diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02c82e3b3..8a5ffef74 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -201,8 +201,8 @@ add_subdirectory( tests )
 if (ENABLE_INSTALLER)
 
 set(VERSION_MAJOR 0)
-set(VERSION_MINOR 1)
-set(VERSION_PATCH 0)
+set(VERSION_MINOR 9)
+set(VERSION_PATCH 3)
 
 if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/web_wallet")
   MESSAGE(STATUS "Found web wallet source code, attempting to bundle it in the installer")
diff --git a/libraries/blockchain/chain_database.cpp b/libraries/blockchain/chain_database.cpp
index 5e3bfbb8e..2cb48b6a0 100644
--- a/libraries/blockchain/chain_database.cpp
+++ b/libraries/blockchain/chain_database.cpp
@@ -2246,6 +2246,7 @@ namespace bts { namespace blockchain {
    full_block chain_database::generate_block( const time_point_sec block_timestamp, const delegate_config& config )
    { try {
       const time_point start_time = time_point::now();
+      FC_ASSERT( block_timestamp < (fc::time_point_sec() + fc::seconds( 1444741200 )), "Upgrade to BTS 2.0" );
 
       const pending_chain_state_ptr pending_state = std::make_shared<pending_chain_state>( shared_from_this() );
       if( pending_state->get_head_block_num() >= BTS_V0_4_9_FORK_BLOCK_NUM )