diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b6924528f6..84bb3d263d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -37,6 +37,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             # Workaround for yarn install timeouts, especially on Windows
             - run: yarn config set network-timeout 300000
diff --git a/.github/workflows/build_develop.yml b/.github/workflows/build_develop.yml
index 96b96c8398..2407d2e6f1 100644
--- a/.github/workflows/build_develop.yml
+++ b/.github/workflows/build_develop.yml
@@ -26,6 +26,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             - name: Install Dependencies
               run: "./scripts/layered.sh"
diff --git a/.github/workflows/static_analysis.yaml b/.github/workflows/static_analysis.yaml
index 2caa342b6b..ed0148f36c 100644
--- a/.github/workflows/static_analysis.yaml
+++ b/.github/workflows/static_analysis.yaml
@@ -21,6 +21,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             - name: Install Dependencies
               run: "./scripts/layered.sh"
@@ -43,6 +44,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             # Does not need branch matching as only analyses this layer
             - name: Install Deps
@@ -60,6 +62,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             # Needs branch matching as it inherits .stylelintrc.js from matrix-react-sdk
             - name: Install Dependencies
@@ -77,6 +80,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             # Does not need branch matching as only analyses this layer
             - name: Install Deps
@@ -94,6 +98,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             - name: Install Deps
               run: "scripts/layered.sh"
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index b654b2a3a2..01965af419 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -23,6 +23,7 @@ jobs:
               uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             - name: Install Dependencies
               run: "./scripts/layered.sh"
diff --git a/.github/workflows/update-jitsi.yml b/.github/workflows/update-jitsi.yml
index 383ed0b1c8..cf25e602e5 100644
--- a/.github/workflows/update-jitsi.yml
+++ b/.github/workflows/update-jitsi.yml
@@ -13,6 +13,7 @@ jobs:
             - uses: actions/setup-node@v4
               with:
                   cache: "yarn"
+                  node-version: "lts/*"
 
             - name: Install Deps
               run: "yarn install --frozen-lockfile"
diff --git a/src/vector/index.html b/src/vector/index.html
index f5213701cf..37a1d294bd 100644
--- a/src/vector/index.html
+++ b/src/vector/index.html
@@ -81,31 +81,6 @@
     <img src="<%= require('matrix-react-sdk/res/img/format/quote.svg').default %>" aria-hidden alt="" width="25" height="22" style="visibility: hidden; position: absolute; top: 0px; left: 0px;"/>
     <img src="<%= require('matrix-react-sdk/res/img/format/strikethrough.svg').default %>" aria-hidden alt="" width="25" height="22" style="visibility: hidden; position: absolute; top: 0px; left: 0px;"/>
 
-    <audio id="messageAudio">
-        <source src="media/message.ogg" type="audio/ogg" />
-        <source src="media/message.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="ringAudio" loop>
-        <source src="media/ring.ogg" type="audio/ogg" />
-        <source src="media/ring.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="ringbackAudio" loop>
-        <source src="media/ringback.ogg" type="audio/ogg" />
-        <source src="media/ringback.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="callendAudio">
-        <source src="media/callend.ogg" type="audio/ogg" />
-        <source src="media/callend.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="busyAudio">
-        <source src="media/busy.ogg" type="audio/ogg" />
-        <source src="media/busy.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="errorAudio">
-        <source src="media/error.ogg" type="audio/ogg" />
-        <source src="media/error.mp3" type="audio/mpeg" />
-    </audio>
-    <audio id="remoteAudio"></audio>
     <!-- let CSS themes pass constants to the app -->
     <div id="mx_theme_accentColor"></div><div id="mx_theme_secondaryAccentColor"></div><div id="mx_theme_tertiaryAccentColor"></div>
 
diff --git a/src/vector/index.ts b/src/vector/index.ts
index e4289ace5d..b2cfdf1d25 100644
--- a/src/vector/index.ts
+++ b/src/vector/index.ts
@@ -56,7 +56,8 @@ function checkBrowserFeatures(): boolean {
         return false;
     }
 
-    // Custom checks atop Modernizr because it doesn't have modern checks in it for some features we depend on.
+    // Custom checks atop Modernizr because it doesn't have checks in it for
+    // some features we depend on.
     // Modernizr requires rules to be lowercase with no punctuation.
     // ES2018: http://262.ecma-international.org/9.0/#sec-promise.prototype.finally
     window.Modernizr.addTest("promiseprototypefinally", () => typeof window.Promise?.prototype?.finally === "function");
@@ -69,6 +70,11 @@ function checkBrowserFeatures(): boolean {
     );
     // ES2019: http://262.ecma-international.org/10.0/#sec-object.fromentries
     window.Modernizr.addTest("objectfromentries", () => typeof window.Object?.fromEntries === "function");
+    // ES2024: https://tc39.es/ecma262/2024/#sec-get-regexp.prototype.unicodesets
+    window.Modernizr.addTest(
+        "regexpunicodesets",
+        () => window.RegExp?.prototype && "unicodeSets" in window.RegExp.prototype,
+    );
     // ES2024: https://402.ecma-international.org/9.0/#sec-intl.segmenter
     window.Modernizr.addTest("intlsegmenter", () => typeof window.Intl?.Segmenter === "function");