diff --git a/docs/requirements.txt b/docs/requirements.txt
index 14600ff..3c54ed4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,6 @@
 alabaster<0.8
-docutils<0.15
 jinja2<2.11
-markupsafe<1.1
+markupsafe<2
 readme-renderer<23
-sphinx<2
+sphinx>=5,<6
 sphinxcontrib-websupport<1.2
diff --git a/docs/source/conf.py b/docs/source/conf.py
index d1745d7..b0e35af 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -76,7 +76,7 @@ master_doc = "index"
 #
 # 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"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.