
 #
 # 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 = None
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
diff --git a/pyproject.toml b/pyproject.toml
index 613b91dd..320777c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,7 @@ strict = true
 # TODO: remove these strict loosenings when possible
 allow_incomplete_defs = true
 allow_untyped_defs = true
+warn_return_any = false
 
 [[tool.mypy.overrides]]
 module = "tests.*"
diff --git a/setup.cfg b/setup.cfg
index e5f01712..e6d9f3f9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -41,7 +41,7 @@ packages = find:
 
 [options.extras_require]
 docs =
-    sphinx>=4.5.0,<5.0.0
+    sphinx
     sphinx-rtd-theme
     zope.interface
 crypto =
@@ -50,7 +50,7 @@ tests =
     pytest>=6.0.0,<7.0.0
     coverage[toml]==5.0.4
 dev =
-    sphinx>=4.5.0,<5.0.0
+    sphinx
     sphinx-rtd-theme
     zope.interface
     cryptography>=3.4.0