diff --git a/tasks/forgejo.yaml b/tasks/forgejo.yaml
index 45cdb06..ef7c6e1 100644
--- a/tasks/forgejo.yaml
+++ b/tasks/forgejo.yaml
@@ -64,3 +64,8 @@
 
       # mailer
       FORGEJO__mailer__ENABLED: "false"
+
+      # authentication
+      FORGEJO__openid__ENABLE_OPENID_SIGNIN: "false"
+      FORGEJO__openid__ENABLE_OPENID_SIGNUP: "false"
+      FORGEJO__service__DISABLE_REGISTRATION: "true"