diff --git a/configure.ac b/configure.ac
index 7ab28b6..61f75c7 100755
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 AC_PREREQ([2.69])
 define(_CLIENT_VERSION_MAJOR, 0)
 define(_CLIENT_VERSION_MINOR, 21)
-define(_CLIENT_VERSION_REVISION, 2)
+define(_CLIENT_VERSION_REVISION, 3)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_RC, 0)
 define(_CLIENT_VERSION_IS_RELEASE, true)
diff --git a/contrib/gitian-build.py b/contrib/gitian-build.py
index ad492af..eb75490 100755
--- a/contrib/gitian-build.py
+++ b/contrib/gitian-build.py
@@ -247,10 +247,6 @@ def main():
     subprocess.check_call(['git', 'checkout', args.commit])
     os.chdir(workdir)
 
-    os.chdir('gitian-builder')
-    subprocess.check_call(['git', 'pull'])
-    os.chdir(workdir)
-
     if args.build:
         build()
 
diff --git a/src/amount.h b/src/amount.h
index e079355..adc88b0 100755
--- a/src/amount.h
+++ b/src/amount.h
@@ -22,7 +22,7 @@ static const CAmount COIN = 100000000;
  * critical; in unusual circumstances like a(nother) overflow bug that allowed
  * for the creation of coins out of thin air modification could lead to a fork.
  * */
-static const CAmount MAX_MONEY = 86579950 * COIN;
+static const CAmount MAX_MONEY = 96000000 * COIN;
 inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
 
 #endif //  BITCOIN_AMOUNT_H
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 9b07427..4a97260 100755
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -59,11 +59,11 @@ class CMainParams : public CChainParams {
         consensus.BIP16Exception = uint256S("0x00043e9c6bc54d9bd266c3767a83a7b9da435dd7f84e485a2bf2a869be62f1f3");
         consensus.BIP34Height = 17;
         consensus.BIP34Hash = uint256S("0x001ea0da3586f06aa32de50b9764eec2eaba2274191771ad536092d4f9f90fa9");
-        consensus.BIP65Height = 0; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
-        consensus.BIP66Height = 0; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
-        consensus.CSVHeight = 0; // 000000000000000004a1b34462cb8aeebd5799177f7a29cf28f2d1961716b5b5
-        consensus.SegwitHeight = 0; // 0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893
-        consensus.MinBIP9WarningHeight = 0; // segwit activation height + miner confirmation window
+        consensus.BIP65Height = 1; // 001d498cbcd92d9b36fee933caf1551dd457bf710ec988e033faca697aff6a90
+        consensus.BIP66Height = 1; // 001d498cbcd92d9b36fee933caf1551dd457bf710ec988e033faca697aff6a90
+        consensus.CSVHeight = 1; // 001d498cbcd92d9b36fee933caf1551dd457bf710ec988e033faca697aff6a90
+        consensus.SegwitHeight = 1; // 001d498cbcd92d9b36fee933caf1551dd457bf710ec988e033faca697aff6a90
+        consensus.MinBIP9WarningHeight = 2017; // segwit activation height + miner confirmation window
         consensus.powLimit = uint256S("001fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 60;
@@ -83,8 +83,8 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = 1622356007; // Sunday, 30 May 2021
         consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay
 
-        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000000000015e19c1ad1");
-        consensus.defaultAssumeValid = uint256S("0x0000000d7c7c25d0e2a8a8ff4013ae7154ba2d0c0217dc71b942f41af7be990a"); // 606942
+        consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000000468939a4a704");
+        consensus.defaultAssumeValid = uint256S("0x0000040a3e7b559aea417d3f886c0e8fe69f1f0530800424b9ea739b1f2c8498"); // 939796
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -133,14 +133,15 @@ class CMainParams : public CChainParams {
                 {9074, uint256S("0x0000007e1d70d529752b87fe47f979ae5f8f27bbc987dd0c8b21c9c5a6f3099b")},
                 {12167, uint256S("0x0000006fa4023de2a1d4bd712e7d7aafa15a273f6c78b32bd87185846e0cc903")},
                 {606942, uint256S("0x0000000d7c7c25d0e2a8a8ff4013ae7154ba2d0c0217dc71b942f41af7be990a")},
+                {939796, uint256S("0x0000040a3e7b559aea417d3f886c0e8fe69f1f0530800424b9ea739b1f2c8498")},
             }
         };
 
         chainTxData = ChainTxData{
-            // Data from RPC: getchaintxstats 4096 0000000d7c7c25d0e2a8a8ff4013ae7154ba2d0c0217dc71b942f41af7be990a
-            /* nTime    */ 1656653649,
-            /* nTxCount */ 655420,
-            /* dTxRate  */ 0.01807233830764586,
+            // Data from RPC: getchaintxstats 4096 0000040a3e7b559aea417d3f886c0e8fe69f1f0530800424b9ea739b1f2c8498
+            /* nTime    */ 1676764796,
+            /* nTxCount */ 1026099,
+            /* dTxRate  */ 0.01743655840760691,
         };
     }
 };
diff --git a/src/consensus/consensus.h b/src/consensus/consensus.h
index 6e80a59..788fa4e 100755
--- a/src/consensus/consensus.h
+++ b/src/consensus/consensus.h
@@ -10,15 +10,15 @@
 #include <stdint.h>
 
