diff --git a/app/Build/Build Script.csproj b/app/Build/Build Script.csproj
index a03729968..f38eb49c9 100644
--- a/app/Build/Build Script.csproj	
+++ b/app/Build/Build Script.csproj	
@@ -14,7 +14,7 @@
       <PackageReference Include="Cocona" Version="2.2.0" />
 
       <!-- Pins Cocona's transitive Microsoft.Extensions.Hosting 6.0.0, which pulled in the vulnerable System.Text.Json 6.0.0 (GHSA-8g4q-xg66-9fp4) -->
-      <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.21" />
+      <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.22" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/app/MindWork AI Studio/MindWork AI Studio.csproj b/app/MindWork AI Studio/MindWork AI Studio.csproj
index 5ee4093a1..497dd8681 100644
--- a/app/MindWork AI Studio/MindWork AI Studio.csproj	
+++ b/app/MindWork AI Studio/MindWork AI Studio.csproj	
@@ -7,7 +7,7 @@
         <Authors>Thorsten Sommer</Authors>
         <TargetFramework>net9.0</TargetFramework>
         <Nullable>enable</Nullable>
-        <WarningsAsErrors>CS8600;CS8602;CS8603</WarningsAsErrors>
+        <WarningsAsErrors>CS8600;CS8602;CS8603;CS9057</WarningsAsErrors> <!-- CS9057: fail instead of silently skipping an analyzer which needs a newer compiler than the SDK's -->
         <ImplicitUsings>enable</ImplicitUsings>
         <RootNamespace>AIStudio</RootNamespace>
         <AssemblyName>mindworkAIStudio</AssemblyName>
@@ -73,15 +73,15 @@
       <PackageReference Include="CodeBeam.MudBlazor.Extensions" Version="8.3.0" />
       <PackageReference Include="DocumentFormat.OpenXml" Version="3.5.1" />
       <PackageReference Include="HtmlAgilityPack" Version="1.12.4" />
-      <PackageReference Include="MailKit" Version="4.18.1" />
-      <PackageReference Include="Microsoft.Data.Sqlite.Core" Version="9.0.21" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.21" />
-      <PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="9.0.21" />
+      <PackageReference Include="MailKit" Version="4.18.2" />
+      <PackageReference Include="Microsoft.Data.Sqlite.Core" Version="9.0.22" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.22" />
+      <PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="9.0.22" />
       <PackageReference Include="MudBlazor" Version="8.15.0" />
       <PackageReference Include="MudBlazor.Markdown" Version="8.11.0" />
       <PackageReference Include="ReverseMarkdown" Version="5.0.0" />
       <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="3.0.5" />
-      <PackageReference Include="LuaCSharp" Version="0.5.7" />
+      <PackageReference Include="LuaCSharp" Version="0.5.8" />
 
       <!--
           Not used by AI Studio directly: MailKit pulls it in through MimeKit, which asks for 10.0.0. That
diff --git a/app/MindWork AI Studio/packages.lock.json b/app/MindWork AI Studio/packages.lock.json
index 26970bc43..387f39f59 100644
--- a/app/MindWork AI Studio/packages.lock.json	
+++ b/app/MindWork AI Studio/packages.lock.json	
@@ -31,63 +31,63 @@
       },
       "LuaCSharp": {
         "type": "Direct",
-        "requested": "[0.5.7, )",
-        "resolved": "0.5.7",
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+        "requested": "[0.5.8, )",
+        "resolved": "0.5.8",
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         "dependencies": {
-          "LuaCSharp.Annotations": "0.5.7",
-          "LuaCSharp.SourceGenerator": "0.5.7"
+          "LuaCSharp.Annotations": "0.5.8",
+          "LuaCSharp.SourceGenerator": "0.5.8"
         }
       },
       "MailKit": {
         "type": "Direct",
-        "requested": "[4.18.1, )",
-        "resolved": "4.18.1",
