diff --git a/cpp/autobuilder/Semmle.Autobuild.Cpp.Tests/Semmle.Autobuild.Cpp.Tests.csproj b/cpp/autobuilder/Semmle.Autobuild.Cpp.Tests/Semmle.Autobuild.Cpp.Tests.csproj
index 0feecf0c876..1fe010dc3fc 100644
--- a/cpp/autobuilder/Semmle.Autobuild.Cpp.Tests/Semmle.Autobuild.Cpp.Tests.csproj
+++ b/cpp/autobuilder/Semmle.Autobuild.Cpp.Tests/Semmle.Autobuild.Cpp.Tests.csproj
@@ -11,12 +11,12 @@
   <ItemGroup>
     <PackageReference Include="System.IO.FileSystem" Version="4.3.0" />
     <PackageReference Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+    <PackageReference Include="xunit" Version="2.6.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/cpp/autobuilder/Semmle.Autobuild.Cpp/Semmle.Autobuild.Cpp.csproj b/cpp/autobuilder/Semmle.Autobuild.Cpp/Semmle.Autobuild.Cpp.csproj
index 72aba1b7950..99e49a2f0a7 100644
--- a/cpp/autobuilder/Semmle.Autobuild.Cpp/Semmle.Autobuild.Cpp.csproj
+++ b/cpp/autobuilder/Semmle.Autobuild.Cpp/Semmle.Autobuild.Cpp.csproj
@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Build" Version="17.3.2" />
+    <PackageReference Include="Microsoft.Build" Version="17.8.3" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/csharp/autobuilder/Semmle.Autobuild.CSharp.Tests/Semmle.Autobuild.CSharp.Tests.csproj b/csharp/autobuilder/Semmle.Autobuild.CSharp.Tests/Semmle.Autobuild.CSharp.Tests.csproj
index 61856619c44..06db1a3b722 100644
--- a/csharp/autobuilder/Semmle.Autobuild.CSharp.Tests/Semmle.Autobuild.CSharp.Tests.csproj
+++ b/csharp/autobuilder/Semmle.Autobuild.CSharp.Tests/Semmle.Autobuild.CSharp.Tests.csproj
@@ -8,12 +8,12 @@
 	<ItemGroup>
 		<PackageReference Include="System.IO.FileSystem" Version="4.3.0" />
 		<PackageReference Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
-		<PackageReference Include="xunit" Version="2.4.2" />
-		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+		<PackageReference Include="xunit" Version="2.6.2" />
+		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
 		</PackageReference>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
 	</ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\Semmle.Autobuild.CSharp\Semmle.Autobuild.CSharp.csproj" />
diff --git a/csharp/autobuilder/Semmle.Autobuild.CSharp/Semmle.Autobuild.CSharp.csproj b/csharp/autobuilder/Semmle.Autobuild.CSharp/Semmle.Autobuild.CSharp.csproj
index 68eea83be8e..dbbe8c80471 100644
--- a/csharp/autobuilder/Semmle.Autobuild.CSharp/Semmle.Autobuild.CSharp.csproj
+++ b/csharp/autobuilder/Semmle.Autobuild.CSharp/Semmle.Autobuild.CSharp.csproj
@@ -3,9 +3,9 @@
 		<TargetFramework>net8.0</TargetFramework>
 		<AssemblyName>Semmle.Autobuild.CSharp</AssemblyName>
 		<RootNamespace>Semmle.Autobuild.CSharp</RootNamespace>
-		<ApplicationIcon/>
+		<ApplicationIcon />
 		<OutputType>Exe</OutputType>
-		<StartupObject/>
+		<StartupObject />
 		<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
 		<RuntimeIdentifiers>win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
 		<Nullable>enable</Nullable>
@@ -14,8 +14,8 @@
 		<Folder Include="Properties\" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Build" Version="17.3.2" />
-		<PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
+		<PackageReference Include="Microsoft.Build" Version="17.8.3" />
+		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
 	</ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\..\extractor\Semmle.Util\Semmle.Util.csproj" />
diff --git a/csharp/autobuilder/Semmle.Autobuild.Shared/Semmle.Autobuild.Shared.csproj b/csharp/autobuilder/Semmle.Autobuild.Shared/Semmle.Autobuild.Shared.csproj
