diff --git a/extension/package-lock.json b/extension/package-lock.json
index 0ac632a4dc7..5403b8fe68d 100644
--- a/extension/package-lock.json
+++ b/extension/package-lock.json
@@ -39,7 +39,7 @@
         "gulp-filter": "7.0.0",
         "gulp-sourcemaps": "3.0.0",
         "gulp-typescript": "6.0.0-alpha.1",
-        "postcss": "8.5.8",
+        "postcss": "8.5.9",
         "sinon": "21.0.3",
         "ts-loader": "9.5.7",
         "ts-node": "10.9.2",
@@ -8877,9 +8877,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.8",
-      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/postcss/-/postcss-8.5.8.tgz",
-      "integrity": "sha1-YjDsyPsC56D2mC5TmQk3hX4T85k=",
+      "version": "8.5.9",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/postcss/-/postcss-8.5.9.tgz",
+      "integrity": "sha1-9u6eC5Tw8ZyX0vFyv71/xx/hzKQ=",
       "dev": true,
       "funding": [
         {
diff --git a/extension/package.json b/extension/package.json
index b807b70cd93..170892d4993 100644
--- a/extension/package.json
+++ b/extension/package.json
@@ -859,7 +859,7 @@
     "gulp-filter": "7.0.0",
     "gulp-sourcemaps": "3.0.0",
     "gulp-typescript": "6.0.0-alpha.1",
-    "postcss": "8.5.8",
+    "postcss": "8.5.9",
     "sinon": "21.0.3",
     "ts-loader": "9.5.7",
     "ts-node": "10.9.2",
diff --git a/extension/yarn.lock b/extension/yarn.lock
index 6f88f122065..9dc121fad60 100644
--- a/extension/yarn.lock
+++ b/extension/yarn.lock
@@ -4491,10 +4491,10 @@ pluralize@^8.0.0:
   resolved "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/pluralize/-/pluralize-8.0.0.tgz#1a6fa16a38d12a1901e0320fa017051c539ce3b1"
   integrity sha1-Gm+hajjRKhkB4DIPoBcFHFOc47E=
 
-postcss@8.5.8:
-  version "8.5.8"
-  resolved "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/postcss/-/postcss-8.5.8.tgz#6230ecc8fb02e7a0f6982e53990937857e13f399"
-  integrity sha1-YjDsyPsC56D2mC5TmQk3hX4T85k=
+postcss@8.5.9:
+  version "8.5.9"
+  resolved "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/postcss/-/postcss-8.5.9.tgz#f6ee9e0b94f0f19c97d2f172bfbd7fc71fe1cca4"
+  integrity sha1-9u6eC5Tw8ZyX0vFyv71/xx/hzKQ=
   dependencies:
     nanoid "^3.3.11"
     picocolors "^1.1.1"
diff --git a/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package-lock.json b/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package-lock.json
index edb7701e68a..7e1b6f03c0e 100644
--- a/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package-lock.json
+++ b/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package-lock.json
@@ -6,7 +6,7 @@
     "": {
       "name": "nextjs",
       "dependencies": {
-        "next": "15.5.14",
+        "next": "15.5.15",
         "react": "^19.0.0",
         "react-dom": "^19.0.0"
       },
@@ -493,127 +493,15 @@
       }
     },
     "node_modules/@next/env": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/env/-/env-15.5.14.tgz",
-      "integrity": "sha512-aXeirLYuASxEgi4X4WhfXsShCFxWDfNn/8ZeC5YXAS2BB4A8FJi1kwwGL6nvMVboE7fZCzmJPNdMvVHc8JpaiA==",
+      "version": "15.5.15",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/@next/env/-/env-15.5.15.tgz",
+      "integrity": "sha1-JLKblIUtpS3Y4Q8+oDgqPduHM6Y=",
       "license": "MIT"
     },
-    "node_modules/@next/swc-darwin-arm64": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-darwin-arm64/-/swc-darwin-arm64-15.5.14.tgz",
-      "integrity": "sha512-Y9K6SPzobnZvrRDPO2s0grgzC+Egf0CqfbdvYmQVaztV890zicw8Z8+4Vqw8oPck8r1TjUHxVh8299Cg4TrxXg==",
-      "cpu": [
-        "arm64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
-    "node_modules/@next/swc-darwin-x64": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-darwin-x64/-/swc-darwin-x64-15.5.14.tgz",
-      "integrity": "sha512-aNnkSMjSFRTOmkd7qoNI2/rETQm/vKD6c/Ac9BZGa9CtoOzy3c2njgz7LvebQJ8iPxdeTuGnAjagyis8a9ifBw==",
-      "cpu": [
-        "x64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
-    "node_modules/@next/swc-linux-arm64-gnu": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-gnu/-/swc-linux-arm64-gnu-15.5.14.tgz",
-      "integrity": "sha512-tjlpia+yStPRS//6sdmlVwuO1Rioern4u2onafa5n+h2hCS9MAvMXqpVbSrjgiEOoCs0nJy7oPOmWgtRRNSM5Q==",
-      "cpu": [
-        "arm64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
-    "node_modules/@next/swc-linux-arm64-musl": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-musl/-/swc-linux-arm64-musl-15.5.14.tgz",
-      "integrity": "sha512-8B8cngBaLadl5lbDRdxGCP1Lef8ipD6KlxS3v0ElDAGil6lafrAM3B258p1KJOglInCVFUjk751IXMr2ixeQOQ==",
-      "cpu": [
-        "arm64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
