diff --git a/package.json b/package.json
index 84f3b19b..a8b17e87 100644
--- a/package.json
+++ b/package.json
@@ -107,8 +107,8 @@
     "@fortawesome/free-solid-svg-icons": "^6.7.2",
     "@sveltejs/kit": "^2.20.7",
     "dayjs": "^1.11.13",
+    "es-toolkit": "^1.35.0",
     "journalize": "^2.6.0",
-    "lodash-es": "^4.17.21",
     "marked": "^15.0.7",
     "marked-smartypants": "^1.1.9",
     "proper-url-join": "^2.1.2",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b7963b1f..4d85af0c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -14,21 +14,18 @@ importers:
       '@fortawesome/free-solid-svg-icons':
         specifier: ^6.7.2
         version: 6.7.2
-      '@splidejs/svelte-splide':
-        specifier: ^0.2.9
-        version: 0.2.9
       '@sveltejs/kit':
         specifier: ^2.20.7
         version: 2.20.7(@sveltejs/vite-plugin-svelte@5.0.3(svelte@5.28.0)(vite@6.3.2(@types/node@22.10.7)(jiti@2.4.2)(sass@1.86.3)(yaml@2.7.0)))(svelte@5.28.0)(vite@6.3.2(@types/node@22.10.7)(jiti@2.4.2)(sass@1.86.3)(yaml@2.7.0))
       dayjs:
         specifier: ^1.11.13
         version: 1.11.13
+      es-toolkit:
+        specifier: ^1.35.0
+        version: 1.35.0
       journalize:
         specifier: ^2.6.0
         version: 2.6.0
-      lodash-es:
-        specifier: ^4.17.21
-        version: 4.17.21
       marked:
         specifier: ^15.0.7
         version: 15.0.7
@@ -856,12 +853,6 @@ packages:
     cpu: [x64]
     os: [win32]
 
-  '@splidejs/splide@4.1.4':
-    resolution: {integrity: sha512-5I30evTJcAJQXt6vJ26g2xEkG+l1nXcpEw4xpKh0/FWQ8ozmAeTbtniVtVmz2sH1Es3vgfC4SS8B2X4o5JMptA==}
-
-  '@splidejs/svelte-splide@0.2.9':
-    resolution: {integrity: sha512-04ekJnDIJKEAhklKQMhkg4Yx0Ihtkk18eA9JeHPON0lDTngQxlOYdEYTJWH2UON45VxmVqoLHv04I++JphO36w==}
-
   '@storybook/addon-actions@8.6.12':
     resolution: {integrity: sha512-B5kfiRvi35oJ0NIo53CGH66H471A3XTzrfaa6SxXEJsgxxSeKScG5YeXcCvLiZfvANRQ7QDsmzPUgg0o3hdMXw==}
     peerDependencies:
@@ -1949,8 +1940,8 @@ packages:
     resolution: {integrity: sha512-w+5mJ3GuFL+NjVtJlvydShqE1eN3h3PbI7/5LAsYJP/2qtuMXjfL2LpHSRqo4b4eSF5K/DH1JXKUAHSB2UW50g==}
     engines: {node: '>= 0.4'}
 
-  es-toolkit@1.31.0:
-    resolution: {integrity: sha512-vwS0lv/tzjM2/t4aZZRAgN9I9TP0MSkWuvt6By+hEXfG/uLs8yg2S1/ayRXH/x3pinbLgVJYT+eppueg3cM6tg==}
+  es-toolkit@1.35.0:
+    resolution: {integrity: sha512-kVHyrRoC0eLc1hWJ6npG8nNFtOG+nWfcMI+XE0RaFO0gxd6Ions8r0O/U64QyZgY7IeidUnS5oZlRZYUgMGCAg==}
 
   es6-promise@3.3.1:
     resolution: {integrity: sha512-SOp9Phqvqn7jtEUxPWdWfWoLmyt2VaJ6MpvP9Comy1MceMXqE6bxvaTu4iaxpYYPzhny28Lc+M87/c2cPK6lDg==}
@@ -4931,12 +4922,6 @@ snapshots:
   '@rollup/rollup-win32-x64-msvc@4.40.0':
     optional: true
 
-  '@splidejs/splide@4.1.4': {}
-
-  '@splidejs/svelte-splide@0.2.9':
-    dependencies:
-      '@splidejs/splide': 4.1.4
-
   '@storybook/addon-actions@8.6.12(storybook@8.6.12(prettier@3.5.3))':
     dependencies:
       '@storybook/global': 5.0.0
@@ -5021,7 +5006,7 @@ snapshots:
       '@storybook/svelte': 8.6.12(storybook@8.6.12(prettier@3.5.3))(svelte@5.28.0)
       '@sveltejs/vite-plugin-svelte': 5.0.3(svelte@5.28.0)(vite@6.3.2(@types/node@22.10.7)(jiti@2.4.2)(sass@1.86.3)(yaml@2.7.0))
       dedent: 1.5.3
-      es-toolkit: 1.31.0
+      es-toolkit: 1.35.0
       esrap: 1.4.3
       magic-string: 0.30.17
       storybook: 8.6.12(prettier@3.5.3)
@@ -6253,7 +6238,7 @@ snapshots:
       is-date-object: 1.1.0
       is-symbol: 1.1.1
 
