diff --git a/build_msvc/palladium_config.h b/build_msvc/palladium_config.h
index 7d64e6c..bd18ca8 100644
--- a/build_msvc/palladium_config.h
+++ b/build_msvc/palladium_config.h
@@ -18,10 +18,10 @@
 #define CLIENT_VERSION_MAJOR 1
 
 /* Minor version */
-#define CLIENT_VERSION_MINOR 4
+#define CLIENT_VERSION_MINOR 5
 
 /* Build revision */
-#define CLIENT_VERSION_REVISION 3
+#define CLIENT_VERSION_REVISION 0
 
 /* Copyright holder(s) before %s replacement */
 #define COPYRIGHT_HOLDERS "The %s developers"
diff --git a/configure.ac b/configure.ac
index 16a7d8b..b5d07ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 AC_PREREQ([2.69])
 define(_CLIENT_VERSION_MAJOR, 1)
-define(_CLIENT_VERSION_MINOR, 4)
-define(_CLIENT_VERSION_REVISION, 3)
+define(_CLIENT_VERSION_MINOR, 5)
+define(_CLIENT_VERSION_REVISION, 0)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_RC, 0)
 define(_CLIENT_VERSION_IS_RELEASE, true)
diff --git a/doc/man/palladium-cli.1 b/doc/man/palladium-cli.1
index 28b1515..f71f8aa 100644
--- a/doc/man/palladium-cli.1
+++ b/doc/man/palladium-cli.1
@@ -1,7 +1,7 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
-.TH PALLADIUM-CLI "1" "April 2024" "palladium-cli v1.4.3" "User Commands"
+.TH PALLADIUM-CLI "1" "April 2024" "palladium-cli v1.5.0" "User Commands"
 .SH NAME
-palladium-cli \\- manual page for palladium-cli v1.4.3
+palladium-cli \\- manual page for palladium-cli v1.5.0
 .SH SYNOPSIS
 .B palladium-cli
 [\fI\,options\/\fR] \fI\,<command> \/\fR[\fI\,params\/\fR]  \fI\,Send command to Palladium Core\/\fR
@@ -15,7 +15,7 @@ palladium-cli \\- manual page for palladium-cli v1.4.3
 .B palladium-cli
 [\fI\,options\/\fR] \fI\,help <command>      Get help for a command\/\fR
 .SH DESCRIPTION
-Palladium Core RPC client version v1.4.3
+Palladium Core RPC client version v1.5.0
 .SH OPTIONS
 .HP
 \-?
diff --git a/doc/man/palladium-qt.1 b/doc/man/palladium-qt.1
index fb40a35..9406714 100644
--- a/doc/man/palladium-qt.1
+++ b/doc/man/palladium-qt.1
@@ -1,12 +1,12 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
-.TH PALLADIUM-QT "1" "April 2024" "palladium-qt v1.4.3" "User Commands"
+.TH PALLADIUM-QT "1" "April 2024" "palladium-qt v1.5.0" "User Commands"
 .SH NAME
-palladium-qt \\- manual page for palladium-qt v1.4.3
+palladium-qt \\- manual page for palladium-qt v1.5.0
 .SH SYNOPSIS
 .B palladium-qt
 [\fI\,command-line options\/\fR]
 .SH DESCRIPTION
-Palladium Core version v1.4.3
+Palladium Core version v1.5.0
 .SH OPTIONS
 .HP
 \-?
diff --git a/doc/man/palladium-tx.1 b/doc/man/palladium-tx.1
index a426277..4b3988f 100644
--- a/doc/man/palladium-tx.1
+++ b/doc/man/palladium-tx.1
@@ -1,7 +1,7 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
-.TH PALLADIUM-TX "1" "April 2024" "palladium-tx v1.4.3" "User Commands"
+.TH PALLADIUM-TX "1" "April 2024" "palladium-tx v1.5.0" "User Commands"
 .SH NAME
-palladium-tx \\- manual page for palladium-tx v1.4.3
+palladium-tx \\- manual page for palladium-tx v1.5.0
 .SH SYNOPSIS
 .B palladium-tx
 [\fI\,options\/\fR] \fI\,<hex-tx> \/\fR[\fI\,commands\/\fR]  \fI\,Update hex-encoded palladium transaction\/\fR
@@ -9,7 +9,7 @@ palladium-tx \\- manual page for palladium-tx v1.4.3
 .B palladium-tx
 [\fI\,options\/\fR] \fI\,-create \/\fR[\fI\,commands\/\fR]   \fI\,Create hex-encoded palladium transaction\/\fR
 .SH DESCRIPTION
-Palladium Core palladium\-tx utility version v1.4.3
+Palladium Core palladium\-tx utility version v1.5.0
 .SH OPTIONS
 .HP
 \-?
diff --git a/doc/man/palladium-wallet.1 b/doc/man/palladium-wallet.1
index 76a508b..b05b860 100644
--- a/doc/man/palladium-wallet.1
+++ b/doc/man/palladium-wallet.1
@@ -1,9 +1,9 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
-.TH PALLADIUM-WALLET "1" "April 2024" "palladium-wallet v1.4.3" "User Commands"
+.TH PALLADIUM-WALLET "1" "April 2024" "palladium-wallet v1.5.0" "User Commands"
 .SH NAME
-palladium-wallet \\- manual page for palladium-wallet v1.4.3
+palladium-wallet \\- manual page for palladium-wallet v1.5.0
 .SH DESCRIPTION
-Palladium Core palladium\-wallet version v1.4.3
+Palladium Core palladium\-wallet version v1.5.0
 .PP
 palladium\-wallet is an offline tool for creating and interacting with Palladium Core wallet files.
 By default palladium\-wallet will act on wallets in the default mainnet wallet directory in the datadir.
diff --git a/doc/man/palladiumd.1 b/doc/man/palladiumd.1
index f61b46a..8003cbc 100644
--- a/doc/man/palladiumd.1
+++ b/doc/man/palladiumd.1
@@ -1,12 +1,12 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
-.TH PALLADIUMD "1" "April 2024" "palladiumd v1.4.3" "User Commands"
+.TH PALLADIUMD "1" "April 2024" "palladiumd v1.5.0" "User Commands"
 .SH NAME
-palladiumd \\- manual page for palladiumd v1.4.3
+palladiumd \\- manual page for palladiumd v1.5.0
 .SH SYNOPSIS
 .B palladiumd
 [\fI\,options\/\fR]                     \fI\,Start Palladium Core\/\fR
 .SH DESCRIPTION
-Palladium Core version v1.4.3
+Palladium Core version v1.5.0
 .SH OPTIONS
 .HP
 \-?
diff --git a/src/clientversion.cpp b/src/clientversion.cpp
index 6b94d48..6034a85 100644
--- a/src/clientversion.cpp
+++ b/src/clientversion.cpp
@@ -81,8 +81,8 @@ std::string FormatFullVersion()
 {
     // Display a simplified semantic version: omit trailing ".0" and git suffix
     // by reusing FormatVersion on the aggregated CLIENT_VERSION.
-    // This yields e.g. "v1.4.3" when CLIENT_VERSION_BUILD == 0,
-    // or "v1.4.3.1" if a non-zero build number is used.
+    // This yields e.g. "v1.5.0" when CLIENT_VERSION_BUILD == 0,
+    // or "v1.5.0.1" if a non-zero build number is used.
     return std::string("v") + FormatVersion(CLIENT_VERSION);
 }
 