-        "contentHash": "EssBsnKHvIcH1QpqqsVUEWAlAHI3dkGXJpKAzSNJ8PGjClNynSo9bRkT68jVZkxhREm0Z51Dwu3127f4WfIiRg==",
+        "requested": "[4.18.2, )",
+        "resolved": "4.18.2",
+        "contentHash": "ofqddpSbdrD00NqTD0ZyVfKvrl/ZZ70VFFEQ+DuR8r8CdbY3U02/sdb0CSQBNUqJifsXfVHIwRe1ToR2MvJJkw==",
         "dependencies": {
-          "MimeKit": "4.18.1",
-          "System.Formats.Asn1": "10.0.0"
+          "MimeKit": "4.18.2",
+          "System.Formats.Asn1": "10.0.13"
         }
       },
       "Microsoft.Data.Sqlite.Core": {
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         "dependencies": {
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         }
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       "Microsoft.EntityFrameworkCore.Sqlite": {
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-          "Microsoft.Extensions.Configuration.Abstractions": "9.0.21",
-          "Microsoft.Extensions.DependencyModel": "9.0.21",
-          "Microsoft.Extensions.Logging": "9.0.21",
+          "Microsoft.EntityFrameworkCore.Sqlite.Core": "9.0.22",
+          "Microsoft.Extensions.Caching.Memory": "9.0.22",
+          "Microsoft.Extensions.Configuration.Abstractions": "9.0.22",
+          "Microsoft.Extensions.DependencyModel": "9.0.22",
+          "Microsoft.Extensions.Logging": "9.0.22",
           "SQLitePCLRaw.bundle_e_sqlite3": "2.1.13",
           "SQLitePCLRaw.core": "2.1.13",
-          "System.Text.Json": "9.0.21"
+          "System.Text.Json": "9.0.22"
         }
       },
       "Microsoft.Extensions.FileProviders.Embedded": {
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-        "requested": "[9.0.21, )",
-        "resolved": "9.0.21",
-        "contentHash": "l+daceqd/hww6K0bER5Rq+flof3aMTmtW9wgDi1jHou+rQLb8bBX74PyaGfnXo1eKaxROmM5jbiLoQ1cgyxaEw==",
+        "requested": "[9.0.22, )",
+        "resolved": "9.0.22",
+        "contentHash": "8pjPIPzG5OGIBG65TSUExMZeMeFpCDVJPtNzYtcJyNPCqgOI/skfKq5ZEca1VmswL2CQ7oxEYiCFNO2LhAJ4uA==",
         "dependencies": {
-          "Microsoft.Extensions.FileProviders.Abstractions": "9.0.21"
+          "Microsoft.Extensions.FileProviders.Abstractions": "9.0.22"
         }
       },
       "Microsoft.NET.ILLink.Tasks": {
         "type": "Direct",
-        "requested": "[9.0.21, )",
-        "resolved": "9.0.21",
-        "contentHash": "ryionTSVk0ZU5/gW6r6Kh6LxvUzuF8HIcO0CLHoHhn7ZHZLbpGGYSe3duYzaNTtZK/AOQfqtYLUEW5LfbhSw3w=="
+        "requested": "[9.0.22, )",
+        "resolved": "9.0.22",
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       },
       "MudBlazor": {
         "type": "Direct",
@@ -159,13 +159,13 @@
       },
       "LuaCSharp.Annotations": {
         "type": "Transitive",
-        "resolved": "0.5.7",
-        "contentHash": "564xGuNTWHcOTPuml/ST6MDw4v5ju+c//R4OmXlmmcOBS/mGE7h9JaLeLblulF78ZqSiq3q+mi0ImHRLdSSIRQ=="
+        "resolved": "0.5.8",
+        "contentHash": "aRPtU/pDzXg0ZoN/Dq4+sEN5X+uzn5CH7POdt8/K3pZJYvK+IHTXd/byr+AfSmZliiZoZrDEb316OHxBB5SRVQ=="
       },
       "LuaCSharp.SourceGenerator": {
         "type": "Transitive",
-        "resolved": "0.5.7",
-        "contentHash": "uaD/gfASJrt0jDGXaryeGAXoCaUBBoEF7AGxJ9H0tFfkKEAeU5RjBolyym7Hq0tKgn86WLmbXf+dd8JfyDpmfQ=="
+        "resolved": "0.5.8",
+        "contentHash": "DT6RetfrtESoXf8K+AKAbqpTxpEgtDYsju+SdpFWRaeoGE8NpZZgqnSDplTBtlI62XpZB8a9+AVT/GrorYxk4Q=="
       },
       "Markdig": {
         "type": "Transitive",
@@ -228,103 +228,103 @@
       },
       "Microsoft.EntityFrameworkCore": {
         "type": "Transitive",
-        "resolved": "9.0.21",
-        "contentHash": "wegRGNmcRUBc5IbSZo6BpcpdOYelvIDBO+78ykXl7RE+5oCGGaIRE+qbRDnrXn/K3iFcUFcg9PyHz7rpD4yI4A==",
