diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e880f87..7a672d9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# v2.9.4
+- [#913](https://github.com/xmrig/xmrig/issues/913) Fixed Masari (MSR) support (this update required for upcoming fork).
+- [#915](https://github.com/xmrig/xmrig/pull/915) Improved security, JIT memory now read-only after patching.
+
 # v2.9.3
 - [#909](https://github.com/xmrig/xmrig/issues/909) Fixed compile errors on FreeBSD.
 - [#912](https://github.com/xmrig/xmrig/pull/912) Fixed, C++ implementation of `cn/half` was produce up to 13% of invalid hashes.
diff --git a/src/Mem.h b/src/Mem.h
index 21616a40..9e39e963 100644
--- a/src/Mem.h
+++ b/src/Mem.h
@@ -61,6 +61,7 @@ public:
     static void release(cryptonight_ctx **ctx, size_t count, MemInfo &info);
 
     static void *allocateExecutableMemory(size_t size);
+    static void protectExecutableMemory(void *p, size_t size);
     static void flushInstructionCache(void *p, size_t size);
 
     static inline bool isHugepagesAvailable() { return (m_flags & HugepagesAvailable) != 0; }
diff --git a/src/Mem_unix.cpp b/src/Mem_unix.cpp
index a30d9f72..833c200c 100644
--- a/src/Mem_unix.cpp
+++ b/src/Mem_unix.cpp
@@ -100,6 +100,12 @@ void *Mem::allocateExecutableMemory(size_t size)
 }
 
 
+void Mem::protectExecutableMemory(void *p, size_t size)
+{
+    mprotect(p, size, PROT_READ | PROT_EXEC);
+}
+
+
 void Mem::flushInstructionCache(void *p, size_t size)
 {
 #   ifndef __FreeBSD__
diff --git a/src/Mem_win.cpp b/src/Mem_win.cpp
index c43b2ce4..27c1348b 100644
--- a/src/Mem_win.cpp
+++ b/src/Mem_win.cpp
@@ -191,6 +191,13 @@ void *Mem::allocateExecutableMemory(size_t size)
 }
 
 
+void Mem::protectExecutableMemory(void *p, size_t size)
+{
+    DWORD oldProtect;
+    VirtualProtect(p, size, PAGE_EXECUTE_READ, &oldProtect);
+}
+
+
 void Mem::flushInstructionCache(void *p, size_t size)
 {
     ::FlushInstructionCache(GetCurrentProcess(), p, size);
diff --git a/src/common/net/Job.h b/src/common/net/Job.h
index 394727df..6922b0ce 100644
--- a/src/common/net/Job.h
+++ b/src/common/net/Job.h
@@ -6,7 +6,7 @@
  * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
  * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
  * Copyright 2018      Lee Clagett <https://github.com/vtnerd>
- * Copyright 2018      SChernykh   <https://github.com/SChernykh>
+ * Copyright 2018-2019 SChernykh   <https://github.com/SChernykh>
  * Copyright 2016-2019 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
  *
  *   This program is free software: you can redistribute it and/or modify
@@ -38,6 +38,10 @@
 class Job
 {
 public:
+    // Max blob size is 84 (75 fixed + 9 variable), aligned to 96. https://github.com/xmrig/xmrig/issues/1 Thanks fireice-uk.
+    // SECOR increase requirements for blob size: https://github.com/xmrig/xmrig/issues/913
+    static constexpr const size_t kMaxBlobSize = 128;
+
     Job();
     Job(int poolId, bool nicehash, const xmrig::Algorithm &algorithm, const xmrig::Id &clientId);
     ~Job();
@@ -95,7 +99,7 @@ private:
     size_t m_size;
     uint64_t m_diff;
     uint64_t m_target;
-    uint8_t m_blob[96]; // Max blob size is 84 (75 fixed + 9 variable), aligned to 96. https://github.com/xmrig/xmrig/issues/1 Thanks fireice-uk.
+    uint8_t m_blob[kMaxBlobSize];
     xmrig::Algorithm m_algorithm;
     xmrig::Id m_clientId;
     xmrig::Id m_id;
diff --git a/src/version.h b/src/version.h
index a401f517..eb520447 100644
--- a/src/version.h
+++ b/src/version.h
@@ -28,7 +28,7 @@
 #define APP_ID        "xmrig"
 #define APP_NAME      "XMRig"
 #define APP_DESC      "XMRig CPU miner"
-#define APP_VERSION   "2.9.3"
+#define APP_VERSION   "2.9.4-dev"
 #define APP_DOMAIN    "xmrig.com"
 #define APP_SITE      "www.xmrig.com"
 #define APP_COPYRIGHT "Copyright (C) 2016-2019 xmrig.com"
@@ -36,7 +36,7 @@
 
 #define APP_VER_MAJOR  2
 #define APP_VER_MINOR  9
-#define APP_VER_PATCH  3
+#define APP_VER_PATCH  4
 
 #ifdef _MSC_VER
 #   if (_MSC_VER >= 1910)
diff --git a/src/workers/CpuThread.cpp b/src/workers/CpuThread.cpp
index 082effe2..db02bda7 100644
--- a/src/workers/CpuThread.cpp
+++ b/src/workers/CpuThread.cpp
@@ -118,6 +118,7 @@ void xmrig::CpuThread::patchAsmVariants()
     patchCode(cn_half_mainloop_bulldozer_asm,           cnv2_mainloop_bulldozer_asm,            xmrig::CRYPTONIGHT_HALF_ITER,   xmrig::CRYPTONIGHT_MASK);
     patchCode(cn_half_double_mainloop_sandybridge_asm,  cnv2_double_mainloop_sandybridge_asm,   xmrig::CRYPTONIGHT_HALF_ITER,   xmrig::CRYPTONIGHT_MASK);
 
+    Mem::protectExecutableMemory(base, allocation_size);
     Mem::flushInstructionCache(base, allocation_size);
 }
 #endif
diff --git a/src/workers/MultiWorker.h b/src/workers/MultiWorker.h
index b9d07b52..a186f537 100644
--- a/src/workers/MultiWorker.h
+++ b/src/workers/MultiWorker.h
@@ -6,7 +6,7 @@
  * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
  * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
  * Copyright 2018      Lee Clagett <https://github.com/vtnerd>
- * Copyright 2018      SChernykh   <https://github.com/SChernykh>
+ * Copyright 2018-2019 SChernykh   <https://github.com/SChernykh>
  * Copyright 2016-2019 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
  *
  *   This program is free software: you can redistribute it and/or modify
@@ -60,7 +60,7 @@ private:
 
     struct State
     {
-        alignas(16) uint8_t blob[96 * N];
+        alignas(16) uint8_t blob[Job::kMaxBlobSize * N];
         Job job;
     };