diff --git a/VERSION b/VERSION
index 4739c61..ad9e446 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.2.7
+4.2.8
diff --git a/clients/c/src/un.c b/clients/c/src/un.c
index bda0f64..7e58d48 100644
--- a/clients/c/src/un.c
+++ b/clients/c/src/un.c
@@ -6013,7 +6013,7 @@ void print_usage(const char *prog) {
  * ============================================================================ */
 
 const char *unsandbox_version(void) {
-    return "4.2.7";
+    return "4.2.8";
 }
 
 const char *unsandbox_detect_language(const char *filename) {
diff --git a/clients/csharp/examples/hello-mono.cs b/clients/csharp/examples/hello-mono.cs
new file mode 100644
index 0000000..ce37417
--- /dev/null
+++ b/clients/csharp/examples/hello-mono.cs
@@ -0,0 +1,15 @@
+// Hello World - C# with Mono (.NET Framework 4.0+)
+// Compile: mcs hello-mono.cs
+// Run: mono hello-mono.exe
+
+using System;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine("Hello from C# (Mono/.NET Framework)!");
+        Console.WriteLine("Runtime: " + Environment.Version);
+        Console.WriteLine("Platform: " + Environment.OSVersion.Platform);
+    }
+}
diff --git a/clients/groovy/sync/src/un.groovy b/clients/groovy/sync/src/un.groovy
index 971edcc..1e31c3c 100644
--- a/clients/groovy/sync/src/un.groovy
+++ b/clients/groovy/sync/src/un.groovy
@@ -72,7 +72,7 @@
  * </ol>
  *
  * @author Permacomputer Project
- * @version 4.2.7
+ * @version 4.2.8
  */
 
 import javax.crypto.Mac
diff --git a/clients/javascript/async/package.json b/clients/javascript/async/package.json
index b897b65..3f16a39 100644
--- a/clients/javascript/async/package.json
+++ b/clients/javascript/async/package.json
@@ -1,6 +1,6 @@
 {
   "name": "un-async",
-  "version": "4.2.7",
+  "version": "4.2.8",
   "description": "Unsandbox async JavaScript SDK - Execute code in 50+ languages",
   "main": "src/un_async.js",
   "type": "module",
diff --git a/clients/lua/sync/src/un.lua b/clients/lua/sync/src/un.lua
index f486743..1057e20 100644
--- a/clients/lua/sync/src/un.lua
+++ b/clients/lua/sync/src/un.lua
@@ -15,7 +15,7 @@ local ltn12 = require("ltn12")
 
 local Un = {}
 Un.API_BASE = "https://api.unsandbox.com"
-Un.VERSION = "4.2.7"
+Un.VERSION = "4.2.8"
 
 -- Credential loading
 function Un.load_accounts_csv(path)
diff --git a/clients/perl/sync/src/un.pl b/clients/perl/sync/src/un.pl
index cb2caab..f16d812 100644
--- a/clients/perl/sync/src/un.pl
+++ b/clients/perl/sync/src/un.pl
@@ -47,7 +47,7 @@ use Digest::HMAC_SHA256 qw(hmac_sha256_hex);
 use File::HomeDir;
 use Time::HiRes qw(time sleep);
 
-our $VERSION = "4.2.7";
+our $VERSION = "4.2.8";
 our $API_BASE = 'https://api.unsandbox.com';
 
 # Credential system
diff --git a/clients/python/async/setup.py b/clients/python/async/setup.py
index ca3ab1e..dfe2ac0 100644
--- a/clients/python/async/setup.py
+++ b/clients/python/async/setup.py
@@ -7,7 +7,7 @@ from setuptools import setup, find_packages
 
 setup(
     name="unsandbox-async",
-    version="4.2.7",
+    version="4.2.8",
     description="Asynchronous Python SDK for unsandbox.com code execution",
     long_description=open("README.md").read() if False else "Async Python SDK for unsandbox code execution",
     author="unsandbox.com",
diff --git a/clients/python/sync/setup.py b/clients/python/sync/setup.py
index 117c27f..fa509c2 100644
--- a/clients/python/sync/setup.py
+++ b/clients/python/sync/setup.py
@@ -7,7 +7,7 @@ with open("README.md", "r", encoding="utf-8") as fh:
 
 setup(
     name="unsandbox",
-    version="4.2.7",
+    version="4.2.8",
     author="Unsandbox",
     description="Synchronous Python SDK for unsandbox.com code execution",
     long_description=long_description,
diff --git a/clients/python/sync/src/__init__.py b/clients/python/sync/src/__init__.py
index 9aa5eaf..5458c40 100644
--- a/clients/python/sync/src/__init__.py
+++ b/clients/python/sync/src/__init__.py
@@ -27,7 +27,7 @@ from .un import (
     CredentialsError,
 )
 
-__version__ = "4.2.7"
+__version__ = "4.2.8"
 __all__ = [
     "execute_code",
     "execute_async",
diff --git a/clients/rust/async/Cargo.toml b/clients/rust/async/Cargo.toml
index 6913d7c..3074077 100644
--- a/clients/rust/async/Cargo.toml
+++ b/clients/rust/async/Cargo.toml
@@ -7,7 +7,7 @@
 
 [package]
 name = "un-async"
-version = "4.2.7"
+version = "4.2.8"
 edition = "2021"
 authors = ["unsandbox.com"]
 description = "Asynchronous Rust SDK for unsandbox.com secure code execution API"
diff --git a/clients/rust/sync/Cargo.toml b/clients/rust/sync/Cargo.toml
index ccc64de..da5a172 100644
--- a/clients/rust/sync/Cargo.toml
+++ b/clients/rust/sync/Cargo.toml
@@ -7,7 +7,7 @@
 
 [package]
 name = "un-sync"
-version = "4.2.7"
+version = "4.2.8"
 edition = "2021"
 authors = ["unsandbox.com"]
 description = "Synchronous Rust SDK for unsandbox.com secure code execution API"