+        "resolved": "9.0.22",
+        "contentHash": "wBYt52v8cQ5abaA8jR3m+LPV8N3ymhz0pTPMvwYck9VZ9ItcYIu130qEYdsinMNt9co+4n7SMZdI1dFjJHIvNQ==",
         "dependencies": {
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-          "Microsoft.EntityFrameworkCore.Analyzers": "9.0.21",
-          "Microsoft.Extensions.Caching.Memory": "9.0.21",
-          "Microsoft.Extensions.Logging": "9.0.21"
+          "Microsoft.EntityFrameworkCore.Abstractions": "9.0.22",
+          "Microsoft.EntityFrameworkCore.Analyzers": "9.0.22",
+          "Microsoft.Extensions.Caching.Memory": "9.0.22",
+          "Microsoft.Extensions.Logging": "9.0.22"
         }
       },
       "Microsoft.EntityFrameworkCore.Abstractions": {
         "type": "Transitive",
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       },
       "Microsoft.EntityFrameworkCore.Analyzers": {
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-        "contentHash": "5k05vM84ipVL/bBMUo05zjRIbp3pY4RMmMflXW3wmQhCtuEsOHLgX36zA4XPrdjAhSjk4QqqPuVTlo4WbJeVGg=="
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       },
       "Microsoft.EntityFrameworkCore.Relational": {
         "type": "Transitive",
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-        "contentHash": "an6YjYP8I2/24pNbKTssh9S6P2K+v7iVNRAjR++sx0U358+SGEGCE+qmomP7LZD1f5iXZO6Tf3SNUZxLpeZakA==",
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-          "Microsoft.Extensions.Caching.Memory": "9.0.21",
-          "Microsoft.Extensions.Configuration.Abstractions": "9.0.21",
-          "Microsoft.Extensions.Logging": "9.0.21"
+          "Microsoft.EntityFrameworkCore": "9.0.22",
+          "Microsoft.Extensions.Caching.Memory": "9.0.22",
+          "Microsoft.Extensions.Configuration.Abstractions": "9.0.22",
+          "Microsoft.Extensions.Logging": "9.0.22"
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-          "Microsoft.Extensions.Configuration.Abstractions": "9.0.21",
-          "Microsoft.Extensions.DependencyModel": "9.0.21",
-          "Microsoft.Extensions.Logging": "9.0.21",
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+          "Microsoft.Extensions.Logging": "9.0.22",
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-          "System.Text.Json": "9.0.21"
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-          "Microsoft.Extensions.Options": "9.0.21",
-          "Microsoft.Extensions.Primitives": "9.0.21"
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-          "Microsoft.Extensions.Primitives": "9.0.21"
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       "Microsoft.Extensions.Localization": {
@@ -345,35 +345,35 @@
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-        "contentHash": "WBOg9sKnfnfFfjo+w5Osk73BMFabRHxpbDefxgK16KGLbrLljUCaRPsHfOHpTpM7bcIbkRJKBtWypHQOewy1tw=="
+        "resolved": "9.0.22",
+        "contentHash": "sna268GZylvTK/y/HJgjs1fqKBDG3Yj4nsCQQNiIhKKITlvcFbEaf65FTC754VXHu1PE1HoDvXblRwi7LU8CGw=="
       },
       "Microsoft.JSInterop": {
         "type": "Transitive",
@@ -382,11 +382,11 @@
       },
       "MimeKit": {
         "type": "Transitive",
-        "resolved": "4.18.1",
-        "contentHash": "D8AfFVMFVJldWmhQWCziC9nWUN/zayFFBAKpyjVyCeh0tqBiI9jtUVuMrKgWw1EGnCp09msDZldbRvp2jfUehQ==",
+        "resolved": "4.18.2",
+        "contentHash": "aYnwCCq+ZgQIsnHSJd3TMeGqf/Rz/9jYEItXpOoG3E2REOCZtLishwBSDFl2wQ/W2SB5wBsvE38DgHZ0IEyz4Q==",
         "dependencies": {
           "BouncyCastle.Cryptography": "2.7.0",
-          "System.Security.Cryptography.Pkcs": "10.0.0"
+          "System.Security.Cryptography.Pkcs": "10.0.13"
         }
       },
       "SQLite": {