-    "node_modules/@next/swc-linux-x64-gnu": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-x64-gnu/-/swc-linux-x64-gnu-15.5.14.tgz",
-      "integrity": "sha512-bAS6tIAg8u4Gn3Nz7fCPpSoKAexEt2d5vn1mzokcqdqyov6ZJ6gu6GdF9l8ORFrBuRHgv3go/RfzYz5BkZ6YSQ==",
-      "cpu": [
-        "x64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
-    "node_modules/@next/swc-linux-x64-musl": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-x64-musl/-/swc-linux-x64-musl-15.5.14.tgz",
-      "integrity": "sha512-mMxv/FcrT7Gfaq4tsR22l17oKWXZmH/lVqcvjX0kfp5I0lKodHYLICKPoX1KRnnE+ci6oIUdriUhuA3rBCDiSw==",
-      "cpu": [
-        "x64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
-    "node_modules/@next/swc-win32-arm64-msvc": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-win32-arm64-msvc/-/swc-win32-arm64-msvc-15.5.14.tgz",
-      "integrity": "sha512-OTmiBlYThppnvnsqx0rBqjDRemlmIeZ8/o4zI7veaXoeO1PVHoyj2lfTfXTiiGjCyRDhA10y4h6ZvZvBiynr2g==",
-      "cpu": [
-        "arm64"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "win32"
-      ],
-      "engines": {
-        "node": ">= 10"
-      }
-    },
     "node_modules/@next/swc-win32-x64-msvc": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-win32-x64-msvc/-/swc-win32-x64-msvc-15.5.14.tgz",
-      "integrity": "sha512-+W7eFf3RS7m4G6tppVTOSyP9Y6FsJXfOuKzav1qKniiFm3KFByQfPEcouHdjlZmysl4zJGuGLQ/M9XyVeyeNEg==",
+      "version": "15.5.15",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/@next/swc-win32-x64-msvc/-/swc-win32-x64-msvc-15.5.15.tgz",
+      "integrity": "sha1-0q07lQbHYe0HKXrK6wD7LGlMQfg=",
       "cpu": [
         "x64"
       ],
@@ -717,12 +605,12 @@
       }
     },
     "node_modules/next": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/next/-/next-15.5.14.tgz",
-      "integrity": "sha512-M6S+4JyRjmKic2Ssm7jHUPkE6YUJ6lv4507jprsSZLulubz0ihO2E+S4zmQK3JZ2ov81JrugukKU4Tz0ivgqqQ==",
+      "version": "15.5.15",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public-npm/npm/registry/next/-/next-15.5.15.tgz",
+      "integrity": "sha1-slpZojK9mSqD2gRfoonugDwjyDY=",
       "license": "MIT",
       "dependencies": {
-        "@next/env": "15.5.14",
+        "@next/env": "15.5.15",
         "@swc/helpers": "0.5.15",
         "caniuse-lite": "^1.0.30001579",
         "postcss": "8.4.31",
@@ -735,14 +623,14 @@
         "node": "^18.18.0 || ^19.8.0 || >= 20.0.0"
       },
       "optionalDependencies": {
-        "@next/swc-darwin-arm64": "15.5.14",
-        "@next/swc-darwin-x64": "15.5.14",
-        "@next/swc-linux-arm64-gnu": "15.5.14",
-        "@next/swc-linux-arm64-musl": "15.5.14",
-        "@next/swc-linux-x64-gnu": "15.5.14",
-        "@next/swc-linux-x64-musl": "15.5.14",
-        "@next/swc-win32-arm64-msvc": "15.5.14",
-        "@next/swc-win32-x64-msvc": "15.5.14",
+        "@next/swc-darwin-arm64": "15.5.15",
+        "@next/swc-darwin-x64": "15.5.15",
+        "@next/swc-linux-arm64-gnu": "15.5.15",
+        "@next/swc-linux-arm64-musl": "15.5.15",
+        "@next/swc-linux-x64-gnu": "15.5.15",
+        "@next/swc-linux-x64-musl": "15.5.15",
+        "@next/swc-win32-arm64-msvc": "15.5.15",
+        "@next/swc-win32-x64-msvc": "15.5.15",
         "sharp": "^0.34.3"
       },
       "peerDependencies": {
@@ -768,6 +656,27 @@
         }
       }
     },
+    "node_modules/next/node_modules/@next/swc-darwin-arm64": {
+      "optional": true
+    },
+    "node_modules/next/node_modules/@next/swc-darwin-x64": {
+      "optional": true
+    },
+    "node_modules/next/node_modules/@next/swc-linux-arm64-gnu": {
+      "optional": true
+    },
+    "node_modules/next/node_modules/@next/swc-linux-arm64-musl": {
+      "optional": true
+    },
+    "node_modules/next/node_modules/@next/swc-linux-x64-gnu": {
+      "optional": true
+    },
+    "node_modules/next/node_modules/@next/swc-linux-x64-musl": {
+      "optional": true
+    },
+    "node_modules/next/node_modules/@next/swc-win32-arm64-msvc": {
+      "optional": true
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
diff --git a/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package.json b/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package.json
index a2bc9d240af..01001f24efd 100644
--- a/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package.json
+++ b/tests/Aspire.Cli.EndToEnd.Tests/Fixtures/JsPublish/nextjs/package.json
@@ -7,7 +7,7 @@
     "start": "next start"
   },
   "dependencies": {
-    "next": "15.5.14",
+    "next": "15.5.15",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },