diff --git a/api/cloudprotocol/certificates.go b/api/cloudprotocol/certificates.go
index 58dc257d..526d8d54 100644
--- a/api/cloudprotocol/certificates.go
+++ b/api/cloudprotocol/certificates.go
@@ -32,7 +32,7 @@ const (
 )
 
 // UnitSecretVersion specifies supported version of UnitSecret message.
-const UnitSecretVersion = 2
+const UnitSecretVersion = "2.0.0"
 
 /***********************************************************************************************************************
  * Types