@@ -427,8 +427,8 @@
       },
       "System.Text.Json": {
         "type": "Transitive",
-        "resolved": "9.0.21",
-        "contentHash": "VrYLYCFG9bkv2fW2JrZI5OKjDSthyuJb72xFH4FgkYNZ2llcBo+4UqQk0TzT0KEuKvtjWd9a0xKHgPhsu7CE6w=="
+        "resolved": "9.0.22",
+        "contentHash": "bP1LqWP1h1/J/XO69m5kdLF7M1HT6YWpM7UflcIKLLTvJep8HoS6I/F8FnV/uGhqmStLHY8PuiQAmjQg+qqqcg=="
       },
       "sharedtools": {
         "type": "Project"
diff --git a/app/MindWork AI Studio/wwwroot/changelog/v26.10.1.md b/app/MindWork AI Studio/wwwroot/changelog/v26.10.1.md
index 14dc3f9c5..21b15560a 100644
--- a/app/MindWork AI Studio/wwwroot/changelog/v26.10.1.md	
+++ b/app/MindWork AI Studio/wwwroot/changelog/v26.10.1.md	
@@ -159,4 +159,4 @@
 - Updated the code contributions on the supporters page, which now thank everyone who has contributed code to AI Studio so far.
 - Upgraded several libraries to improve security.
 - Upgraded to Rust v1.99.1
-- Upgraded to .NET 9.0.21
\ No newline at end of file
+- Upgraded to .NET 9.0.22
\ No newline at end of file
diff --git a/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj b/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj
index 8cf49a2ae..0a0944c81 100644
--- a/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj
+++ b/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj
@@ -19,6 +19,12 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
+        <!--
+            Never above the Roslyn of the .NET SDK we build with (see metadata.txt): the 9.0.1xx SDKs ship
+            Roslyn 4.12. Built against a newer one, the compiler skips these analyzers with CS9057. Raise
+            both only together with the SDK feature band, with SourceGeneratedMappings, and with the Tests
+            project.
+        -->
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
     </ItemGroup>
diff --git a/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj b/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj
index 9bc8e18aa..d85c4bcfe 100644
--- a/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj
+++ b/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj
@@ -20,6 +20,12 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
+        <!--
+            Never above the Roslyn of the .NET SDK we build with (see metadata.txt): the 9.0.1xx SDKs ship
+            Roslyn 4.12. Built against a newer one, the compiler skips this generator with CS9057, and the
+            generated namespaces such as AIStudio.Tools.PluginSystem.Assistants.Icons go missing. Raise it
+            only together with the SDK feature band, with SourceCodeRules, and with the Tests project.
+        -->
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
     </ItemGroup>
 </Project>
diff --git a/app/Tests/Tests.csproj b/app/Tests/Tests.csproj
index be8a65f60..87681ae71 100644
--- a/app/Tests/Tests.csproj
+++ b/app/Tests/Tests.csproj
@@ -14,7 +14,7 @@
         <!--
             Held at the version the two analyzer projects build against, so that a test compiling a
             snippet uses the same Roslyn the analyzers themselves were written for. Raise all three
-            together.
+            together, and never above the Roslyn of the .NET SDK in metadata.txt (4.12 for 9.0.1xx).
         -->
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.0" />
diff --git a/metadata.txt b/metadata.txt
index e7f4409de..31c1b89ca 100644
--- a/metadata.txt
+++ b/metadata.txt
@@ -1,8 +1,8 @@
 26.9.1
 2026-09-28 18:24:50 UTC
 257
-9.0.122 (commit 17951ad7c6)
-9.0.21 (commit d280e4fb38)
+9.0.123 (commit b66a5cb678)
+9.0.22 (commit faaecba82d)
 1.99.1 (commit 58cf8f9c3)
 8.15.0
 2.11.5