Moved to Public transport package.

Assets/Scripts/Relay/RelayUtpSetup.cs

             RelayHMACKey        key                = ConvertHMACKeyBytes(hmacKeyBytes);
 
             m_endpointForServer = serverEndpoint;
-            var relayServerData = new RelayServerData(ref serverEndpoint, 0, ref allocationId, ref connectionData, ref hostConnectionData, ref key);
+            //TODO Implement DTLS 
+            bool isSecure = false;
+            var relayServerData = new RelayServerData(ref serverEndpoint, 0, ref allocationId, ref connectionData, ref hostConnectionData, ref key, isSecure);
             relayServerData.ComputeNewNonce();
             var relayNetworkParameter = new RelayNetworkParameter { ServerData = relayServerData };
 

Packages/manifest.json

     "com.unity.test-framework": "1.1.27",
     "com.unity.textmeshpro": "3.0.6",
     "com.unity.toolchain.win-x86_64-linux-x86_64": "0.1.20-preview",
-    "com.unity.transport": "1.0.0-pre.1",
+    "com.unity.transport": "1.0.0-pre.3",
     "com.unity.ugui": "1.0.0",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",

Packages/packages-lock.json

 {
   "dependencies": {
     "com.unity.burst": {
-      "version": "1.5.3",
-      "depth": 2,
+      "version": "1.5.5",
+      "depth": 1,
       "source": "registry",
       "dependencies": {
         "com.unity.mathematics": "1.2.1"
       "url": "https://packages.unity.com"
     },
     "com.unity.collections": {
-      "version": "1.0.0-pre.3",
+      "version": "1.0.0-pre.5",
-        "com.unity.burst": "1.5.3",
+        "com.unity.burst": "1.5.4",
         "com.unity.test-framework": "1.1.22"
       },
       "url": "https://packages.unity.com"
       "url": "https://packages.unity.com"
     },
     "com.unity.transport": {
-      "version": "file:com.unity.transport",
+      "version": "1.0.0-pre.3",
-      "source": "embedded",
+      "source": "registry",
-        "com.unity.collections": "1.0.0-pre.3",
-        "com.unity.burst": "1.5.1",
+        "com.unity.collections": "1.0.0-pre.5",
+        "com.unity.burst": "1.5.5",
-      }
+      },
+      "url": "https://packages.unity.com"
     },
     "com.unity.ugui": {
       "version": "1.0.0",