diff --git a/src/currency_core/core_runtime_config.h b/src/currency_core/core_runtime_config.h
index c1ba86af..799ba0f9 100644
--- a/src/currency_core/core_runtime_config.h
+++ b/src/currency_core/core_runtime_config.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2014-2020 Zano Project
+// Copyright (c) 2014-2024 Zano Project
 // Copyright (c) 2014-2018 The Louisdor Project
 // Copyright (c) 2012-2013 The Boolberry developers
 // Distributed under the MIT/X11 software license, see the accompanying
@@ -109,10 +109,16 @@ namespace currency
     wide_difficulty_type max_pos_difficulty;
 
     hard_forks_descriptor hard_forks;
+    std::array<int, ZANO_HARDFORKS_TOTAL> min_build_numbers_for_hard_forks;
 
-    bool is_hardfork_active_for_height(size_t hardfork_id, uint64_t height) const
+    bool is_hardfork_active_for_height(size_t hardfork_id, uint64_t upcoming_block_height) const
     {
-      return hard_forks.is_hardfork_active_for_height(hardfork_id, height);
+      return hard_forks.is_hardfork_active_for_height(hardfork_id, upcoming_block_height);
+    }
+
+    int get_min_allowed_build_version_for_height(uint64_t upcoming_block_height) const
+    {
+      return min_build_numbers_for_hard_forks[hard_forks.get_the_most_recent_hardfork_id_for_height(upcoming_block_height)];
     }
 
     static uint64_t _default_core_time_function()
@@ -123,7 +129,7 @@ namespace currency
 
   inline core_runtime_config get_default_core_runtime_config()
   {
-    core_runtime_config pc = AUTO_VAL_INIT(pc);
+    core_runtime_config pc{};
     pc.min_coinstake_age = POS_MINIMUM_COINSTAKE_AGE;
     pc.pos_minimum_heigh = POS_START_HEIGHT;
     pc.tx_pool_min_fee = TX_MINIMUM_FEE;
@@ -137,7 +143,9 @@ namespace currency
     pc.hard_forks.set_hardfork_height(2, ZANO_HARDFORK_02_AFTER_HEIGHT);
     pc.hard_forks.set_hardfork_height(3, ZANO_HARDFORK_03_AFTER_HEIGHT);
     pc.hard_forks.set_hardfork_height(4, ZANO_HARDFORK_04_AFTER_HEIGHT);
-    
+    pc.hard_forks.set_hardfork_height(5, ZANO_HARDFORK_05_AFTER_HEIGHT); pc.min_build_numbers_for_hard_forks[5] = ZANO_HARDFORK_05_MIN_BUILD_VER;
+    static_assert(5 + 1 == ZANO_HARDFORKS_TOTAL);
+
     pc.get_core_time = &core_runtime_config::_default_core_time_function;
     bool r = epee::string_tools::hex_to_pod(ALIAS_SHORT_NAMES_VALIDATION_PUB_KEY, pc.alias_validation_pubkey);
     CHECK_AND_ASSERT_THROW_MES(r, "failed to parse alias_validation_pub_key");
diff --git a/src/currency_core/currency_config.h b/src/currency_core/currency_config.h
index d2bc4fa7..cb6d6c2e 100644
--- a/src/currency_core/currency_config.h
+++ b/src/currency_core/currency_config.h
@@ -258,25 +258,29 @@
 
 #define CURRENT_MEMPOOL_ARCHIVE_VER                     (CURRENCY_FORMATION_VERSION+31)
 
-//hard forks section
 #define BLOCK_MAJOR_VERSION_GENESIS                     1
 #define BLOCK_MINOR_VERSION_GENESIS                     0
 #define BLOCK_MAJOR_VERSION_INITIAL                     0
+
+/////// Hard forks setup //////////////////////////////
 #ifndef TESTNET
+// Mainnet
 #define ZANO_HARDFORK_01_AFTER_HEIGHT                   194624    // 2019-09-21 20:25:16
 #define ZANO_HARDFORK_02_AFTER_HEIGHT                   999999    // 2021-04-05 09:11:45
 #define ZANO_HARDFORK_03_AFTER_HEIGHT                   1082577   // 2021-06-01 23:28:10
 #define ZANO_HARDFORK_04_AFTER_HEIGHT                   2555000   // 2024-03-21 11:49:55
-#define ZANO_HARDFORK_05_AFTER_HEIGHT                   999999999999999999  
 #define ZANO_HARDFORK_04_TIMESTAMP_ACTUAL               1711021795ull // block 2555000, 2024-03-21 11:49:55 UTC
+#define ZANO_HARDFORK_05_AFTER_HEIGHT                   999999999999999999  
+#define ZANO_HARDFORK_05_MIN_BUILD_VER                  0
 #else
-/////// Zarcanum Testnet //////////////////////////////
+// Testnet
 #define ZANO_HARDFORK_01_AFTER_HEIGHT                   0
 #define ZANO_HARDFORK_02_AFTER_HEIGHT                   0
 #define ZANO_HARDFORK_03_AFTER_HEIGHT                   0
 #define ZANO_HARDFORK_04_AFTER_HEIGHT                   200  
-#define ZANO_HARDFORK_05_AFTER_HEIGHT                   200  
 #define ZANO_HARDFORK_04_TIMESTAMP_ACTUAL               1712785801ull // block 200, 2024-04-10 21:50:01 UTC
+#define ZANO_HARDFORK_05_AFTER_HEIGHT                   241400  
+#define ZANO_HARDFORK_05_MIN_BUILD_VER                  342
 #endif