diff --git a/package-lock.json b/package-lock.json
index c1f1862a..726c7d45 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -64,7 +64,7 @@
 				"stylelint-config-prettier": "^9.0.5",
 				"ts-jest": "^29.0.5",
 				"ts-unused-exports": "^8.0.5",
-				"typescript": "^4.6.3",
+				"typescript": "^5.6.2",
 				"web-ext": "^7.4.0",
 				"xo": "^0.48.0"
 			}
@@ -16983,16 +16983,16 @@
 			}
 		},
 		"node_modules/typescript": {
-			"version": "4.9.4",
-			"resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.4.tgz",
-			"integrity": "sha512-Uz+dTXYzxXXbsFpM86Wh3dKCxrQqUcVMxwU54orwlJjOpO3ao8L7j5lH+dWfTwgCwIuM9GQ2kvVotzYJMXTBZg==",
+			"version": "5.6.2",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.6.2.tgz",
+			"integrity": "sha512-NW8ByodCSNCwZeghjN3o+JX5OFH0Ojg6sadjEKY4huZ52TqbJTJnDo5+Tw98lSy63NZvi4n+ez5m2u5d4PkZyw==",
 			"dev": true,
 			"bin": {
 				"tsc": "bin/tsc",
 				"tsserver": "bin/tsserver"
 			},
 			"engines": {
-				"node": ">=4.2.0"
+				"node": ">=14.17"
 			}
 		},
 		"node_modules/unbox-primitive": {
@@ -19108,6 +19108,20 @@
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/xo/node_modules/typescript": {
+			"version": "4.9.5",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
+			"integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
+			"dev": true,
+			"inBundle": true,
+			"bin": {
+				"tsc": "bin/tsc",
+				"tsserver": "bin/tsserver"
+			},
+			"engines": {
+				"node": ">=4.2.0"
+			}
+		},
 		"node_modules/xo/node_modules/yallist": {
 			"version": "4.0.0",
 			"dev": true,
@@ -31793,9 +31807,9 @@
 			}
 		},
 		"typescript": {
-			"version": "4.9.4",
-			"resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.4.tgz",
-			"integrity": "sha512-Uz+dTXYzxXXbsFpM86Wh3dKCxrQqUcVMxwU54orwlJjOpO3ao8L7j5lH+dWfTwgCwIuM9GQ2kvVotzYJMXTBZg==",
+			"version": "5.6.2",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.6.2.tgz",
+			"integrity": "sha512-NW8ByodCSNCwZeghjN3o+JX5OFH0Ojg6sadjEKY4huZ52TqbJTJnDo5+Tw98lSy63NZvi4n+ez5m2u5d4PkZyw==",
 			"dev": true
 		},
 		"unbox-primitive": {
@@ -33177,6 +33191,13 @@
 					"integrity": "sha512-yGSza74xk0UG8k+pLh5oeoYirvIiWo5t0/o3zHHAO2tRDiZcxWP7fywNlXhqb6/r6sWvwi+RsyQMWhVLe4BVuA==",
 					"dev": true
 				},
+				"typescript": {
+					"version": "4.9.5",
+					"resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
+					"integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
+					"bundled": true,
+					"dev": true
+				},
 				"yallist": {
 					"version": "4.0.0",
 					"bundled": true,
diff --git a/package.json b/package.json
index bf626893..7c400a64 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
 		"lint:css": "stylelint src/**/*.css",
 		"lint:js": "xo",
 		"lint": "run-p lint:* check-types",
-		"pretest": "NODE_ENV=test run-p lint:* unused-exports build:mv3",
+		"pretest": "NODE_ENV=test run-p lint unused-exports build:mv3",
 		"test": "jest --runInBand",
 		"watch": "parcel watch src/mv2/manifest.json --dist-dir dist-mv2 --no-cache --no-hmr",
 		"watch:mv3": "parcel watch src/mv3/manifest.json --dist-dir dist-mv3 --no-cache --no-hmr",
@@ -268,7 +268,7 @@
 		"stylelint-config-prettier": "^9.0.5",
 		"ts-jest": "^29.0.5",
 		"ts-unused-exports": "^8.0.5",
-		"typescript": "^4.6.3",
+		"typescript": "^5.6.2",
 		"web-ext": "^7.4.0",
 		"xo": "^0.48.0"
 	},
diff --git a/src/content/actions/scroll.ts b/src/content/actions/scroll.ts
index 1c057dd6..f8a283e9 100644
--- a/src/content/actions/scroll.ts
+++ b/src/content/actions/scroll.ts
@@ -5,16 +5,6 @@ import { getSetting } from "../settings/settingsManager";
 
 const DEFAULT_SCROLL_FACTOR = 0.66;
 
-// Officially "instant" is not part of the specification yet, although it works
-// in Firefox, Chrome and Safari.
-declare global {
-	interface ScrollToOptions {
-		left?: number;
-		top?: number;
-		behavior?: "auto" | "instant" | "smooth";
-	}
-}
-
 let lastScrollContainer: Element | undefined;
 let lastScrollFactor: number;
 
diff --git a/src/content/content.ts b/src/content/content.ts
index aac1e1e9..9306a80a 100644
--- a/src/content/content.ts
+++ b/src/content/content.ts
@@ -39,7 +39,9 @@ async function isWrongFrame(request: RequestFromBackground) {
 browser.runtime.onMessage.addListener(
 	async (
 		request: RequestFromBackground
-	): Promise<string | string[] | TalonAction[] | boolean | undefined> => {
+	): Promise<
+		string | number | string[] | TalonAction[] | boolean | undefined
+	> => {
 		if (await isWrongFrame(request)) return;
 
 		if ("target" in request) {
diff --git a/src/content/utils/combineArrays.ts b/src/content/utils/combineArrays.ts
index d48d5523..09e9cf60 100644
--- a/src/content/utils/combineArrays.ts
+++ b/src/content/utils/combineArrays.ts
@@ -71,7 +71,7 @@ function odometerIncrement<T>(odometer: number[], arrayOfArrays: T[][]) {
 
 		if (odometer[iOdometerDigit]! + 1 <= maxee) {
 			// Increment, and you're done...
-			odometer[iOdometerDigit]++;
+			odometer[iOdometerDigit]!++;
 			return true;
 		}