-  es-toolkit@1.31.0: {}
+  es-toolkit@1.35.0: {}
 
   es6-promise@3.3.1: {}
 
diff --git a/src/components/AdSlot/OneTrust.svelte b/src/components/AdSlot/OneTrust.svelte
index d524e967..1b5d1919 100644
--- a/src/components/AdSlot/OneTrust.svelte
+++ b/src/components/AdSlot/OneTrust.svelte
@@ -1,7 +1,7 @@
 <!-- This component manages the OneTrust prefs button, so it's not permanently fixed on page... -->
 <script lang="ts">
   import { onMount } from 'svelte';
-  import throttle from 'lodash-es/throttle';
+  import { throttle } from 'es-toolkit';
 
   let lastScroll = 0;
   let showManagePreferences = true;
diff --git a/src/components/BeforeAfter/BeforeAfter.svelte b/src/components/BeforeAfter/BeforeAfter.svelte
index c3a8dc62..414497cc 100644
--- a/src/components/BeforeAfter/BeforeAfter.svelte
+++ b/src/components/BeforeAfter/BeforeAfter.svelte
@@ -1,7 +1,7 @@
 <!-- @component `BeforeAfter` [Read the docs.](https://reuters-graphics.github.io/graphics-components/?path=/docs/components-graphics-beforeafter--docs) -->
 <script lang="ts">
   import { type Snippet } from 'svelte';
-  import { throttle } from 'lodash-es';
+  import { throttle } from 'es-toolkit';
 
   import Block from '../Block/Block.svelte';
   import PaddingReset from '../PaddingReset/PaddingReset.svelte';
diff --git a/src/docs/docs-components/ThemeBuilder/Customiser/Value.jsx b/src/docs/docs-components/ThemeBuilder/Customiser/Value.jsx
index 7b4dc4c7..1b2973dc 100644
--- a/src/docs/docs-components/ThemeBuilder/Customiser/Value.jsx
+++ b/src/docs/docs-components/ThemeBuilder/Customiser/Value.jsx
@@ -1,5 +1,5 @@
 import React, { useState } from 'react';
-import { cloneDeep, set } from 'lodash-es';
+import { cloneDeep, set } from 'es-toolkit';
 
 import ColourPicker from './ColourPicker.jsx';
 
diff --git a/src/docs/docs-components/ThemeBuilder/ThemeBuilder.jsx b/src/docs/docs-components/ThemeBuilder/ThemeBuilder.jsx
index d13e974c..17d7867a 100644
--- a/src/docs/docs-components/ThemeBuilder/ThemeBuilder.jsx
+++ b/src/docs/docs-components/ThemeBuilder/ThemeBuilder.jsx
@@ -6,7 +6,7 @@ import ThemeSwitch from './ThemeSwitch/Switch';
 import { Unstyled } from '@storybook/blocks';
 // @ts-ignore scss
 import classes from './styles.module.scss';
-import { cloneDeep } from 'lodash-es';
+import { cloneDeep } from 'es-toolkit';
 import darkTheme from '../../../components/Theme/themes/dark';
 import lightTheme from '../../../components/Theme/themes/light';
 
diff --git a/src/docs/utils/parseCss.js b/src/docs/utils/parseCss.js
index 4f4af80a..e65de5e8 100644
--- a/src/docs/utils/parseCss.js
+++ b/src/docs/utils/parseCss.js
@@ -1,8 +1,8 @@
 import { compileString } from 'sass';
 import { convert } from './css-to-js/index.js';
-import { kebabCase } from 'lodash-es';
+import { kebabCase } from 'es-toolkit';
 
-export const cssStringToTableArray = (cssString, withInclude = false) => {
+export const cssStringToTableArray = (cssString = '', withInclude = false) => {
   const cssObj = convert(compileString(cssString).css);
   return Object.entries(cssObj).map(([key, value]) => {
     const className = key.replace(/_/g, '-');
@@ -22,7 +22,7 @@ export const cssStringToTableArray = (cssString, withInclude = false) => {
   });
 };
 
-export const scssVariablesToTableArray = (scssString) => {
+export const scssVariablesToTableArray = (scssString = '') => {
   const regExp = /^(\$[a-zA-Z0-9-_]+):\s*(.+)$/gm;
   const matches = scssString.matchAll(regExp);
   return Array.from(matches).map((match) => {
@@ -30,7 +30,7 @@ export const scssVariablesToTableArray = (scssString) => {
   });
 };
 
-export const extractCssColourVariables = (cssString) => {
+export const extractCssColourVariables = (cssString = '') => {
   const variableRegexp = /(--[a-zA-Z][a-zA-Z0-9-]+):\s*(.+);/g;
   const cssVariables = [...cssString.matchAll(variableRegexp)].map(
     ([_, g1, g2]) => [g2, g1]