diff --git a/src/NEsper.Avro/NEsper.Avro.csproj b/src/NEsper.Avro/NEsper.Avro.csproj
index 10c4fc3ea..f839e212a 100644
--- a/src/NEsper.Avro/NEsper.Avro.csproj
+++ b/src/NEsper.Avro/NEsper.Avro.csproj
@@ -17,7 +17,7 @@
 
     <ItemGroup>
         <PackageReference Include="Apache.Avro" Version="1.11.0"/>
-        <PackageReference Include="Newtonsoft.Json" Version="10.0.3"/>
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.1"/>
     </ItemGroup>
 
     <ItemGroup>
diff --git a/tst/NEsper.Regression/NEsper.Regression.csproj b/tst/NEsper.Regression/NEsper.Regression.csproj
old mode 100755
new mode 100644
index 0c307b64d..ef6165673
--- a/tst/NEsper.Regression/NEsper.Regression.csproj
+++ b/tst/NEsper.Regression/NEsper.Regression.csproj
@@ -18,7 +18,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Newtonsoft.Json" Version="10.0.3"/>
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.1"/>
         <PackageReference Include="Npgsql" Version="4.0.8"/>
         <PackageReference Include="NUnit" Version="3.12.0"/>
         <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
diff --git a/tst/NEsper.Regression/packages.config b/tst/NEsper.Regression/packages.config
index bf56d407f..bff02c982 100644
--- a/tst/NEsper.Regression/packages.config
+++ b/tst/NEsper.Regression/packages.config
@@ -6,6 +6,6 @@
   <package id="Common.Logging.Log4Net208" version="3.4.1" targetFramework="net461" />
   <package id="log4net" version="2.0.10" targetFramework="net461" />
   <package id="Microsoft.CSharp" version="4.4.0" targetFramework="net461" />
-  <package id="Newtonsoft.Json" version="3.5.8" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net45" />
   <package id="NUnit" version="3.8.1" targetFramework="net461" />
 </packages>
\ No newline at end of file