diff --git a/hetzner.yaml b/hetzner.yaml
index e38022d..85fa2c8 100644
--- a/hetzner.yaml
+++ b/hetzner.yaml
@@ -69,6 +69,7 @@
         - name: Inform Mattermost about success
           uri:
             url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            validate_certs: no
             method: POST
             body_format: json
             body:
@@ -78,6 +79,7 @@
         - name: Inform Mattermost about error
           uri:
             url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            validate_certs: no
             method: POST
             body_format: json
             body: