diff --git a/Tesses.WebServer.WebSocket/Class1.cs b/Tesses.WebServer.WebSocket/Class1.cs
index 7451b17..ea693d0 100644
--- a/Tesses.WebServer.WebSocket/Class1.cs
+++ b/Tesses.WebServer.WebSocket/Class1.cs
@@ -210,7 +210,7 @@ namespace Tesses.WebServer.WebSocket
   
     public class WebSocketServer
     {
-        Mutex mtx=new Mutex();
+       SemaphoreSlim semaphoreSlim=new SemaphoreSlim(1,1);
         bool hasInit=false;
         ServerContext context;
         public WebSocketServer(ServerContext ctx)
@@ -248,7 +248,7 @@ namespace Tesses.WebServer.WebSocket
         {
 
             while(!hasInit) ;
-            mtx.WaitOne();
+            await semaphoreSlim.WaitAsync();
             int opCode = msg.Binary ? 0x2 : 0x1;
         
             
@@ -276,12 +276,12 @@ namespace Tesses.WebServer.WebSocket
                 Array.Copy(msg.Data,i*4096,message,1+b.Length,r);
                 await context.NetworkStream.WriteAsync(message,0,message.Length);
             }
-            mtx.ReleaseMutex();
+            semaphoreSlim.Release();
         }
         private async Task PongSend(byte[] msg,long len)
         {
            
-            mtx.WaitOne();
+           await semaphoreSlim.WaitAsync();
                 int finField = 0b10000000 ;
                
                 byte firstByte= (byte)(finField | 0xA);
@@ -291,7 +291,7 @@ namespace Tesses.WebServer.WebSocket
                 Array.Copy(b,0,message,1,b.Length);
                 Array.Copy(msg,0,message,1+b.Length,len);
                 await context.NetworkStream.WriteAsync(message,0,message.Length);
-            mtx.ReleaseMutex();
+            semaphoreSlim.Release();
         }
         private string get_Sec_WebSocketAccept(string headerVal)
         {
@@ -328,7 +328,7 @@ namespace Tesses.WebServer.WebSocket
         
         public async Task Ping(byte[] ping)
         {
-            mtx.WaitOne();
+            await semaphoreSlim.WaitAsync();
             int finField = 0b10000000 ;
                
                 byte firstByte= (byte)(finField | 0x9);
@@ -338,7 +338,7 @@ namespace Tesses.WebServer.WebSocket
                 Array.Copy(b,0,message,1,b.Length);
                 Array.Copy(ping,0,message,1+b.Length,ping.Length);
                 await context.NetworkStream.WriteAsync(message,0,message.Length);
-            mtx.ReleaseMutex();
+            semaphoreSlim.Release();
         }
         private async Task<short> get_short()
         {
diff --git a/Tesses.WebServer.WebSocket/Tesses.WebServer.WebSocket.csproj b/Tesses.WebServer.WebSocket/Tesses.WebServer.WebSocket.csproj
index d2ac7e9..e04440d 100644
--- a/Tesses.WebServer.WebSocket/Tesses.WebServer.WebSocket.csproj
+++ b/Tesses.WebServer.WebSocket/Tesses.WebServer.WebSocket.csproj
@@ -5,9 +5,9 @@
     <PackageId>Tesses.WebServer.WebSocket</PackageId>
     <Author>Mike Nolan</Author>
     <Company>Tesses</Company>
-     <Version>1.0.1</Version>
-    <AssemblyVersion>1.0.1</AssemblyVersion>
-    <FileVersion>1.0.1</FileVersion>
+     <Version>1.0.1.1</Version>
+    <AssemblyVersion>1.0.1.1</AssemblyVersion>
+    <FileVersion>1.0.1.1</FileVersion>
     <Description>WebSockets for Tesses.WebServer</Description>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageTags>HTTP, WebServer, Website, WebSockets</PackageTags>