diff --git a/.github/workflows/publish-javadoc.yml b/.github/workflows/publish-javadoc.yml
index 12c3fac..3c4dad1 100644
--- a/.github/workflows/publish-javadoc.yml
+++ b/.github/workflows/publish-javadoc.yml
@@ -18,7 +18,7 @@ jobs:
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           javadoc-branch: gh-pages
-          java-version: 8
+          java-version: 21
           target-folder: . # url will be https://<username>.github.io/<repo>/javadoc, This can be left as nothing to generate javadocs in the root folder.
           project: maven
-          custom-command: javadoc -private -splitindex -use -author -version -d . -sourcepath ./src **/*.java -overview "./src/Overview.html"
+          custom-command: javadoc -private -splitindex -use -author -version -d . -sourcepath ./src -overview ./src/Overview.html -subpackages .