diff --git a/eng/Packages.Data.props b/eng/Packages.Data.props
index 64f0a3d53b8f..f80f11bd68f9 100644
--- a/eng/Packages.Data.props
+++ b/eng/Packages.Data.props
@@ -226,7 +226,7 @@
     All should have PrivateAssets="All" set so they don't become package dependencies
   -->
   <ItemGroup>
-    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20240703.5" PrivateAssets="All" />
+    <PackageReference Update="Microsoft.Azure.AutoRest.CSharp" Version="3.0.0-beta.20240707.1" PrivateAssets="All" />
     <PackageReference Update="Azure.ClientSdk.Analyzers" Version="0.1.1-dev.20240429.1" PrivateAssets="All" />
     <PackageReference Update="coverlet.collector" Version="3.2.0" PrivateAssets="All" />
     <PackageReference Update="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0" PrivateAssets="All" />
diff --git a/eng/emitter-package-lock.json b/eng/emitter-package-lock.json
index 6f10f44f79d9..a071be113dd3 100644
--- a/eng/emitter-package-lock.json
+++ b/eng/emitter-package-lock.json
@@ -5,7 +5,7 @@
   "packages": {
     "": {
       "dependencies": {
-        "@azure-tools/typespec-csharp": "0.2.0-beta.20240703.5"
+        "@azure-tools/typespec-csharp": "0.2.0-beta.20240707.1"
       },
       "devDependencies": {
         "@azure-tools/typespec-autorest": "0.43.0",
@@ -22,9 +22,9 @@
       }
     },
     "node_modules/@autorest/csharp": {
-      "version": "3.0.0-beta.20240703.5",
-      "resolved": "https://registry.npmjs.org/@autorest/csharp/-/csharp-3.0.0-beta.20240703.5.tgz",
-      "integrity": "sha512-M5vJUlEUMerJhX+kI+bqB7suetxjScbBhIPKZLfRZwZTyrFfMn/zICvn2scTPByr3SK9ykvOPg3KpSBmcEI3oA=="
+      "version": "3.0.0-beta.20240707.1",
+      "resolved": "https://registry.npmjs.org/@autorest/csharp/-/csharp-3.0.0-beta.20240707.1.tgz",
+      "integrity": "sha512-MjvNBR5H1Yzg3NvsBswDkTj8WXT2rcYPyNIgG6apwgEqUni+HXIUFMgTYFzpoS4A7uTHo+saPH7j4IBYADkpiQ=="
     },
     "node_modules/@azure-tools/typespec-autorest": {
       "version": "0.43.0",
@@ -117,11 +117,11 @@
       }
     },
     "node_modules/@azure-tools/typespec-csharp": {
-      "version": "0.2.0-beta.20240703.5",
-      "resolved": "https://registry.npmjs.org/@azure-tools/typespec-csharp/-/typespec-csharp-0.2.0-beta.20240703.5.tgz",
-      "integrity": "sha512-ML5MtoH516AWFlvPyaLJ2QWVHhI70KbnCmZHef4e1G6Yr1VklXn7L9ZzCkMvqrkmGPadQBI5wfwJqySSgDfi7g==",
+      "version": "0.2.0-beta.20240707.1",
+      "resolved": "https://registry.npmjs.org/@azure-tools/typespec-csharp/-/typespec-csharp-0.2.0-beta.20240707.1.tgz",
+      "integrity": "sha512-jYm+W5pLlqeKIRoOPGRQLoEhK6SG8eG1qhrBS8QEV8s12GyngVx1qxChjviArKlCM3xfqX82zLOkrG8iJ5hh6w==",
       "dependencies": {
-        "@autorest/csharp": "3.0.0-beta.20240703.5",
+        "@autorest/csharp": "3.0.0-beta.20240707.1",
         "json-serialize-refs": "0.1.0-0"
       },
       "peerDependencies": {
diff --git a/eng/emitter-package.json b/eng/emitter-package.json
index 72735e1ea0bb..5005c065b59b 100644
--- a/eng/emitter-package.json
+++ b/eng/emitter-package.json
@@ -1,7 +1,7 @@
 {
   "main": "dist/src/index.js",
   "dependencies": {
-    "@azure-tools/typespec-csharp": "0.2.0-beta.20240703.5"
+    "@azure-tools/typespec-csharp": "0.2.0-beta.20240707.1"
   },
   "devDependencies": {
     "@azure-tools/typespec-autorest": "0.43.0",
diff --git a/sdk/communication/Azure.Communication.Messages/src/Generated/tspCodeModel.json b/sdk/communication/Azure.Communication.Messages/src/Generated/tspCodeModel.json
index ac4096b07757..fec6b442d448 100644
--- a/sdk/communication/Azure.Communication.Messages/src/Generated/tspCodeModel.json
+++ b/sdk/communication/Azure.Communication.Messages/src/Generated/tspCodeModel.json
@@ -1405,8 +1405,7 @@
         "$id": "189",
         "Type": {
          "$id": "190",
-         "Kind": "string",
-         "IsNullable": false
+         "Kind": "string"
         },
         "Value": "2024-02-01"
        },
@@ -1506,8 +1505,7 @@
        "NameInRequest": "Accept",
        "Type": {
         "$id": "200",
-        "Kind": "string",
-        "IsNullable": false
+        "Kind": "string"
        },
        "Location": "Header",
        "IsApiVersion": false,
@@ -1532,8 +1530,7 @@
        "NameInRequest": "Content-Type",
        "Type": {
         "$id": "203",
-        "Kind": "string",
-        "IsNullable": false
+        "Kind": "string"
        },
        "Location": "Header",
        "IsApiVersion": false,
@@ -1679,8 +1676,7 @@
        "NameInRequest": "Accept",
        "Type": {
         "$id": "217",
-        "Kind": "string",
-        "IsNullable": false
+        "Kind": "string"
        },
        "Location": "Header",
        "IsApiVersion": false,
@@ -1851,8 +1847,7 @@
        "NameInRequest": "Accept",
        "Type": {
         "$id": "235",
-        "Kind": "string",
-        "IsNullable": false
+        "Kind": "string"
        },
        "Location": "Header",
        "IsApiVersion": false,