diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 92ebd43cc4..9b99205145 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -3,7 +3,7 @@
 {
 	"name": "CyberChef",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/javascript-node:1-18-bookworm",
+	"image": "mcr.microsoft.com/devcontainers/javascript-node:1-20-bookworm",
 
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	"features": {
diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 8a3aff54b3..a45c6a9cbc 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -15,7 +15,7 @@ jobs:
     - name: Set node version
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
 
     - name: Install
       run: |
diff --git a/.github/workflows/pull_requests.yml b/.github/workflows/pull_requests.yml
index 296e60b99a..fdadab345e 100644
--- a/.github/workflows/pull_requests.yml
+++ b/.github/workflows/pull_requests.yml
@@ -14,7 +14,7 @@ jobs:
     - name: Set node version
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
 
     - name: Install
       run: |
diff --git a/.github/workflows/releases.yml b/.github/workflows/releases.yml
index a77f4984b3..1f945bed25 100644
--- a/.github/workflows/releases.yml
+++ b/.github/workflows/releases.yml
@@ -21,7 +21,7 @@ jobs:
     - name: Set node version
       uses: actions/setup-node@v3
       with:
-        node-version: '18.x'
+        node-version: '20.x'
 
     - name: Install
       run: |
diff --git a/Dockerfile b/Dockerfile
index ba605fd719..c37826f469 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@
 # Modifier --platform=$BUILDPLATFORM limits the platform to "BUILDPLATFORM" during buildx multi-platform builds
 # This is because npm "chromedriver" package is not compatiable with all platforms
 # For more info see: https://docs.docker.com/build/building/multi-platform/#cross-compilation
-FROM --platform=$BUILDPLATFORM node:18-alpine AS builder
+FROM --platform=$BUILDPLATFORM node:20-alpine AS builder
 
 WORKDIR /app
 
diff --git a/README.md b/README.md
index 89f0371d5b..a8d8cb03ff 100755
--- a/README.md
+++ b/README.md
@@ -120,7 +120,7 @@ CyberChef is built to support
 
 ## Node.js support
 
-CyberChef is built to fully support Node.js `v16`. For more information, see the ["Node API" wiki page](https://github.com/gchq/CyberChef/wiki/Node-API)
+CyberChef is built to fully support Node.js `v20`. For more information, see the ["Node API" wiki page](https://github.com/gchq/CyberChef/wiki/Node-API)
 
 
 ## Contributing
diff --git a/babel.config.js b/babel.config.js
index deab910842..30ad89e1ab 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -22,6 +22,9 @@ module.exports = function(api) {
                     "regenerator": true
                 }
             ]
-        ]
+        ],
+        "generatorOpts": {
+            "importAttributesKeyword": "with"
+        }
     };
 };
diff --git a/package.json b/package.json
index 9191ab6f03..c09c3ebddd 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
   "browserslist": [
     "Chrome >= 50",
     "Firefox >= 38",
-    "node >= 16"
+    "node >= 20"
   ],
   "devDependencies": {
     "@babel/core": "^7.24.7",
diff --git a/src/core/ChefWorker.js b/src/core/ChefWorker.js
index a43993f925..43f595f396 100644
--- a/src/core/ChefWorker.js
+++ b/src/core/ChefWorker.js
@@ -7,7 +7,7 @@
  */
 
 import Chef from "./Chef.mjs";
-import OperationConfig from "./config/OperationConfig.json" assert {type: "json"};
+import OperationConfig from "./config/OperationConfig.json" with { type: "json" };
 import OpModules from "./config/modules/OpModules.mjs";
 import loglevelMessagePrefix from "loglevel-message-prefix";
 
diff --git a/src/core/Recipe.mjs b/src/core/Recipe.mjs
index 3ce40aa4d6..ba7c35e8f9 100755
--- a/src/core/Recipe.mjs
+++ b/src/core/Recipe.mjs
@@ -4,7 +4,7 @@
  * @license Apache-2.0
  */
 
-import OperationConfig from "./config/OperationConfig.json" assert {type: "json"};
+import OperationConfig from "./config/OperationConfig.json" with { type: "json" };
 import OperationError from "./errors/OperationError.mjs";
 import Operation from "./Operation.mjs";
 import DishError from "./errors/DishError.mjs";
diff --git a/src/core/lib/Magic.mjs b/src/core/lib/Magic.mjs
index 14111ec733..ad407de690 100644
--- a/src/core/lib/Magic.mjs
+++ b/src/core/lib/Magic.mjs
@@ -1,4 +1,4 @@
-import OperationConfig from "../config/OperationConfig.json" assert {type: "json"};
+import OperationConfig from "../config/OperationConfig.json" with { type: "json" };
 import Utils, { isWorkerEnvironment } from "../Utils.mjs";
 import Recipe from "../Recipe.mjs";
 import Dish from "../Dish.mjs";
diff --git a/src/node/api.mjs b/src/node/api.mjs
index 88b3f834ae..82b5f61e19 100644
--- a/src/node/api.mjs
+++ b/src/node/api.mjs
@@ -10,7 +10,7 @@
 
 import NodeDish from "./NodeDish.mjs";
 import NodeRecipe from "./NodeRecipe.mjs";
-import OperationConfig from "../core/config/OperationConfig.json" assert {type: "json"};
+import OperationConfig from "../core/config/OperationConfig.json" with { type: "json" };
 import { sanitise, removeSubheadingsFromArray, sentenceToCamelCase } from "./apiUtils.mjs";
 import ExcludedOperationError from "../core/errors/ExcludedOperationError.mjs";
 
diff --git a/src/web/index.js b/src/web/index.js
index 90142b3420..110f0d2bf0 100755
--- a/src/web/index.js
+++ b/src/web/index.js
@@ -17,8 +17,8 @@ import * as CanvasComponents from "../core/lib/CanvasComponents.mjs";
 
 // CyberChef
 import App from "./App.mjs";
-import Categories from "../core/config/Categories.json" assert {type: "json"};
-import OperationConfig from "../core/config/OperationConfig.json" assert {type: "json"};
+import Categories from "../core/config/Categories.json" with { type: "json" };
+import OperationConfig from "../core/config/OperationConfig.json" with { type: "json" };
 
 
 /**
diff --git a/src/web/static/sitemap.mjs b/src/web/static/sitemap.mjs
index b96047fc82..03313ac7e2 100644
--- a/src/web/static/sitemap.mjs
+++ b/src/web/static/sitemap.mjs
@@ -1,5 +1,5 @@
 import sm from "sitemap";
-import OperationConfig from "../../core/config/OperationConfig.json" assert {type: "json"};
+import OperationConfig from "../../core/config/OperationConfig.json" with { type: "json" };
 
 
 /**
diff --git a/tests/node/tests/Categories.mjs b/tests/node/tests/Categories.mjs
index e6f8bd72d9..070d78d718 100644
--- a/tests/node/tests/Categories.mjs
+++ b/tests/node/tests/Categories.mjs
@@ -1,6 +1,6 @@
 import TestRegister from "../../lib/TestRegister.mjs";
-import Categories from "../../../src/core/config/Categories.json" assert {type: "json"};
-import OperationConfig from "../../../src/core/config/OperationConfig.json" assert {type: "json"};
+import Categories from "../../../src/core/config/Categories.json" with { type: "json" };
+import OperationConfig from "../../../src/core/config/OperationConfig.json" with { type: "json" };
 import it from "../assertionHandler.mjs";
 import assert from "assert";