diff --git a/src/pow.cpp b/src/pow.cpp
index cd01e1e..6a4e2a0 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -28,6 +28,20 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
     if (params.fPowAllowMinDifficultyBlocks && pindexLast->nHeight >= 0)
         return LwmaCalculateNextWorkRequired(pindexLast, params);
 
+    // Palladium: Hard Fork at 350,000 for fast difficulty adjustment
+    if (pindexLast->nHeight + 1 >= 340000) {
+        int64_t nIntervalNew = 60;
+        if ((pindexLast->nHeight + 1) % nIntervalNew != 0)
+            return pindexLast->nBits;
+
+        int nHeightFirst = pindexLast->nHeight - (nIntervalNew - 1);
+        assert(nHeightFirst >= 0);
+        const CBlockIndex* pindexFirst = pindexLast->GetAncestor(nHeightFirst);
+        assert(pindexFirst);
+
+        return CalculateNextWorkRequired(pindexLast, pindexFirst->GetBlockTime(), params);
+    }
+
     if (pindexLast->nHeight >= 29000)
         return LwmaCalculateNextWorkRequired(pindexLast, params);
 
@@ -110,19 +124,25 @@ unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nF
     if (params.fPowNoRetargeting)
         return pindexLast->nBits;
 
+    // Palladium: Hard Fork at 350,000 for fast difficulty adjustment
+    int64_t nTargetTimespan = params.nPowTargetTimespan;
+    if (pindexLast->nHeight + 1 >= 340000) {
+        nTargetTimespan = 7200; // 60 blocks * 120 seconds
+    }
+
     // Limit adjustment step
     int64_t nActualTimespan = pindexLast->GetBlockTime() - nFirstBlockTime;
-    if (nActualTimespan < params.nPowTargetTimespan/4)
-        nActualTimespan = params.nPowTargetTimespan/4;
-    if (nActualTimespan > params.nPowTargetTimespan*4)
-        nActualTimespan = params.nPowTargetTimespan*4;
+    if (nActualTimespan < nTargetTimespan/4)
+        nActualTimespan = nTargetTimespan/4;
+    if (nActualTimespan > nTargetTimespan*4)
+        nActualTimespan = nTargetTimespan*4;
 
     // Retarget
     const arith_uint256 bnPowLimit = UintToArith256(params.powLimit);
     arith_uint256 bnNew;
     bnNew.SetCompact(pindexLast->nBits);
     bnNew *= nActualTimespan;
-    bnNew /= params.nPowTargetTimespan;
+    bnNew /= nTargetTimespan;
 
     if (bnNew > bnPowLimit)
         bnNew = bnPowLimit;
diff --git a/src/script/standard.h b/src/script/standard.h
index a710990..2d4b61f 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -30,7 +30,7 @@ public:
  * Default setting for nMaxDatacarrierBytes. 80 bytes of data, +1 for OP_RETURN,
  * +2 for the pushdata opcodes.
  */
-static const unsigned int MAX_OP_RETURN_RELAY = 83;
+static const unsigned int MAX_OP_RETURN_RELAY = 520;
 
