diff --git a/playwright/plugins/homeserver/dendrite/index.ts b/playwright/plugins/homeserver/dendrite/index.ts
index 603bd360a8..0ddaecc1b7 100644
--- a/playwright/plugins/homeserver/dendrite/index.ts
+++ b/playwright/plugins/homeserver/dendrite/index.ts
@@ -29,7 +29,6 @@ const dendriteConfigFile = "dendrite.yaml";
 
 // Surprisingly, Dendrite implements the same register user Admin API Synapse, so we can just extend it
 export class Dendrite extends Synapse implements Homeserver, HomeserverInstance {
-    public config: HomeserverConfig & { serverId: string };
     protected image = "matrixdotorg/dendrite-monolith:main";
     protected entrypoint = "/usr/bin/dendrite";
 
diff --git a/playwright/tsconfig.json b/playwright/tsconfig.json
index 48ff1f8c02..5f3083fd57 100644
--- a/playwright/tsconfig.json
+++ b/playwright/tsconfig.json
@@ -1,8 +1,8 @@
 {
     "compilerOptions": {
-        "target": "es2018",
+        "target": "es2022",
         "jsx": "react",
-        "lib": ["ESNext", "es2021", "dom", "dom.iterable"],
+        "lib": ["ESNext", "es2022", "dom", "dom.iterable"],
         "resolveJsonModule": true,
         "esModuleInterop": true,
         "moduleResolution": "node",
diff --git a/src/@types/global.d.ts b/src/@types/global.d.ts
index e42e83d58d..fab9791ada 100644
--- a/src/@types/global.d.ts
+++ b/src/@types/global.d.ts
@@ -144,69 +144,14 @@ declare global {
         usageDetails?: { [key: string]: number };
     }
 
-    // https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvas
-    interface OffscreenCanvas {
-        convertToBlob(opts?: { type?: string; quality?: number }): Promise<Blob>;
-    }
-
-    interface HTMLAudioElement {
-        type?: string;
-    }
-
-    interface HTMLVideoElement {
-        type?: string;
-    }
-
-    // Add Chrome-specific `instant` ScrollBehaviour
-    type _ScrollBehavior = ScrollBehavior | "instant";
-
-    interface _ScrollOptions {
-        behavior?: _ScrollBehavior;
-    }
-
-    interface _ScrollIntoViewOptions extends _ScrollOptions {
-        block?: ScrollLogicalPosition;
-        inline?: ScrollLogicalPosition;
-    }
-
     interface Element {
         // Safari & IE11 only have this prefixed: we used prefixed versions
         // previously so let's continue to support them for now
         webkitRequestFullScreen(options?: FullscreenOptions): Promise<void>;
         msRequestFullscreen(options?: FullscreenOptions): Promise<void>;
-        scrollIntoView(arg?: boolean | _ScrollIntoViewOptions): void;
+        // scrollIntoView(arg?: boolean | _ScrollIntoViewOptions): void;
     }
 
-    interface Error {
-        // Standard
-        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause
-        cause?: unknown;
-
-        // Non-standard
-        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/fileName
-        fileName?: string;
-        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/lineNumber
-        lineNumber?: number;
-        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/columnNumber
-        columnNumber?: number;
-    }
-
-    // We can remove these pieces if we ever update to `target: "es2022"` in our
-    // TypeScript config which supports the new `cause` property, see
-    // https://github.com/vector-im/element-web/issues/24913
-    interface ErrorOptions {
-        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause
-        cause?: unknown;
-    }
-
-    interface ErrorConstructor {
-        new (message?: string, options?: ErrorOptions): Error;
-        (message?: string, options?: ErrorOptions): Error;
-    }
-
-    // eslint-disable-next-line no-var
-    var Error: ErrorConstructor;
-
     // https://github.com/microsoft/TypeScript/issues/28308#issuecomment-650802278
     interface AudioWorkletProcessor {
         readonly port: MessagePort;
diff --git a/src/utils/MegolmExportEncryption.ts b/src/utils/MegolmExportEncryption.ts
index de6ffea5f1..fc0958c179 100644
--- a/src/utils/MegolmExportEncryption.ts
+++ b/src/utils/MegolmExportEncryption.ts
@@ -20,7 +20,7 @@ import { logger } from "matrix-js-sdk/src/logger";
 import { _t } from "../languageHandler";
 import SdkConfig from "../SdkConfig";
 
-const subtleCrypto = window.crypto.subtle || window.crypto.webkitSubtle;
+const subtleCrypto = window.crypto.subtle;
 
 /**
  * Make an Error object which has a friendlyText property which is already
diff --git a/tsconfig.json b/tsconfig.json
index 3118f598c4..788ee414cb 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,7 +6,7 @@
         "esModuleInterop": true,
         "module": "es2022",
         "moduleResolution": "node",
-        "target": "es2018",
+        "target": "es2021",
         "noUnusedLocals": true,
         "sourceMap": false,
         "outDir": "./lib",