diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 49b51f1691..6a1c44f64e 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -5,7 +5,7 @@
     <Copyright>2015-2023 The Neo Project</Copyright>
     <VersionPrefix>3.6.2</VersionPrefix>
     <Authors>The Neo Project</Authors>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFrameworks>net7.0</TargetFrameworks>
     <PackageProjectUrl>https://github.com/neo-project/neo</PackageProjectUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
diff --git a/src/Neo.VM/Neo.VM.csproj b/src/Neo.VM/Neo.VM.csproj
index 5e7e071b22..add3762a3e 100644
--- a/src/Neo.VM/Neo.VM.csproj
+++ b/src/Neo.VM/Neo.VM.csproj
@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.1;net7.0</TargetFrameworks>
+    <LangVersion>9.0</LangVersion>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Nullable>enable</Nullable>
   </PropertyGroup>