diff --git a/LiteDB/LiteDB.csproj b/LiteDB/LiteDB.csproj
index d3e245ddb..e8d0fef79 100644
--- a/LiteDB/LiteDB.csproj
+++ b/LiteDB/LiteDB.csproj
@@ -1,18 +1,18 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' ">
-    <TargetFrameworks>netstandard1.3;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0</TargetFrameworks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
-    <TargetFrameworks>net35;net40;netstandard1.3;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net40;netstandard2.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup>
     <PackageId>LiteDB</PackageId>
-    <Version>4.1.5</Version>
-    <AssemblyVersion>4.1.5.0</AssemblyVersion>
-    <FileVersion>4.1.5</FileVersion>
-    <VersionPrefix>4.1.5</VersionPrefix>
+    <Version>2024.0.1-uipath</Version>
+    <AssemblyVersion>2024.0.1</AssemblyVersion>
+    <FileVersion>2024.0.1</FileVersion>
+    <VersionPrefix>2024.0.1</VersionPrefix>
     <Authors>Maurício David</Authors>
     <Product>LiteDB</Product>
     <Description>LiteDB - A lightweight embedded .NET NoSQL document store in a single datafile</Description>
diff --git a/LiteDB/Mapper/BsonMapper.Deserialize.cs b/LiteDB/Mapper/BsonMapper.Deserialize.cs
index d540037a5..a62088d0b 100644
--- a/LiteDB/Mapper/BsonMapper.Deserialize.cs
+++ b/LiteDB/Mapper/BsonMapper.Deserialize.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Collections;
 using System.Collections.Generic;
@@ -156,9 +156,25 @@ internal object Deserialize(Type type, BsonValue value)
                 // test if value is object and has _type
                 if (doc.RawValue.TryGetValue("_type", out typeField))
                 {
-                    type = Type.GetType(typeField.AsString);
+                    var actualType = Type.GetType(typeField.AsString);
 
-                    if (type == null) throw LiteException.InvalidTypedName(typeField.AsString);
+                    if (actualType == null) throw LiteException.InvalidTypedName(typeField.AsString);
+
+                    // avoid initialize class that are not assignable 
+                    if (!type.IsAssignableFrom(actualType))
+                    {
+                        throw LiteException.DataTypeNotAssignable(type.FullName, actualType.FullName);
+                    }
+
+                    // avoid use of "System.Diagnostics.Process" in object type definition
+                    // using String test to work in .netstandard 1.3
+                    if (actualType.FullName.Equals("System.Diagnostics.Process", StringComparison.OrdinalIgnoreCase) &&
+                        actualType.Assembly.GetName().Name.Equals("System", StringComparison.OrdinalIgnoreCase))
+                    {
+                        throw LiteException.AvoidUseOfProcess();
+                    }
+
+                    type = actualType;
                 }
                 // when complex type has no definition (== typeof(object)) use Dictionary<string, object> to better set values
                 else if (type == typeof(object))
diff --git a/LiteDB/Utils/LiteException.cs b/LiteDB/Utils/LiteException.cs
index e614e49d0..fd6825022 100644
--- a/LiteDB/Utils/LiteException.cs
+++ b/LiteDB/Utils/LiteException.cs
@@ -38,6 +38,8 @@ public class LiteException : Exception
         public const int INVALID_TYPED_NAME = 207;
         public const int NEED_RECOVER = 208;
         public const int PROPERTY_READ_WRITE = 209;
+        public const int DATA_TYPE_NOT_ASSIGNABLE = 214;
+        public const int AVOID_USE_OF_PROCESS = 215;
 
         #endregion
 
@@ -207,6 +209,18 @@ internal static LiteException SyntaxError(StringScanner s, string message = "Une
             };
         }
 
+        internal static LiteException DataTypeNotAssignable(string type1, string type2)
+        {
+            {
+                return new LiteException(DATA_TYPE_NOT_ASSIGNABLE, $"Data type {type1} is not assignable from data type {type2}"); return new LiteException(DATA_TYPE_NOT_ASSIGNABLE, $"Data type {type1} is not assignable from data type {type2}");
+            }
+        }
+
+        internal static LiteException AvoidUseOfProcess()
+        {
+            return new LiteException(AVOID_USE_OF_PROCESS, $"LiteDB do not accept System.Diagnostics.Process class in deserialize mapper");
+        }
+
         #endregion
     }
 }
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diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 000000000..96b3496a6
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,27 @@
+version: 5.0.{build}
+branches:
+  only:
+  - master
+  - v4
+image: Visual Studio 2017
+configuration: 
+  - Debug
+  - Release
+before_build:
+  - cmd: nuget restore LiteDB.sln
+build:
+  project: LiteDB.sln
+  publish_nuget: true
+  verbosity: minimal
+# for:
+# -
+#   matrix:
+#     only:
+#       - configuration: Release
+#   artifacts:
+#     - path: LiteDB\bin\Release\LiteDB*.nupkg
+#   deploy:
+#   - provider: Webhook
+#     url: https://app.signpath.io/API/v1/f5b329b8-705f-4d6c-928a-19465b83716b/Integrations/AppVeyor?ProjectKey=LiteDB.git&SigningPolicyKey=release-signing
+#     authorization:
+#       secure: 3eLjGkpQC1wg1s5GIEqs7yk/V8OZNnpKmpwdsaloGExc5jMspM4nA7u/UlG5ugraEyXRC05ZxLU4FIfH2V2BEg==
\ No newline at end of file