diff --git a/Apps/DropRequestsApp/App.cs b/Apps/DropRequestsApp/App.cs
index 724bbbf6..a542f27e 100644
--- a/Apps/DropRequestsApp/App.cs
+++ b/Apps/DropRequestsApp/App.cs
@@ -18,12 +18,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 using DnsServerCore.ApplicationCommon;
-using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Net;
+using System.Text.Json;
 using System.Threading.Tasks;
+using TechnitiumLibrary;
 using TechnitiumLibrary.Net;
 using TechnitiumLibrary.Net.Dns;
 using TechnitiumLibrary.Net.Dns.ResourceRecords;
@@ -55,64 +56,32 @@ namespace DropRequests
 
         public async Task InitializeAsync(IDnsServer dnsServer, string config)
         {
-            dynamic jsonConfig = JsonConvert.DeserializeObject(config);
+            using JsonDocument jsonDocument = JsonDocument.Parse(config);
+            JsonElement jsonConfig = jsonDocument.RootElement;
 
-            _enableBlocking = jsonConfig.enableBlocking.Value;
+            _enableBlocking = jsonConfig.GetProperty("enableBlocking").GetBoolean();
 
-            if (jsonConfig.dropMalformedRequests is null)
+            if (jsonConfig.TryGetProperty("dropMalformedRequests", out JsonElement jsonDropMalformedRequests))
+                _dropMalformedRequests = jsonDropMalformedRequests.GetBoolean();
+            else
                 _dropMalformedRequests = false;
-            else
-                _dropMalformedRequests = jsonConfig.dropMalformedRequests.Value;
-
-            if (jsonConfig.allowedNetworks is null)
-            {
-                _allowedNetworks = Array.Empty<NetworkAddress>();
-            }
-            else
-            {
-                List<NetworkAddress> allowedNetworks = new List<NetworkAddress>();
-
-                foreach (dynamic allowedNetwork in jsonConfig.allowedNetworks)
-                {
-                    allowedNetworks.Add(NetworkAddress.Parse(allowedNetwork.Value));
-                }
 
+            if (jsonConfig.TryReadArray("allowedNetworks", NetworkAddress.Parse, out NetworkAddress[] allowedNetworks))
                 _allowedNetworks = allowedNetworks;
-            }
-
-            if (jsonConfig.blockedNetworks is null)
-            {
-                _blockedNetworks = Array.Empty<NetworkAddress>();
-            }
             else
-            {
-                List<NetworkAddress> blockedNetworks = new List<NetworkAddress>();
-
-                foreach (dynamic blockedNetwork in jsonConfig.blockedNetworks)
-                {
-                    blockedNetworks.Add(NetworkAddress.Parse(blockedNetwork.Value));
-                }
+                _allowedNetworks = Array.Empty<NetworkAddress>();
 
+            if (jsonConfig.TryReadArray("blockedNetworks", NetworkAddress.Parse, out NetworkAddress[] blockedNetworks))
                 _blockedNetworks = blockedNetworks;
-            }
-
-            if (jsonConfig.blockedQuestions is null)
-            {
-                _blockedQuestions = Array.Empty<BlockedQuestion>();
-            }
             else
-            {
-                List<BlockedQuestion> blockedQuestions = new List<BlockedQuestion>();
-
-                foreach (dynamic blockedQuestion in jsonConfig.blockedQuestions)
-                {
-                    blockedQuestions.Add(new BlockedQuestion(blockedQuestion));
-                }
+                _blockedNetworks = Array.Empty<NetworkAddress>();
 
+            if (jsonConfig.TryReadArray("blockedQuestions", delegate (JsonElement blockedQuestion) { return new BlockedQuestion(blockedQuestion); }, out BlockedQuestion[] blockedQuestions))
                 _blockedQuestions = blockedQuestions;
-            }
+            else
+                _blockedQuestions = Array.Empty<BlockedQuestion>();
 
-            if (jsonConfig.dropMalformedRequests is null)
+            if (!jsonConfig.TryGetProperty("dropMalformedRequests", out _))
             {
                 config = config.Replace("\"allowedNetworks\"", "\"dropMalformedRequests\": false,\r\n  \"allowedNetworks\"");
 
@@ -177,17 +146,15 @@ namespace DropRequests
 
             #region constructor
 
-            public BlockedQuestion(dynamic jsonQuestion)
+            public BlockedQuestion(JsonElement jsonQuestion)
             {
-                _name = jsonQuestion.name?.Value;
-                if (_name is not null)
-                    _name = _name.TrimEnd('.');
+                if (jsonQuestion.TryGetProperty("name", out JsonElement jsonName))
+                    _name = jsonName.GetString().TrimEnd('.');
 
-                if (jsonQuestion.blockZone is not null)
-                    _blockZone = jsonQuestion.blockZone.Value;
+                if (jsonQuestion.TryGetProperty("blockZone", out JsonElement jsonBlockZone))
+                    _blockZone = jsonBlockZone.GetBoolean();
 
-                string strType = jsonQuestion.type?.Value;
-                if (!string.IsNullOrEmpty(strType) && Enum.TryParse(strType, true, out DnsResourceRecordType type))
+                if (jsonQuestion.TryGetProperty("type", out JsonElement jsonType) && Enum.TryParse(jsonType.GetString(), true, out DnsResourceRecordType type))
                     _type = type;
                 else
                     _type = DnsResourceRecordType.Unknown;