diff --git a/kea.spec b/kea.spec
index ad32120..5ad56c3 100644
--- a/kea.spec
+++ b/kea.spec
@@ -6,7 +6,7 @@
 
 Name:           kea
 Version:        2.0.2
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        DHCPv4, DHCPv6 and DDNS server from ISC
 
 License:        MPLv2.0 and Boost
@@ -18,6 +18,10 @@ Source3:        kea-dhcp-ddns.service
 Source4:        kea-ctrl-agent.service
 
 Patch3:         kea-openssl-version.patch
+# Temporary patch from experimental development version 2.1.7
+# https://bugzilla.redhat.com/show_bug.cgi?id=2105931
+# https://github.com/isc-projects/kea/commit/d9ee88c1e61a386fa734a8224ecf77a06b1647ca
+Patch4:         spell-check-sphinx.patch
 
 # autoreconf
 BuildRequires: autoconf automake libtool
@@ -219,6 +223,9 @@ EOF
 
 
 %changelog
+* Thu Jul 21 2022 Martin Osvald <mosvald@redhat.com> - 2.0.2-4
+- kea fails to build docs with Sphinx 5+ (#2105931)
+
 * Mon Jun 13 2022 Python Maint <python-maint@redhat.com> - 2.0.2-3
 - Rebuilt for Python 3.11
 
diff --git a/spell-check-sphinx.patch b/spell-check-sphinx.patch
new file mode 100644
index 0000000..6d10aec
--- /dev/null
+++ b/spell-check-sphinx.patch
@@ -0,0 +1,13 @@
+diff --git a/doc/sphinx/conf.py b/doc/sphinx/conf.py
+index 8a6c778..6cbc638 100644
+--- a/doc/sphinx/conf.py
++++ b/doc/sphinx/conf.py
+@@ -77,7 +77,7 @@ messages_doc = 'kea-messages'
+ #
+ # 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.