diff --git a/src/constellation/__about__.py b/src/constellation/__about__.py
index 27da9c6..8a43ecc 100644
--- a/src/constellation/__about__.py
+++ b/src/constellation/__about__.py
@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: 2025-present Rich FitzJohn <r.fitzjohn@imperial.ac.uk>
 #
 # SPDX-License-Identifier: MIT
-__version__ = "1.4.8"
+__version__ = "1.4.9"
diff --git a/src/constellation/acme.py b/src/constellation/acme.py
index d9bdcb5..8c9544c 100644
--- a/src/constellation/acme.py
+++ b/src/constellation/acme.py
@@ -64,7 +64,7 @@ def acme_buddy_container(
         + (
             ["--dns-provider", cfg.dns_provider]
             if cfg.dns_provider is not None
-            else []
+            else ["--self-signed"]
         ),
     )
     return acme