diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 5afdf4fd9..ab9f9a750 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -2431,10 +2431,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WheelEventInit extends MouseEventInit {
     deltaMode?: number;
     deltaX?: number;
diff --git a/baselines/serviceworker.generated.d.ts b/baselines/serviceworker.generated.d.ts
index 9c8253d24..d03491c69 100644
--- a/baselines/serviceworker.generated.d.ts
+++ b/baselines/serviceworker.generated.d.ts
@@ -773,10 +773,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WriteParams {
     data?: BufferSource | Blob | string | null;
     position?: number | null;
diff --git a/baselines/sharedworker.generated.d.ts b/baselines/sharedworker.generated.d.ts
index 83a8d396a..80a7896f1 100644
--- a/baselines/sharedworker.generated.d.ts
+++ b/baselines/sharedworker.generated.d.ts
@@ -707,10 +707,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WorkerOptions {
     credentials?: RequestCredentials;
     name?: string;
diff --git a/baselines/ts5.5/dom.generated.d.ts b/baselines/ts5.5/dom.generated.d.ts
index d6c0536dd..2960c5748 100644
--- a/baselines/ts5.5/dom.generated.d.ts
+++ b/baselines/ts5.5/dom.generated.d.ts
@@ -2431,10 +2431,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WheelEventInit extends MouseEventInit {
     deltaMode?: number;
     deltaX?: number;
diff --git a/baselines/ts5.5/serviceworker.generated.d.ts b/baselines/ts5.5/serviceworker.generated.d.ts
index 9c8253d24..d03491c69 100644
--- a/baselines/ts5.5/serviceworker.generated.d.ts
+++ b/baselines/ts5.5/serviceworker.generated.d.ts
@@ -773,10 +773,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WriteParams {
     data?: BufferSource | Blob | string | null;
     position?: number | null;
diff --git a/baselines/ts5.5/sharedworker.generated.d.ts b/baselines/ts5.5/sharedworker.generated.d.ts
index 83a8d396a..80a7896f1 100644
--- a/baselines/ts5.5/sharedworker.generated.d.ts
+++ b/baselines/ts5.5/sharedworker.generated.d.ts
@@ -707,10 +707,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WorkerOptions {
     credentials?: RequestCredentials;
     name?: string;
diff --git a/baselines/ts5.5/webworker.generated.d.ts b/baselines/ts5.5/webworker.generated.d.ts
index cd34b4090..8b2139eb6 100644
--- a/baselines/ts5.5/webworker.generated.d.ts
+++ b/baselines/ts5.5/webworker.generated.d.ts
@@ -1009,10 +1009,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WorkerOptions {
     credentials?: RequestCredentials;
     name?: string;
diff --git a/baselines/webworker.generated.d.ts b/baselines/webworker.generated.d.ts
index cd34b4090..8b2139eb6 100644
--- a/baselines/webworker.generated.d.ts
+++ b/baselines/webworker.generated.d.ts
@@ -1009,10 +1009,13 @@ interface WebTransportOptions {
     serverCertificateHashes?: WebTransportHash[];
 }
 
-interface WebTransportSendStreamOptions {
+interface WebTransportSendOptions {
     sendOrder?: number;
 }
 
+interface WebTransportSendStreamOptions extends WebTransportSendOptions {
+}
+
 interface WorkerOptions {
     credentials?: RequestCredentials;
     name?: string;
diff --git a/inputfiles/overridingTypes.jsonc b/inputfiles/overridingTypes.jsonc
index 831c1d978..417cc458e 100644
--- a/inputfiles/overridingTypes.jsonc
+++ b/inputfiles/overridingTypes.jsonc
@@ -2073,6 +2073,16 @@
                     ]
                 }
             },
+            "WebTransportDatagramDuplexStream": {
+                "properties": {
+                    "property": {
+                        // WebTransportDatagramsWritable is not implemented by anyone as of 2025-03
+                        "writable": {
+                            "type": "WritableStream"
+                        }
+                    }
+                }
+            },
             "HTMLTableRowElement": {
                 "properties": {
                     "property": {
diff --git a/package-lock.json b/package-lock.json
index 872b0bb13..87c44660e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1184,9 +1184,9 @@
       "license": "MIT"
     },
     "node_modules/@webref/idl": {
-      "version": "3.61.0",
-      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.61.0.tgz",
-      "integrity": "sha512-X2mj++swgwl6Z57FMB/I1Q1Q9WnVa7iF0fZ6AFuehLgiFVbPLlTCJQG/zQrsWpXMyl2So8iJTjqx8OzQ1i+zfg==",
+      "version": "3.61.1",
+      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.61.1.tgz",
+      "integrity": "sha512-tvC6xQOJJ6ePSxKIM7u9S9kz5CvlisdDiyfwg6A+ATtuzbSH3j/DxO8du/i4Zu18u1cmYvi/NFrg2A5E8jIDuA==",
       "dev": true,
       "license": "MIT",
       "peerDependencies": {