diff --git a/MoreLinq.Test/Async/TestingAsyncSequence.cs b/MoreLinq.Test/Async/TestingAsyncSequence.cs
index af234111c..af1012b5f 100644
--- a/MoreLinq.Test/Async/TestingAsyncSequence.cs
+++ b/MoreLinq.Test/Async/TestingAsyncSequence.cs
@@ -67,7 +67,7 @@ void AssertDisposed()
             if (this.disposed is null)
                 return;
 
-            Assert.IsTrue(this.disposed, "Expected sequence to be disposed.");
+            Assert.That(this.disposed, Is.True, "Expected sequence to be disposed.");
             this.disposed = null;
         }
 
diff --git a/MoreLinq.Test/MoreLinq.Test.csproj b/MoreLinq.Test/MoreLinq.Test.csproj
index 0b6d42855..413e5e7f4 100644
--- a/MoreLinq.Test/MoreLinq.Test.csproj
+++ b/MoreLinq.Test/MoreLinq.Test.csproj
@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="6.0.0">
+    <PackageReference Include="coverlet.collector" Version="6.0.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
@@ -26,20 +26,20 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="NUnit" Version="3.14.0" />
-    <PackageReference Include="NUnit.Analyzers" Version="3.9.0">
+    <PackageReference Include="NUnit" Version="4.1.0" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.1.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="NUnitLite" Version="3.14.0" />
-    <PackageReference Include="PolySharp" Version="1.13.2">
+    <PackageReference Include="NUnitLite" Version="4.1.0" />
+    <PackageReference Include="PolySharp" Version="1.14.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="System.Reactive" Version="6.0.0" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' != 'net471'">
diff --git a/MoreLinq/MoreLinq.csproj b/MoreLinq/MoreLinq.csproj
index d21855c5e..6c1c604b5 100644
--- a/MoreLinq/MoreLinq.csproj
+++ b/MoreLinq/MoreLinq.csproj
@@ -161,8 +161,8 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
-    <PackageReference Include="PolySharp" Version="1.13.2" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
+    <PackageReference Include="PolySharp" Version="1.14.1" PrivateAssets="all" />
   </ItemGroup>
 
   <PropertyGroup>
diff --git a/bld/ExtensionsGenerator/MoreLinq.ExtensionsGenerator.csproj b/bld/ExtensionsGenerator/MoreLinq.ExtensionsGenerator.csproj
index 39132fd4d..a8c8964b0 100644
--- a/bld/ExtensionsGenerator/MoreLinq.ExtensionsGenerator.csproj
+++ b/bld/ExtensionsGenerator/MoreLinq.ExtensionsGenerator.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="docopt.net" Version="0.8.1" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.9.2" />
     <PackageReference Include="System.Collections.Immutable" Version="8.0.0" />
   </ItemGroup>
 </Project>