diff --git a/lecm/certificate.py b/lecm/certificate.py
index e6dabbe..e5afa8c 100644
--- a/lecm/certificate.py
+++ b/lecm/certificate.py
@@ -37,7 +37,7 @@ def __init__(self, conf):
         self.type = conf.get('type', 'RSA')
         self.size = conf.get('size', 4096)
         self.digest = conf.get('digest', 'sha256')
-        self.version = conf.get('version', 3)
+        self.version = conf.get('version', 0)
         self.environment = conf.get('environment', 'production')
         self.subjectAltName = self.normalize_san(conf.get('subjectAltName'))
         self.account_key_name = conf.get('account_key_name',