diff --git a/.github/workflows/docs_update.yml b/.github/workflows/docs_update.yml
index 29a13ba639..277014cc05 100644
--- a/.github/workflows/docs_update.yml
+++ b/.github/workflows/docs_update.yml
@@ -23,7 +23,7 @@ permissions:
 
 jobs:
   update:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     name: Update Online Documentation
 
     steps:
diff --git a/docs/doxygen/regen.sh b/docs/doxygen/regen.sh
index cc312dbfed..6adfe2e3ab 100755
--- a/docs/doxygen/regen.sh
+++ b/docs/doxygen/regen.sh
@@ -41,11 +41,9 @@ fi
 # Still allow using incompatible version if explicitly requested.
 if [[ -z $WX_SKIP_DOXYGEN_VERSION_CHECK ]]; then
     doxygen_version=`$DOXYGEN --version`
-    # Note: remove the hack for Doxygen 1.8.19 below when changing this to a
-    # later version.
-    doxygen_version_required=1.8.17
+    doxygen_version_required=1.9.1
     if [[ $doxygen_version != $doxygen_version_required ]]; then
-        echo "Doxygen version $doxygen_version is not supported."
+        echo "Doxygen version $doxygen_version is not officially supported."
         echo "Please use Doxygen $doxygen_version_required or export WX_SKIP_DOXYGEN_VERSION_CHECK."
         exit 1
     fi