diff --git a/CHANGELOG.md b/CHANGELOG.md
index e994671f59..e43099392e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,23 @@
 * Bump tar-fs from 2.1.3 to 2.1.4 (PR: [#8661](https://github.com/dotnet/vscode-csharp/pull/8661))
 * Add copilot setup steps (PR: [#8655](https://github.com/dotnet/vscode-csharp/pull/8655))
 * Update pipeline and packaging excludes (PR: [#8654](https://github.com/dotnet/vscode-csharp/pull/8654))
+* Add new telemetry fields (PR: [#8673](https://github.com/dotnet/vscode-csharp/pull/8673))
+* Bump Roslyn to 5.1.0-1.25506.3 (PR: [#8673](https://github.com/dotnet/vscode-csharp/pull/8673))
+  * Improve error recovery when object initializer uses ':' instead of '=' (PR: [#80553](https://github.com/dotnet/roslyn/pull/80553))
+  * Support `field` keyword in EE. (PR: [#80515](https://github.com/dotnet/roslyn/pull/80515))
+  * Log a debug message for ContentModified exceptions. (PR: [#80549](https://github.com/dotnet/roslyn/pull/80549))
+  * Update proposal adjuster to acquire feature flags from VS (PR: [#80541](https://github.com/dotnet/roslyn/pull/80541))
+  * Add telemetry indicating when file-based programs are used (PR: [#80538](https://github.com/dotnet/roslyn/pull/80538))
+  * Fix thread safety issue in BuildServerConnection.TryCreateServer environment variable handling (PR: [#80498](https://github.com/dotnet/roslyn/pull/80498))
+  * Extensions: refine tracking of used imports (PR: [#80485](https://github.com/dotnet/roslyn/pull/80485))
+  * Disambiguate extension methods in "ambiguous call" error message when they have the same name but are from different assemblies (PR: [#80453](https://github.com/dotnet/roslyn/pull/80453))
+  * Block file-local EmbeddedAttribute definitions. (PR: [#80501](https://github.com/dotnet/roslyn/pull/80501))
+  * Extension block members do not have `this` parameter (PR: [#80457](https://github.com/dotnet/roslyn/pull/80457))
+  * Handle some scenarios where attributes applied in local functions or lambdas within extension blocks were missing in metadata (PR: [#80464](https://github.com/dotnet/roslyn/pull/80464))
+  * Unset other DOTNET_ROOT env vars when launching apphosts (PR: [#80492](https://github.com/dotnet/roslyn/pull/80492))
+  * Add friendlier error message on an explicit implementation when the return type is wrong (PR: [#8037](https://github.com/dotnet/roslyn/pull/80376)
+  * Extensions: add Name property on embedded ExtensionMarkerAttribute (PR: [#80456](https://github.com/dotnet/roslyn/pull/80456))
+  * Avoid implicit null checks while narrowing type for `or` patterns (PR: [#80348](https://github.com/dotnet/roslyn/pull/80348))
 
 # 2.93.x
 * Bump Roslyn to 5.0.0-2.25472.11 (PR: [#8646](https://github.com/dotnet/vscode-csharp/pull/8646))
diff --git a/package.json b/package.json
index c54eaf1a96..501e0d28c6 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "workspace"
   ],
   "defaults": {
-    "roslyn": "5.1.0-1.25475.3",
+    "roslyn": "5.1.0-1.25506.3",
     "omniSharp": "1.39.14",
     "razor": "10.0.0-preview.25472.6",
     "razorOmnisharp": "7.0.0-preview.23363.1",
diff --git a/src/shared/projectConfiguration.ts b/src/shared/projectConfiguration.ts
index 8e5bb01335..e774cc24bb 100644
--- a/src/shared/projectConfiguration.ts
+++ b/src/shared/projectConfiguration.ts
@@ -19,6 +19,9 @@ export interface ProjectConfigurationMessage {
     FileExtensions: string[];
     FileCounts: number[];
     SdkStyleProject: boolean;
+    HasSolutionFile?: boolean;
+    IsFileBasedProgram?: boolean;
+    IsMiscellaneousFile?: boolean;
 }
 
 export function reportProjectConfigurationEvent(
@@ -47,6 +50,18 @@ export function reportProjectConfigurationEvent(
     telemetryProps['NetSdkVersion'] = dotnetInfo?.Version ?? '';
     telemetryProps['sdkStyleProject'] = projectConfig.SdkStyleProject.toString();
 
+    if (projectConfig.HasSolutionFile != null) {
+        telemetryProps['HasSolutionFile'] = projectConfig.HasSolutionFile.toString();
+    }
+
+    if (projectConfig.IsFileBasedProgram != null) {
+        telemetryProps['IsFileBasedProgram'] = projectConfig.IsFileBasedProgram.toString();
+    }
+
+    if (projectConfig.IsMiscellaneousFile != null) {
+        telemetryProps['IsMiscellaneousFile'] = projectConfig.IsMiscellaneousFile.toString();
+    }
+
     if (useModernNet) {
         telemetryProps['useModernNet'] = useModernNet.toString();
     }
diff --git a/test/omnisharp/omnisharpUnitTests/logging/telemetryObserver.test.ts b/test/omnisharp/omnisharpUnitTests/logging/telemetryObserver.test.ts
index 0110c87f9a..26b4bf3728 100644
--- a/test/omnisharp/omnisharpUnitTests/logging/telemetryObserver.test.ts
+++ b/test/omnisharp/omnisharpUnitTests/logging/telemetryObserver.test.ts
@@ -100,6 +100,9 @@ describe('TelemetryReporterObserver', () => {
             FileExtensions: fileExtensions,
             FileCounts: fileCounts,
             SdkStyleProject: sdkStyleProject,
+            HasSolutionFile: true,
+            IsFileBasedProgram: true,
+            IsMiscellaneousFile: true,
         });
 
         await observer.post(event);
@@ -114,6 +117,9 @@ describe('TelemetryReporterObserver', () => {
         expect(property['FileCounts']).toEqual('7|3');
         expect(property['useModernNet']).toEqual('true');
         expect(property['sdkStyleProject']).toEqual('true');
+        expect(property['HasSolutionFile']).toEqual('true');
+        expect(property['IsFileBasedProgram']).toEqual('true');
+        expect(property['IsMiscellaneousFile']).toEqual('true');
     });
 
     [