diff --git a/custom/idl/speech-api.idl b/custom/idl/speech-api.idl
index af824da5..17305e3c 100644
--- a/custom/idl/speech-api.idl
+++ b/custom/idl/speech-api.idl
@@ -2,29 +2,3 @@ partial interface SpeechRecognitionEvent {
   readonly attribute USVString emma;
   readonly attribute DOMString interpretation;
 };
-
-// https://github.com/WebAudio/web-speech-api/pull/117
-
-partial interface SpeechRecognition {
-  attribute SpeechGrammarList grammars;
-};
-
-// The object representing a speech grammar
-[Exposed=Window]
-interface SpeechGrammar {
-    constructor();
-    attribute DOMString src;
-    attribute float weight;
-};
-
-// The object representing a speech grammar collection
-[Exposed=Window]
-interface SpeechGrammarList {
-    constructor();
-    readonly attribute unsigned long length;
-    getter SpeechGrammar item(unsigned long index);
-    undefined addFromURI(DOMString src,
-                    optional float weight = 1.0);
-    undefined addFromString(DOMString string,
-                    optional float weight = 1.0);
-};
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 3e2a8f0a..f3ae1840 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -65,7 +65,7 @@
         "@types/yargs": "^17.0.33",
         "@webref/css": "6.23.1",
         "@webref/elements": "^2.4.0",
-        "@webref/idl": "3.65.0",
+        "@webref/idl": "3.65.1",
         "c8": "10.1.3",
         "chai": "4.5.0",
         "chai-as-promised": "8.0.1",
@@ -5386,9 +5386,9 @@
       "license": "MIT"
     },
     "node_modules/@webref/idl": {
-      "version": "3.65.0",
-      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.65.0.tgz",
-      "integrity": "sha512-TW2xliNxoHIwnZ4KNBoTnff1kQETI2KPbCYj2nyslE9bfwZdkh1gLuzYmSlYyjt5KIhpE6Wf3M4EwbGviyMUEA==",
+      "version": "3.65.1",
+      "resolved": "https://registry.npmjs.org/@webref/idl/-/idl-3.65.1.tgz",
+      "integrity": "sha512-Ky9KUy7ZVKjUUBZCxLOFNLvUwEkBF/UC/6Tcxn3LL8t5MxnVeXWf/FJly+RrgYSbmOTZIMmkItnXAsc/DaB0Kg==",
       "dev": true,
       "license": "MIT",
       "peerDependencies": {
diff --git a/package.json b/package.json
index b65b2f7c..25a6e52f 100644
--- a/package.json
+++ b/package.json
@@ -99,7 +99,7 @@
     "@types/yargs": "^17.0.33",
     "@webref/css": "6.23.1",
     "@webref/elements": "^2.4.0",
-    "@webref/idl": "3.65.0",
+    "@webref/idl": "3.65.1",
     "c8": "10.1.3",
     "chai": "4.5.0",
     "chai-as-promised": "8.0.1",