diff --git a/ethcore/src/client.rs b/ethcore/src/client.rs
index ba3c97422..8e49d28bf 100644
--- a/ethcore/src/client.rs
+++ b/ethcore/src/client.rs
@@ -187,7 +187,7 @@ pub struct Client {
 }
 
 const HISTORY: u64 = 1000;
-const CLIENT_DB_VER_STR: &'static str = "2.1";
+const CLIENT_DB_VER_STR: &'static str = "3";
 
 impl Client {
 	/// Create a new client with given spec and DB path.