index b552a6fd624..79c652a8a4e 100644
--- a/csharp/autobuilder/Semmle.Autobuild.Shared/Semmle.Autobuild.Shared.csproj
+++ b/csharp/autobuilder/Semmle.Autobuild.Shared/Semmle.Autobuild.Shared.csproj
@@ -11,7 +11,7 @@
 		<Folder Include="Properties\" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Build" Version="17.3.2" />
+		<PackageReference Include="Microsoft.Build" Version="17.8.3" />
 	</ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\..\extractor\Semmle.Util\Semmle.Util.csproj" />
diff --git a/csharp/extractor/Semmle.Extraction.CIL/Semmle.Extraction.CIL.csproj b/csharp/extractor/Semmle.Extraction.CIL/Semmle.Extraction.CIL.csproj
index fa6d108266a..a952ea2d3dd 100644
--- a/csharp/extractor/Semmle.Extraction.CIL/Semmle.Extraction.CIL.csproj
+++ b/csharp/extractor/Semmle.Extraction.CIL/Semmle.Extraction.CIL.csproj
@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.DiaSymReader" Version="1.4.0" />
+    <PackageReference Include="Microsoft.DiaSymReader" Version="2.0.0" />
     <PackageReference Include="Microsoft.DiaSymReader.Native" Version="1.7.0" />
     <PackageReference Include="Microsoft.DiaSymReader.PortablePdb" Version="1.6.0"><IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 <PrivateAssets>all</PrivateAssets>
diff --git a/csharp/extractor/Semmle.Extraction.CSharp.Standalone/Semmle.Extraction.CSharp.Standalone.csproj b/csharp/extractor/Semmle.Extraction.CSharp.Standalone/Semmle.Extraction.CSharp.Standalone.csproj
index d737a4ecefc..c2d37b414d6 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp.Standalone/Semmle.Extraction.CSharp.Standalone.csproj
+++ b/csharp/extractor/Semmle.Extraction.CSharp.Standalone/Semmle.Extraction.CSharp.Standalone.csproj
@@ -6,7 +6,7 @@
 		<RootNamespace>Semmle.Extraction.CSharp.Standalone</RootNamespace>
 		<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
 		<TreatWarningsAsErrors>false</TreatWarningsAsErrors>
-		<WarningsAsErrors/>
+		<WarningsAsErrors />
 		<RuntimeIdentifiers>win-x64;linux-x64;osx-x64</RuntimeIdentifiers>
 		<Nullable>enable</Nullable>
 	</PropertyGroup>
@@ -19,7 +19,7 @@
 		<Folder Include="Properties\" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Build" Version="17.3.2" />
+		<PackageReference Include="Microsoft.Build" Version="17.8.3" />
 		<PackageReference Include="Microsoft.Win32.Primitives" Version="4.3.0" />
 		<PackageReference Include="System.Net.Primitives" Version="4.3.1" />
 		<PackageReference Include="System.Security.Principal" Version="4.3.0" />
diff --git a/csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/Semmle.Extraction.CSharp.StubGenerator.csproj b/csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/Semmle.Extraction.CSharp.StubGenerator.csproj
index d7c5c7320e2..5788fff3476 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/Semmle.Extraction.CSharp.StubGenerator.csproj
+++ b/csharp/extractor/Semmle.Extraction.CSharp.StubGenerator/Semmle.Extraction.CSharp.StubGenerator.csproj
@@ -13,6 +13,6 @@
 		<ProjectReference Include="..\Semmle.Extraction.CSharp.Util\Semmle.Extraction.CSharp.Util.csproj" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" />
+		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
 	</ItemGroup>
 </Project>
diff --git a/csharp/extractor/Semmle.Extraction.CSharp.Util/Semmle.Extraction.CSharp.Util.csproj b/csharp/extractor/Semmle.Extraction.CSharp.Util/Semmle.Extraction.CSharp.Util.csproj
index 94b7fe44f50..67c8a9da34c 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp.Util/Semmle.Extraction.CSharp.Util.csproj
+++ b/csharp/extractor/Semmle.Extraction.CSharp.Util/Semmle.Extraction.CSharp.Util.csproj
@@ -12,6 +12,6 @@
 		<ProjectReference Include="..\Semmle.Util\Semmle.Util.csproj" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" />
+		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
 	</ItemGroup>
 </Project>
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Semmle.Extraction.CSharp.csproj b/csharp/extractor/Semmle.Extraction.CSharp/Semmle.Extraction.CSharp.csproj
index ce784c5c977..17943c6e21b 100644
--- a/csharp/extractor/Semmle.Extraction.CSharp/Semmle.Extraction.CSharp.csproj
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Semmle.Extraction.CSharp.csproj
@@ -18,7 +18,7 @@
 		<Folder Include="Properties\" />
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" />
-		<PackageReference Include="Microsoft.Build" Version="17.3.2" />
+		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
+		<PackageReference Include="Microsoft.Build" Version="17.8.3" />
 	</ItemGroup>
 </Project>
diff --git a/csharp/extractor/Semmle.Extraction.Tests/Semmle.Extraction.Tests.csproj b/csharp/extractor/Semmle.Extraction.Tests/Semmle.Extraction.Tests.csproj
index 7bda661e579..930747bb8c0 100644
--- a/csharp/extractor/Semmle.Extraction.Tests/Semmle.Extraction.Tests.csproj
+++ b/csharp/extractor/Semmle.Extraction.Tests/Semmle.Extraction.Tests.csproj
@@ -8,12 +8,12 @@
 	<ItemGroup>
 		<PackageReference Include="System.IO.FileSystem" Version="4.3.0" />
 		<PackageReference Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
-		<PackageReference Include="xunit" Version="2.4.2" />
-		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+		<PackageReference Include="xunit" Version="2.6.2" />
+		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
 		</PackageReference>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
 	</ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\Semmle.Extraction.CSharp.StubGenerator\Semmle.Extraction.CSharp.StubGenerator.csproj" />
diff --git a/csharp/extractor/Semmle.Extraction/Semmle.Extraction.csproj b/csharp/extractor/Semmle.Extraction/Semmle.Extraction.csproj
index 01299b40ace..2c70eccbafd 100644
--- a/csharp/extractor/Semmle.Extraction/Semmle.Extraction.csproj
+++ b/csharp/extractor/Semmle.Extraction/Semmle.Extraction.csproj
@@ -12,9 +12,9 @@
 		<DefineConstants>TRACE;DEBUG;DEBUG_LABELS</DefineConstants>
 	</PropertyGroup>
 	<ItemGroup>
-		<PackageReference Include="Microsoft.Build" Version="17.3.2" />
-		<PackageReference Include="Microsoft.CodeAnalysis" Version="4.4.0" />
-		<PackageReference Include="GitInfo" Version="2.2.0">
+		<PackageReference Include="Microsoft.Build" Version="17.8.3" />
+		<PackageReference Include="Microsoft.CodeAnalysis" Version="4.8.0" />
+		<PackageReference Include="GitInfo" Version="3.3.3">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 			<PrivateAssets>all</PrivateAssets>
 		</PackageReference>
diff --git a/csharp/extractor/Semmle.Util.Tests/Semmle.Util.Tests.csproj b/csharp/extractor/Semmle.Util.Tests/Semmle.Util.Tests.csproj
index b8e994c90fd..8ec1bc9030b 100644
--- a/csharp/extractor/Semmle.Util.Tests/Semmle.Util.Tests.csproj
+++ b/csharp/extractor/Semmle.Util.Tests/Semmle.Util.Tests.csproj
@@ -6,12 +6,12 @@
 		<Nullable>enable</Nullable>
 	</PropertyGroup>
 	<ItemGroup>
-		<PackageReference Include="xunit" Version="2.4.2" />
-		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+		<PackageReference Include="xunit" Version="2.6.2" />
+		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
 		</PackageReference>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
 	</ItemGroup>
 	<ItemGroup>
 		<ProjectReference Include="..\Semmle.Util\Semmle.Util.csproj" />
diff --git a/csharp/extractor/Semmle.Util/Semmle.Util.csproj b/csharp/extractor/Semmle.Util/Semmle.Util.csproj
index fdff1abe251..a3c7a5aba55 100644
--- a/csharp/extractor/Semmle.Util/Semmle.Util.csproj
+++ b/csharp/extractor/Semmle.Util/Semmle.Util.csproj
@@ -15,7 +15,7 @@
 
   <ItemGroup>
     <PackageReference Include="Mono.Posix.NETStandard" Version="1.0.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
 
 </Project>
diff --git a/csharp/ql/integration-tests/posix-only/dotnet_test/dotnet_test.csproj b/csharp/ql/integration-tests/posix-only/dotnet_test/dotnet_test.csproj
index 84d84514ff8..385a784dce0 100644
--- a/csharp/ql/integration-tests/posix-only/dotnet_test/dotnet_test.csproj
+++ b/csharp/ql/integration-tests/posix-only/dotnet_test/dotnet_test.csproj
@@ -7,10 +7,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
-    <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.3.0" />
-    <PackageReference Include="coverlet.collector" Version="3.2.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
   </ItemGroup>
 
   <Target Name="DeleteBinObjFolders" BeforeTargets="Clean">
diff --git a/csharp/ql/integration-tests/posix-only/dotnet_test_mstest/dotnet_test_mstest.csproj b/csharp/ql/integration-tests/posix-only/dotnet_test_mstest/dotnet_test_mstest.csproj
index 2a0a398c135..acbb9e7fe2b 100644
--- a/csharp/ql/integration-tests/posix-only/dotnet_test_mstest/dotnet_test_mstest.csproj
+++ b/csharp/ql/integration-tests/posix-only/dotnet_test_mstest/dotnet_test_mstest.csproj
@@ -11,10 +11,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
-    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.1.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.1.1" />
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
   </ItemGroup>
 
 </Project>
diff --git a/csharp/ql/integration-tests/posix-only/standalone_dependencies/standalone.csproj b/csharp/ql/integration-tests/posix-only/standalone_dependencies/standalone.csproj
index a2c13f5755b..a8f3cc44512 100644
--- a/csharp/ql/integration-tests/posix-only/standalone_dependencies/standalone.csproj
+++ b/csharp/ql/integration-tests/posix-only/standalone_dependencies/standalone.csproj
@@ -11,9 +11,9 @@
   </Target>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <!-- The below causes DB-CHECK errors: -->
     <!-- <PackageReference Include="NUnit" Version="3.10.1" /> -->
-    <PackageReference Include="Avalara.AvaTax" Version="21.10.0" />
+    <PackageReference Include="Avalara.AvaTax" Version="23.11.0" />
   </ItemGroup>
 </Project>
diff --git a/csharp/ql/integration-tests/windows-only/standalone_dependencies/standalone.csproj b/csharp/ql/integration-tests/windows-only/standalone_dependencies/standalone.csproj
index a2c13f5755b..a8f3cc44512 100644
--- a/csharp/ql/integration-tests/windows-only/standalone_dependencies/standalone.csproj
+++ b/csharp/ql/integration-tests/windows-only/standalone_dependencies/standalone.csproj
@@ -11,9 +11,9 @@
   </Target>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <!-- The below causes DB-CHECK errors: -->
     <!-- <PackageReference Include="NUnit" Version="3.10.1" /> -->
-    <PackageReference Include="Avalara.AvaTax" Version="21.10.0" />
+    <PackageReference Include="Avalara.AvaTax" Version="23.11.0" />
   </ItemGroup>
 </Project>