diff --git a/otterdog/eclipse-langium.jsonnet b/otterdog/eclipse-langium.jsonnet
index 06f2c88..882e5af 100644
--- a/otterdog/eclipse-langium.jsonnet
+++ b/otterdog/eclipse-langium.jsonnet
@@ -14,6 +14,7 @@ orgs.newOrg('eclipse-langium') {
       allow_update_branch: false,
       delete_branch_on_merge: false,
       description: "Next-gen language engineering / DSL framework",
+      gh_pages_build_type: "workflow",
       has_discussions: true,
       has_projects: false,
       has_wiki: false,
@@ -53,6 +54,14 @@ orgs.newOrg('eclipse-langium') {
           required_approving_review_count: 1,
         },
       ],
+      environments: [
+        orgs.newEnvironment('github-pages') {
+          branch_policies+: [
+            "main"
+          ],
+          deployment_branch_policy: "selected",
+        },
+      ],
     },
     orgs.newRepo('langium-previews') {
       default_branch: "previews",