diff --git a/eng/Packages.Data.props b/eng/Packages.Data.props
index 7822a3fb2040..f3e3c7b0400c 100644
--- a/eng/Packages.Data.props
+++ b/eng/Packages.Data.props
@@ -466,7 +466,7 @@
 
   <PropertyGroup>
     <TestProxyVersion>1.0.0-dev.20250805.1</TestProxyVersion>
-    <UnbrandedGeneratorVersion>1.0.0-alpha.20250918.1</UnbrandedGeneratorVersion>
+    <UnbrandedGeneratorVersion>1.0.0-alpha.20250922.1</UnbrandedGeneratorVersion>
     <AzureGeneratorVersion>1.0.0-alpha.20250903.2</AzureGeneratorVersion>
   </PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/eng/http-client-csharp-emitter-package-lock.json b/eng/http-client-csharp-emitter-package-lock.json
index cac28dd2aedf..9d850d3f29d7 100644
--- a/eng/http-client-csharp-emitter-package-lock.json
+++ b/eng/http-client-csharp-emitter-package-lock.json
@@ -5,7 +5,7 @@
   "packages": {
     "": {
       "dependencies": {
-        "@typespec/http-client-csharp": "1.0.0-alpha.20250918.1",
+        "@typespec/http-client-csharp": "1.0.0-alpha.20250922.1",
         "client-plugin": "file:../../../../eng/packages/plugins/client"
       },
       "devDependencies": {
@@ -601,9 +601,9 @@
       }
     },
     "node_modules/@typespec/http-client-csharp": {
-      "version": "1.0.0-alpha.20250918.1",
-      "resolved": "https://registry.npmjs.org/@typespec/http-client-csharp/-/http-client-csharp-1.0.0-alpha.20250918.1.tgz",
-      "integrity": "sha512-Yy5FOOjC6XgQdHO3f1iIMby8yRjE93i6ZeALfyq7PgCNee2Kf7ucmzfkZaM4QgiiGLba1ibCqO1nbn99zeb04Q==",
+      "version": "1.0.0-alpha.20250922.1",
+      "resolved": "https://registry.npmjs.org/@typespec/http-client-csharp/-/http-client-csharp-1.0.0-alpha.20250922.1.tgz",
+      "integrity": "sha512-9h2D6/BM3crpX/redDlH8ZSOBvoiCUAjAy1BcBTHto0sxfswQMW8htVdgYVnfb7q14RaaoM43B8svQH+QHuEOQ==",
       "license": "MIT",
       "peerDependencies": {
         "@azure-tools/typespec-client-generator-core": ">=0.60.0 < 0.61.0 || ~0.61.0-0",
@@ -1150,9 +1150,9 @@
       }
     },
     "node_modules/minizlib": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-3.0.2.tgz",
-      "integrity": "sha512-oG62iEk+CYt5Xj2YqI5Xi9xWUeZhDI8jjQmC5oThVH5JGCTgIjr7ciJDzC7MBzYd//WvR1OTmP5Q38Q8ShQtVA==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-3.1.0.tgz",
+      "integrity": "sha512-KZxYo1BUkWD2TVFLr0MQoM8vUUigWD3LlD83a/75BqC+4qE0Hb1Vo5v1FgcfaNXvfXzr+5EhQ6ing/CaBijTlw==",
       "license": "MIT",
       "dependencies": {
         "minipass": "^7.1.2"
@@ -1161,21 +1161,6 @@
         "node": ">= 18"
       }
     },
-    "node_modules/mkdirp": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-3.0.1.tgz",
-      "integrity": "sha512-+NsyUUAZDmo6YVHzL/stxSu3t9YS1iljliy3BSDrXJ/dkn1KYdmtZODGGjLcc9XLgVVpH4KshHB8XmZgMhaBXg==",
-      "license": "MIT",
-      "bin": {
-        "mkdirp": "dist/cjs/src/bin.js"
-      },
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "node_modules/mustache": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/mustache/-/mustache-4.2.0.tgz",
@@ -1379,16 +1364,15 @@
       }
     },
     "node_modules/tar": {
-      "version": "7.4.3",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-7.4.3.tgz",
