diff --git a/src/Plivo/Plivo.csproj b/src/Plivo/Plivo.csproj
old mode 100755
new mode 100644
index 916d4719..96ff1cdc
--- a/src/Plivo/Plivo.csproj
+++ b/src/Plivo/Plivo.csproj
@@ -25,7 +25,7 @@
     <NoStdLib>false</NoStdLib>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="Microsoft.CSharp" Version="4.5.0" />
     <PackageReference Include="System.Text.Encoding.Extensions" Version="4.3.0" />
     <PackageReference Include="NuGet.Build.Packaging" Version="0.1.276" />
diff --git a/tests_netcore/Plivo.NetCore.Test/Plivo.NetCore.Test.csproj b/tests_netcore/Plivo.NetCore.Test/Plivo.NetCore.Test.csproj
old mode 100755
new mode 100644
index bc06909a..18baddfa
--- a/tests_netcore/Plivo.NetCore.Test/Plivo.NetCore.Test.csproj
+++ b/tests_netcore/Plivo.NetCore.Test/Plivo.NetCore.Test.csproj
@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="NUnit" Version="3.11.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="JWT" Version="6.1.4" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
       <PrivateAssets>all</PrivateAssets>