 /**
  * A data carrying output is an unspendable output containing data. The script
diff --git a/src/validation.cpp b/src/validation.cpp
index 879ffe0..8ef53d4 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -563,6 +563,15 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
     if (fRequireStandard && !IsStandardTx(tx, reason))
         return state.Invalid(TxValidationResult::TX_NOT_STANDARD, reason);
 
+    // Check OP_RETURN size based on activation height
+    if (ChainActive().Height() < 340000) {
+        for (const CTxOut& txout : tx.vout) {
+            if (txout.scriptPubKey.IsUnspendable() && txout.scriptPubKey.size() > 83) {
+                return state.Invalid(TxValidationResult::TX_NOT_STANDARD, "bad-txns-oversize-opreturn-prefork");
+            }
+        }
+    }
+
     // Do not work on transactions that are too small.
     // A transaction with 1 segwit input and 1 P2WPHK output has non-witness size of 82 bytes.
     // Transactions smaller than this are not relayed to mitigate CVE-2017-12842 by not relaying
diff --git a/update_version.sh b/update_version.sh
new file mode 100755
index 0000000..22faf6d
--- /dev/null
+++ b/update_version.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+set -e
+
+echo "========================================================"
+echo "   Palladium Core - Master Version Updater"
+echo "========================================================"
+
+# 1. Get Inputs
+read -p "Enter CURRENT version string (e.g. 1.4.3): " OLD_VERSION
+read -p "Enter NEW version string (e.g. 1.5.0): " NEW_VERSION
+
+if [ -z "$OLD_VERSION" ] || [ -z "$NEW_VERSION" ]; then
+    echo "Error: Version strings cannot be empty."
+    exit 1
+fi
+
+# Parse the NEW version into parts (Major.Minor.Revision)
+IFS='.' read -r -a V_PARTS <<< "$NEW_VERSION"
+MAJOR="${V_PARTS[0]}"
+MINOR="${V_PARTS[1]}"
+REV="${V_PARTS[2]}"
+
+# Default to 0 if revision is missing (e.g. 1.5 becomes 1.5.0)
+if [ -z "$REV" ]; then REV="0"; fi
+
+echo "--------------------------------------------------------"
+echo "Targeting: $MAJOR.$MINOR.$REV"
+echo "--------------------------------------------------------"
+
+# 2. Global Text Replacement (Docs, Manpages, Comments)
+echo "[1/3] Performing global search & replace ($OLD_VERSION -> $NEW_VERSION)..."
+# We exclude .git directory and binaries to avoid corruption
+grep -rIl "$OLD_VERSION" . | grep -v "^./.git" | grep -v "update_version.sh" | while read -r file ; do
+    sed -i "s/$OLD_VERSION/$NEW_VERSION/g" "$file"
+done
+echo "Global text replacement done."
+
+# 3. Update configure.ac (The Linux/Unix Build System)
+echo "[2/3] Updating configure.ac..."
+if [ -f "configure.ac" ]; then
+    sed -i "s/define(_CLIENT_VERSION_MAJOR, [0-9]*)/define(_CLIENT_VERSION_MAJOR, $MAJOR)/g" configure.ac
+    sed -i "s/define(_CLIENT_VERSION_MINOR, [0-9]*)/define(_CLIENT_VERSION_MINOR, $MINOR)/g" configure.ac
+    sed -i "s/define(_CLIENT_VERSION_REVISION, [0-9]*)/define(_CLIENT_VERSION_REVISION, $REV)/g" configure.ac
+    echo "✔ configure.ac updated."
+else
+    echo "❌ Warning: configure.ac not found."
+fi
+
+# 4. Update Windows MSVC Config (The Windows Build System)
+echo "[3/3] Updating build_msvc/palladium_config.h..."
+MSVC_FILE="build_msvc/palladium_config.h"
+if [ -f "$MSVC_FILE" ]; then
+    sed -i "s/#define CLIENT_VERSION_MAJOR [0-9]*/#define CLIENT_VERSION_MAJOR $MAJOR/g" "$MSVC_FILE"
+    sed -i "s/#define CLIENT_VERSION_MINOR [0-9]*/#define CLIENT_VERSION_MINOR $MINOR/g" "$MSVC_FILE"
+    sed -i "s/#define CLIENT_VERSION_REVISION [0-9]*/#define CLIENT_VERSION_REVISION $REV/g" "$MSVC_FILE"
+    echo "✔ $MSVC_FILE updated."
+else
+    echo "❌ Warning: $MSVC_FILE not found."
+fi
+
+echo "========================================================"
+echo "Update Complete! Please run:"
+echo "1. make clean"
+echo "2. ./autogen.sh"
+echo "3. ./configure"
+echo "4. make"
+echo "========================================================"