 /** The maximum allowed size for a serialized block, in bytes (only for buffer size limits) */
-static const unsigned int MAX_BLOCK_SERIALIZED_SIZE = 100000000;
+static const unsigned int MAX_BLOCK_SERIALIZED_SIZE = 4000000;
 /** The maximum allowed weight for a block, see BIP 141 (network rule) */
-static const unsigned int MAX_BLOCK_WEIGHT = 100000000;
+static const unsigned int MAX_BLOCK_WEIGHT = 4000000;
 /** The maximum allowed number of signature check operations in a block (network rule) */
-static const int64_t MAX_BLOCK_SIGOPS_COST = 2000000;
+static const int64_t MAX_BLOCK_SIGOPS_COST = 80000;
 /** Coinbase transaction outputs can only be spent after this number of new blocks (network rule) */
 static const int COINBASE_MATURITY = 100;
 
-static const int WITNESS_SCALE_FACTOR = 100;
+static const int WITNESS_SCALE_FACTOR = 4;
 
 static const size_t MIN_TRANSACTION_WEIGHT = WITNESS_SCALE_FACTOR * 60; // 60 is the lower bound for the size of a valid serialized CTransaction
 static const size_t MIN_SERIALIZABLE_TRANSACTION_WEIGHT = WITNESS_SCALE_FACTOR * 10; // 10 is the lower bound for the size of a serialized CTransaction
diff --git a/src/crypto/yespower/yespower.c b/src/crypto/yespower/yespower.c
index 27c8e8d..08e34ef 100755
--- a/src/crypto/yespower/yespower.c
+++ b/src/crypto/yespower/yespower.c
@@ -1,7 +1,16 @@
 #include "yespower.h"
+#include "sysendian.h"
+
+static const yespower_params_t v1 = {YESPOWER_0_5, 4096, 16, "Client Key", 10};
+
+static const yespower_params_t v2 = {YESPOWER_1_0, 2048, 32, NULL, 0};
 
 int yespower_hash(const char *input, char *output)
 {
-	yespower_params_t params = {YESPOWER_1_0, 2048, 32, NULL, 0};
-	return yespower_tls(input, 80, &params, (yespower_binary_t *) output);
+    uint32_t time = le32dec(&input[68]);
+    if (time > 1676761800) {
+        return yespower_tls(input, 80, &v1, (yespower_binary_t *) output);
+    } else {
+        return yespower_tls(input, 80, &v2, (yespower_binary_t *) output);
+    }
 }
diff --git a/src/policy/policy.h b/src/policy/policy.h
index ccccda3..8090dff 100755
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -27,7 +27,7 @@ static const unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE = 82;
 /** Maximum number of signature check operations in an IsStandard() P2SH script */
 static const unsigned int MAX_P2SH_SIGOPS = 15;
 /** The maximum number of sigops we're willing to relay/mine in a single tx */
-static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/125;
+static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
 /** Default for -maxmempool, maximum megabytes of mempool memory usage */
 static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
 /** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/
diff --git a/src/validation.cpp b/src/validation.cpp
index c539202..588bd80 100755
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1246,6 +1246,10 @@ CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams)
               {
               nSubsidy = 2580000 * COIN;
               }
+              else if (nHeight == 939796)
+              {
+              nSubsidy = 18840100 * COIN; // Halving by 2
+              }
     // Subsidy is cut in half every 210,000 blocks which will occur approximately every 4 years.
     nSubsidy >>= halvings;
     return nSubsidy;
diff --git a/src/version.h b/src/version.h
index 900b9ef..08ef702 100755
--- a/src/version.h
+++ b/src/version.h
@@ -9,13 +9,13 @@
  * network protocol versioning
  */
 
-static const int PROTOCOL_VERSION = 70018;
+static const int PROTOCOL_VERSION = 70019;
 
 //! initial proto version, to be increased after version/verack negotiation
 static const int INIT_PROTO_VERSION = 209;
 
 //! disconnect from peers older than this proto version
-static const int MIN_PEER_PROTO_VERSION = 31800;
+static const int MIN_PEER_PROTO_VERSION = 70018;
 
 //! BIP 0031, pong message, is enabled for all versions AFTER this one
 static const int BIP0031_VERSION = 60000;