diff --git a/global.json b/global.json
index a11f48e..f4fd385 100644
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "10.0.0",
+    "version": "9.0.0",
     "rollForward": "latestMajor",
     "allowPrerelease": true
   }
diff --git a/src/KSFramework/Utilities/SecurityHelper.cs b/src/KSFramework/Utilities/SecurityHelper.cs
index a373aa9..a928ad6 100644
--- a/src/KSFramework/Utilities/SecurityHelper.cs
+++ b/src/KSFramework/Utilities/SecurityHelper.cs
@@ -16,9 +16,8 @@ public static string GetSha256Hash(string input)
 
     public static string GenerateToken(int byteLength = 32)
     {
-        var randomNumber = new byte[byteLength];
-        using var rng = RandomNumberGenerator.Create();
-        rng.GetBytes(randomNumber);
+        Span<byte> randomNumber = stackalloc byte[byteLength];
+        RandomNumberGenerator.Fill(randomNumber);
         return Convert.ToBase64String(randomNumber);
     }
 }
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