diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index f49980d..3558797 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -40,6 +40,9 @@ jobs:
           SENTRY_URL: ${{ secrets.SENTRY_URL }}
           SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
           VITE_APP_VERSION: ${{ github.event.release.tag_name }}
+          # This appears to be necessary to stop Vite from OOMing
+          # https://github.com/vitejs/vite/issues/2433
+          NODE_OPTIONS: "--max-old-space-size=16384"
 
       - name: Create Tarball
         env:
diff --git a/package.json b/package.json
index 4ecc42d..f7fc0e1 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "i18next-http-backend": "^1.4.4",
     "lodash": "^4.17.21",
     "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#042f2ed76c501c10dde98a31732fd92d862e2187",
-    "matrix-widget-api": "^1.0.0",
+    "matrix-widget-api": "^1.3.1",
     "mermaid": "^8.13.8",
     "normalize.css": "^8.0.1",
     "pako": "^2.0.4",
diff --git a/src/room/useGroupCall.ts b/src/room/useGroupCall.ts
index 553d418..392445f 100644
--- a/src/room/useGroupCall.ts
+++ b/src/room/useGroupCall.ts
@@ -216,7 +216,7 @@ export function useGroupCall(
     ];
 
     for (const mediaAction of mediaActions) {
-      navigator.mediaSession.setActionHandler(
+      navigator.mediaSession?.setActionHandler(
         mediaAction,
         doNothingMediaActionCallback
       );
@@ -224,7 +224,7 @@ export function useGroupCall(
 
     return () => {
       for (const mediaAction of mediaActions) {
-        navigator.mediaSession.setActionHandler(mediaAction, null);
+        navigator.mediaSession?.setActionHandler(mediaAction, null);
       }
     };
   }, [doNothingMediaActionCallback]);
diff --git a/yarn.lock b/yarn.lock
index 58b450a..e25096f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10562,10 +10562,10 @@ matrix-events-sdk@0.0.1:
     unhomoglyph "^1.0.6"
     uuid "9"
 
-matrix-widget-api@^1.0.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/matrix-widget-api/-/matrix-widget-api-1.1.1.tgz#d3fec45033d0cbc14387a38ba92dac4dbb1be962"
-  integrity sha512-gNSgmgSwvOsOcWK9k2+tOhEMYBiIMwX95vMZu0JqY7apkM02xrOzUBuPRProzN8CnbIALH7e3GAhatF6QCNvtA==
+matrix-widget-api@^1.3.1:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/matrix-widget-api/-/matrix-widget-api-1.3.1.tgz#e38f404c76bb15c113909505c1c1a5b4d781c2f5"
+  integrity sha512-+rN6vGvnXm+fn0uq9r2KWSL/aPtehD6ObC50jYmUcEfgo8CUpf9eUurmjbRlwZkWq3XHXFuKQBUCI9UzqWg37Q==
   dependencies:
     "@types/events" "^3.0.0"
     events "^3.2.0"