diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4dd50c4c3..2a7d8303e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 - Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)
 
 # 2.147.x
+* Update Roslyn to 5.11.0-1.26379.2 (PR: [#9592](https://github.com/dotnet/vscode-csharp/pull/9592))
+  * Unsafe evolution: ensure diagnostics are picked up by IDE (PR: [#84603](https://github.com/dotnet/roslyn/pull/84603))
+  * Ensure we don't log errors when we are cancelling loading (PR: [#84622](https://github.com/dotnet/roslyn/pull/84622))
+  * Trim lsp dispatch allocations (PR: [#84651](https://github.com/dotnet/roslyn/pull/84651))
+  * Reduce LSP request handling allocations (PR: [#84623](https://github.com/dotnet/roslyn/pull/84623))
+  * Preserve line breaks after collapsed Razor blocks (PR: [#84630](https://github.com/dotnet/roslyn/pull/84630))
+  * Honour C# new line settings in Razor auto insert (PR: [#84632](https://github.com/dotnet/roslyn/pull/84632))
 * Update Roslyn to 5.10.0-1.26376.1 (PR: [#9584](https://github.com/dotnet/vscode-csharp/pull/9584))
   * Don't throw exceptions for nested, prefixed, tag helpers (PR: [#84611](https://github.com/dotnet/roslyn/pull/84611))
   * File-based apps: avoid running a few irrelevant editor features (PR: [#84575](https://github.com/dotnet/roslyn/pull/84575))
diff --git a/package-lock.json b/package-lock.json
index 8c179477d..b8192302b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,7 +43,7 @@
         "@typescript-eslint/eslint-plugin": "^8.19.0",
         "@typescript-eslint/parser": "^8.19.0",
         "@vscode/l10n-dev": "^0.0.35",
-        "@vscode/test-electron": "^2.5.2",
+        "@vscode/test-electron": "^3.1.0",
         "@vscode/vsce": "3.7.0",
         "esbuild": "^0.28.1",
         "eslint": "^8.43.0",
@@ -3475,9 +3475,9 @@
       }
     },
     "node_modules/@vscode/test-electron": {
-      "version": "2.5.2",
-      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/@vscode/test-electron/-/test-electron-2.5.2.tgz",
-      "integrity": "sha1-99QHjoIwzpyUMi8qKcwWwXlUCF0=",
+      "version": "3.1.0",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/@vscode/test-electron/-/test-electron-3.1.0.tgz",
+      "integrity": "sha1-Rrk9EY3NOzyJyq4pahP5p/XrY8U=",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -3488,7 +3488,7 @@
         "semver": "^7.6.2"
       },
       "engines": {
-        "node": ">=16"
+        "node": ">=22"
       }
     },
     "node_modules/@vscode/test-electron/node_modules/http-proxy-agent": {
@@ -15200,9 +15200,9 @@
       }
     },
     "@vscode/test-electron": {
-      "version": "2.5.2",
-      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/@vscode/test-electron/-/test-electron-2.5.2.tgz",
-      "integrity": "sha1-99QHjoIwzpyUMi8qKcwWwXlUCF0=",
+      "version": "3.1.0",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/@vscode/test-electron/-/test-electron-3.1.0.tgz",
+      "integrity": "sha1-Rrk9EY3NOzyJyq4pahP5p/XrY8U=",
       "dev": true,
       "requires": {
         "http-proxy-agent": "^7.0.2",
diff --git a/package.json b/package.json
index 259332cf1..e1f2c31f7 100644
--- a/package.json
+++ b/package.json
@@ -41,11 +41,11 @@
     "workspace"
   ],
   "defaults": {
-    "roslyn": "5.10.0-1.26376.1",
+    "roslyn": "5.11.0-1.26379.2",
     "omniSharp": "1.39.14",
     "razorOmnisharp": "7.0.0-preview.23363.1",
     "xamlTools": "18.10.12014.341",
-    "testDiscovery": "9.9.179-gc20357"
+    "testDiscovery": "9.9.223-ge3811b"
   },
   "main": "./dist/extension",
   "l10n": "./l10n",
@@ -143,7 +143,7 @@
     "@typescript-eslint/eslint-plugin": "^8.19.0",
     "@typescript-eslint/parser": "^8.19.0",
     "@vscode/l10n-dev": "^0.0.35",
-    "@vscode/test-electron": "^2.5.2",
+    "@vscode/test-electron": "^3.1.0",
     "@vscode/vsce": "3.7.0",
     "esbuild": "^0.28.1",
     "eslint": "^8.43.0",
@@ -5784,4 +5784,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}