diff --git a/README.md b/README.md
index 13ab7d0..c1a0d08 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Xvirus SDK C#
 
-Xvirus SDK 4.2 C# bindings.
+Xvirus SDK 4.2.1 C# bindings.
 
 ## Table of Contents
 
@@ -41,6 +41,9 @@ The following Operating Systems are supported:
 
 ## Changelog
 
+- Version **4.2.1**:
+  - Optimized scanning speed of big files
+  - Optimized scanning speed in Linux version
 - Version **4.2**:
   - Reduced glibc minimum version to 2.17 on Linux
   - Added "Logging()" function to enable/disable logging
diff --git a/bin/BaseLibrary.dll b/bin/BaseLibrary.dll
index 8ca2cc8..4d2a04d 100644
Binary files a/bin/BaseLibrary.dll and b/bin/BaseLibrary.dll differ
diff --git a/bin/XvirusSDK.deps.json b/bin/XvirusSDK.deps.json
index 2eaf294..3492f17 100644
--- a/bin/XvirusSDK.deps.json
+++ b/bin/XvirusSDK.deps.json
@@ -6,7 +6,7 @@
   "compilationOptions": {},
   "targets": {
     ".NETCoreApp,Version=v7.0": {
-      "XvirusSDK/4.2.0.0": {
+      "XvirusSDK/4.2.1.0": {
         "dependencies": {
           "BaseLibrary": "1.0.0"
         },
@@ -1041,13 +1041,16 @@
           "PeNet": "1.6.1"
         },
         "runtime": {
-          "BaseLibrary.dll": {}
+          "BaseLibrary.dll": {
+            "assemblyVersion": "1.0.0",
+            "fileVersion": "1.0.0.0"
+          }
         }
       }
     }
   },
   "libraries": {
-    "XvirusSDK/4.2.0.0": {
+    "XvirusSDK/4.2.1.0": {
       "type": "project",
       "serviceable": false,
       "sha512": ""
diff --git a/bin/XvirusSDK.dll b/bin/XvirusSDK.dll
index 86cc0b4..a8ce74f 100644
Binary files a/bin/XvirusSDK.dll and b/bin/XvirusSDK.dll differ