-      "integrity": "sha512-5S7Va8hKfV7W5U6g3aYxXmlPoZVAwUMy9AOKyF2fVuZa2UD3qZjg578OrLRt8PcNN1PleVaL/5/yYATNL0ICUw==",
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-7.4.4.tgz",
+      "integrity": "sha512-O1z7ajPkjTgEgmTGz0v9X4eqeEXTDREPTO77pVC1Nbs86feBU1Zhdg+edzavPmYW1olxkwsqA2v4uOw6E8LeDg==",
       "license": "ISC",
       "dependencies": {
         "@isaacs/fs-minipass": "^4.0.0",
         "chownr": "^3.0.0",
         "minipass": "^7.1.2",
-        "minizlib": "^3.0.1",
-        "mkdirp": "^3.0.1",
+        "minizlib": "^3.1.0",
         "yallist": "^5.0.0"
       },
       "engines": {
diff --git a/eng/http-client-csharp-emitter-package.json b/eng/http-client-csharp-emitter-package.json
index dc49fb812027..ba507504292e 100644
--- a/eng/http-client-csharp-emitter-package.json
+++ b/eng/http-client-csharp-emitter-package.json
@@ -2,7 +2,7 @@
   "main": "dist/src/index.js",
   "dependencies": {
     "client-plugin": "file:../../../../eng/packages/plugins/client",
-    "@typespec/http-client-csharp": "1.0.0-alpha.20250918.1"
+    "@typespec/http-client-csharp": "1.0.0-alpha.20250922.1"
   },
   "devDependencies": {
     "@azure-tools/typespec-client-generator-core": "0.60.0",
diff --git a/eng/packages/http-client-csharp/package-lock.json b/eng/packages/http-client-csharp/package-lock.json
index 2d4521e44b3c..049a20db7a8e 100644
--- a/eng/packages/http-client-csharp/package-lock.json
+++ b/eng/packages/http-client-csharp/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
-        "@typespec/http-client-csharp": "1.0.0-alpha.20250918.1"
+        "@typespec/http-client-csharp": "1.0.0-alpha.20250922.1"
       },
       "devDependencies": {
         "@azure-tools/azure-http-specs": "0.1.0-alpha.28",
@@ -2764,9 +2764,9 @@
       }
     },
     "node_modules/@typespec/http-client-csharp": {
-      "version": "1.0.0-alpha.20250918.1",
-      "resolved": "https://registry.npmjs.org/@typespec/http-client-csharp/-/http-client-csharp-1.0.0-alpha.20250918.1.tgz",
-      "integrity": "sha512-Yy5FOOjC6XgQdHO3f1iIMby8yRjE93i6ZeALfyq7PgCNee2Kf7ucmzfkZaM4QgiiGLba1ibCqO1nbn99zeb04Q==",
+      "version": "1.0.0-alpha.20250922.1",
+      "resolved": "https://registry.npmjs.org/@typespec/http-client-csharp/-/http-client-csharp-1.0.0-alpha.20250922.1.tgz",
+      "integrity": "sha512-9h2D6/BM3crpX/redDlH8ZSOBvoiCUAjAy1BcBTHto0sxfswQMW8htVdgYVnfb7q14RaaoM43B8svQH+QHuEOQ==",
       "license": "MIT",
       "peerDependencies": {
         "@azure-tools/typespec-client-generator-core": ">=0.60.0 < 0.61.0 || ~0.61.0-0",
diff --git a/eng/packages/http-client-csharp/package.json b/eng/packages/http-client-csharp/package.json
index 4cf7d28c7836..85d94a59322e 100644
--- a/eng/packages/http-client-csharp/package.json
+++ b/eng/packages/http-client-csharp/package.json
@@ -38,7 +38,7 @@
     "dist/generator/**"
   ],
   "dependencies": {
-    "@typespec/http-client-csharp": "1.0.0-alpha.20250918.1"
+    "@typespec/http-client-csharp": "1.0.0-alpha.20250922.1"
   },
   "devDependencies": {
     "@azure-tools/azure-http-specs": "0.1.0-alpha.28",