diff --git a/src/TypeNum.csproj b/src/TypeNum.csproj
index 1fb9a72..3baa5c4 100644
--- a/src/TypeNum.csproj
+++ b/src/TypeNum.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard1.4</TargetFramework>
-    <LangVersion>9.0</LangVersion>
+    <LangVersion>11.0</LangVersion>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 
@@ -22,9 +22,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Memory" Version="4.5.3" />
+    <PackageReference Include="System.Memory" Version="4.5.5" />
     <!-- The following is recommended for public projects -->
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/tests/TypeNum.Tests.csproj b/tests/TypeNum.Tests.csproj
index e06e2eb..1c9c635 100644
--- a/tests/TypeNum.Tests.csproj
+++ b/tests/TypeNum.Tests.csproj
@@ -10,9 +10,12 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
-    <PackageReference Include="xunit" Version="2.4.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
+    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup>