diff --git a/Directory.Build.props b/Directory.Build.props
index 7495249..0cd03be 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -6,7 +6,7 @@
          NU1107 restore failure. Referenced as Version="$(RoslynVersion)" in each csproj.
          NOTE: the netstandard2.0 analyzer projects pin Microsoft.CodeAnalysis.CSharp at a lower
          version on purpose (built against the host Roslyn) — they do NOT use this property. -->
-    <RoslynVersion>5.3.0</RoslynVersion>
+    <RoslynVersion>5.9.0</RoslynVersion>
 
     <MinVerTagPrefix>v</MinVerTagPrefix>
     <Authors>Doug Bryant</Authors>
@@ -28,7 +28,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MinVer" Version="6.0.0">
+    <PackageReference Include="MinVer" Version="6.1.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
diff --git a/src/Parlance.Analysis/Parlance.Analysis.csproj b/src/Parlance.Analysis/Parlance.Analysis.csproj
index 58ec119..9f6722d 100644
--- a/src/Parlance.Analysis/Parlance.Analysis.csproj
+++ b/src/Parlance.Analysis/Parlance.Analysis.csproj
@@ -14,9 +14,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.8" />
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.11" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="$(RoslynVersion)" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.11" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.11" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Parlance.Analyzers.Upstream/Parlance.Analyzers.Upstream.csproj b/src/Parlance.Analyzers.Upstream/Parlance.Analyzers.Upstream.csproj
index 87a0f53..bda2e51 100644
--- a/src/Parlance.Analyzers.Upstream/Parlance.Analyzers.Upstream.csproj
+++ b/src/Parlance.Analyzers.Upstream/Parlance.Analyzers.Upstream.csproj
@@ -25,23 +25,23 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='net8.0'">
-    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.300" GeneratePathProperty="true" ExcludeAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.400" GeneratePathProperty="true" ExcludeAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeStyle" Version="$(RoslynVersion)" GeneratePathProperty="true" ExcludeAssets="all" />
-    <PackageReference Include="Roslynator.Analyzers" Version="4.15.0" GeneratePathProperty="true" ExcludeAssets="all" />
+    <PackageReference Include="Roslynator.Analyzers" Version="4.16.1" GeneratePathProperty="true" ExcludeAssets="all" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='net10.0'">
-    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.300"
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.400"
                       GeneratePathProperty="true" ExcludeAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeStyle" Version="$(RoslynVersion)"
                       GeneratePathProperty="true" ExcludeAssets="all" />
-    <PackageReference Include="Roslynator.Analyzers" Version="4.15.0"
+    <PackageReference Include="Roslynator.Analyzers" Version="4.16.1"
                       GeneratePathProperty="true" ExcludeAssets="all" />
     <!-- CodeStyle fix providers reference Microsoft.Bcl.AsyncInterfaces 9.0.0 as a transitive dep.
          That version is not in the NuGet cache; we ship 10.0.0 instead. The custom AssemblyLoadContext
          Resolving handler returns it regardless of the requested version, which works because all
          types are type-forwarded to System.Runtime on net10.0. -->
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.8"
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.11"
                       GeneratePathProperty="true" ExcludeAssets="all" />
   </ItemGroup>
 
diff --git a/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj b/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj
index 16018c3..3ba08cf 100644
--- a/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj
+++ b/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj
@@ -25,7 +25,7 @@
          (the .NET SDK's csc), or they are silently disabled with CS9057. The .NET 10
          SDK ships Roslyn 5.0, so this stays at 4.12.0 for broad host compatibility —
          do not let dependabot bump it above the lowest supported Roslyn. -->
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.9.0" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Parlance.CSharp.Package/Parlance.CSharp.Package.csproj b/src/Parlance.CSharp.Package/Parlance.CSharp.Package.csproj
index bca587f..698d1b6 100644
--- a/src/Parlance.CSharp.Package/Parlance.CSharp.Package.csproj
+++ b/src/Parlance.CSharp.Package/Parlance.CSharp.Package.csproj
@@ -22,10 +22,10 @@
   <ItemGroup>
     <ProjectReference Include="..\Parlance.CSharp.Analyzers\Parlance.CSharp.Analyzers.csproj"
                       PrivateAssets="none" />
-    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.300">
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.400">
       <PrivateAssets>none</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Roslynator.Analyzers" Version="4.15.0">
+    <PackageReference Include="Roslynator.Analyzers" Version="4.16.1">
       <PrivateAssets>none</PrivateAssets>
     </PackageReference>
   </ItemGroup>
diff --git a/src/Parlance.CSharp.Workspace/Parlance.CSharp.Workspace.csproj b/src/Parlance.CSharp.Workspace/Parlance.CSharp.Workspace.csproj
index 3dc9faa..86f9a59 100644
--- a/src/Parlance.CSharp.Workspace/Parlance.CSharp.Workspace.csproj
+++ b/src/Parlance.CSharp.Workspace/Parlance.CSharp.Workspace.csproj
@@ -16,11 +16,11 @@
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(RoslynVersion)" />
     <PackageReference Include="Microsoft.CodeAnalysis.Features" Version="$(RoslynVersion)" />
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.11" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Krafs.Publicizer" Version="2.3.0" PrivateAssets="all" />
+    <PackageReference Include="Krafs.Publicizer" Version="2.3.2" PrivateAssets="all" />
     <Publicize Include="Microsoft.CodeAnalysis.Features" />
   </ItemGroup>
 
diff --git a/src/Parlance.Cli/Parlance.Cli.csproj b/src/Parlance.Cli/Parlance.Cli.csproj
index 74c5123..651efe2 100644
--- a/src/Parlance.Cli/Parlance.Cli.csproj
+++ b/src/Parlance.Cli/Parlance.Cli.csproj
@@ -14,9 +14,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.CommandLine" Version="2.0.3" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.0" />
+    <PackageReference Include="System.CommandLine" Version="2.0.11" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.11" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.11" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Parlance.Mcp/Parlance.Mcp.csproj b/src/Parlance.Mcp/Parlance.Mcp.csproj
index ff6f2e2..3dc4839 100644
--- a/src/Parlance.Mcp/Parlance.Mcp.csproj
+++ b/src/Parlance.Mcp/Parlance.Mcp.csproj
@@ -13,10 +13,12 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="ICSharpCode.Decompiler" Version="10.1.0.8386" />
-    <PackageReference Include="ModelContextProtocol" Version="1.1.0" />
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.0" />
+    <PackageReference Include="ICSharpCode.Decompiler" Version="10.1.1.8388" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="5.9.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.11" />
+    <PackageReference Include="ModelContextProtocol" Version="1.4.1" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.11" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.11" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/tests/Parlance.Abstractions.Tests/Parlance.Abstractions.Tests.csproj b/tests/Parlance.Abstractions.Tests/Parlance.Abstractions.Tests.csproj
index c3d8e3b..d0c2ec1 100644
--- a/tests/Parlance.Abstractions.Tests/Parlance.Abstractions.Tests.csproj
+++ b/tests/Parlance.Abstractions.Tests/Parlance.Abstractions.Tests.csproj
@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
diff --git a/tests/Parlance.Analysis.Tests/Parlance.Analysis.Tests.csproj b/tests/Parlance.Analysis.Tests/Parlance.Analysis.Tests.csproj
index c8c6bac..b20c0df 100644
--- a/tests/Parlance.Analysis.Tests/Parlance.Analysis.Tests.csproj
+++ b/tests/Parlance.Analysis.Tests/Parlance.Analysis.Tests.csproj
@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
@@ -28,7 +28,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="5.9.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.11" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/tests/Parlance.Analyzers.Upstream.Tests/Parlance.Analyzers.Upstream.Tests.csproj b/tests/Parlance.Analyzers.Upstream.Tests/Parlance.Analyzers.Upstream.Tests.csproj
index f648a66..eae37f2 100644
--- a/tests/Parlance.Analyzers.Upstream.Tests/Parlance.Analyzers.Upstream.Tests.csproj
+++ b/tests/Parlance.Analyzers.Upstream.Tests/Parlance.Analyzers.Upstream.Tests.csproj
@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Features" Version="$(RoslynVersion)" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
diff --git a/tests/Parlance.CSharp.Tests/Parlance.CSharp.Tests.csproj b/tests/Parlance.CSharp.Tests/Parlance.CSharp.Tests.csproj
index 5f07f3a..99eead5 100644
--- a/tests/Parlance.CSharp.Tests/Parlance.CSharp.Tests.csproj
+++ b/tests/Parlance.CSharp.Tests/Parlance.CSharp.Tests.csproj
@@ -12,7 +12,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing.XUnit" Version="1.1.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnit" Version="1.1.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(RoslynVersion)" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
diff --git a/tests/Parlance.CSharp.Workspace.Tests/Parlance.CSharp.Workspace.Tests.csproj b/tests/Parlance.CSharp.Workspace.Tests/Parlance.CSharp.Workspace.Tests.csproj
index 757acf9..17ed892 100644
--- a/tests/Parlance.CSharp.Workspace.Tests/Parlance.CSharp.Workspace.Tests.csproj
+++ b/tests/Parlance.CSharp.Workspace.Tests/Parlance.CSharp.Workspace.Tests.csproj
@@ -9,8 +9,8 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.11" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
@@ -33,7 +33,8 @@
     <NoWarn>$(NoWarn);CS0436</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Krafs.Publicizer" Version="2.3.0" PrivateAssets="all" />
+    <PackageReference Include="Krafs.Publicizer" Version="2.3.2" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="5.9.0" />
     <Publicize Include="Microsoft.CodeAnalysis.Features" />
   </ItemGroup>
 
diff --git a/tests/Parlance.Cli.Tests/Parlance.Cli.Tests.csproj b/tests/Parlance.Cli.Tests/Parlance.Cli.Tests.csproj
index 4eb8a17..63ef4db 100644
--- a/tests/Parlance.Cli.Tests/Parlance.Cli.Tests.csproj
+++ b/tests/Parlance.Cli.Tests/Parlance.Cli.Tests.csproj
@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
diff --git a/tests/Parlance.Mcp.Tests/Parlance.Mcp.Tests.csproj b/tests/Parlance.Mcp.Tests/Parlance.Mcp.Tests.csproj
index b6e815e..6eed059 100644
--- a/tests/Parlance.Mcp.Tests/Parlance.Mcp.Tests.csproj
+++ b/tests/Parlance.Mcp.Tests/Parlance.Mcp.Tests.csproj
@@ -9,8 +9,8 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
-    <PackageReference Include="ModelContextProtocol" Version="1.1.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
+    <PackageReference Include="ModelContextProtocol" Version="1.4.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
diff --git a/tests/Parlance.Package.Tests/Parlance.Package.Tests.csproj b/tests/Parlance.Package.Tests/Parlance.Package.Tests.csproj
index e88d229..fec530e 100644
--- a/tests/Parlance.Package.Tests/Parlance.Package.Tests.csproj
+++ b/tests/Parlance.Package.Tests/Parlance.Package.Tests.csproj
@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="10.0.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>
diff --git a/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj b/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj
index e8af603..2c16b15 100644
--- a/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj
+++ b/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj
@@ -9,8 +9,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="5.9.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.9.0" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>
diff --git a/tools/Parlance.ManifestGenerator/Parlance.ManifestGenerator.csproj b/tools/Parlance.ManifestGenerator/Parlance.ManifestGenerator.csproj
index 6004518..e2602f1 100644
--- a/tools/Parlance.ManifestGenerator/Parlance.ManifestGenerator.csproj
+++ b/tools/Parlance.ManifestGenerator/Parlance.ManifestGenerator.csproj
@@ -6,6 +6,7 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
   <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="5.9.0" />
     <ProjectReference Include="..\..\src\Parlance.Analyzers.Upstream\Parlance.Analyzers.Upstream.csproj" />
     <ProjectReference Include="..\..\src\Parlance.CSharp.Analyzers\Parlance.CSharp.Analyzers.csproj" />
   </ItemGroup>