diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 7f53819fbd2..25c1075a7ec 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -95,7 +95,6 @@
         "jquery-migrate": "^4.0.2",
         "json5": "^2.2.2",
         "lit-html": "^3.3.3",
-        "lodash": "^4.18.1",
         "luxon": "^3.7.2",
         "mdx-embed": "^1.1.2",
         "mime": "^4.1.0",
@@ -144,7 +143,6 @@
         "@types/hotwired__turbo": "^8.0.10",
         "@types/jquery": "^4.0.1",
         "@types/jquery-migrate": "^3.3.3",
-        "@types/lodash": "^4.17.24",
         "@types/mousetrap": "^1.6.3",
         "@types/node": "^25.9.1",
         "@types/pako": "^2.0.4",
@@ -7024,13 +7022,6 @@
       "integrity": "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==",
       "dev": true
     },
-    "node_modules/@types/lodash": {
-      "version": "4.17.24",
-      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.17.24.tgz",
-      "integrity": "sha512-gIW7lQLZbue7lRSWEFql49QJJWThrTFFeIMJdp3eH4tKoxm1OvEPg02rm4wCCSHS0cL3/Fizimb35b7k8atwsQ==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@types/mousetrap": {
       "version": "1.6.15",
       "resolved": "https://registry.npmjs.org/@types/mousetrap/-/mousetrap-1.6.15.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index db301968acd..8c67af92571 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -22,7 +22,6 @@
     "@types/hotwired__turbo": "^8.0.10",
     "@types/jquery": "^4.0.1",
     "@types/jquery-migrate": "^3.3.3",
-    "@types/lodash": "^4.17.24",
     "@types/mousetrap": "^1.6.3",
     "@types/node": "^25.9.1",
     "@types/pako": "^2.0.4",
@@ -141,7 +140,6 @@
     "jquery-migrate": "^4.0.2",
     "json5": "^2.2.2",
     "lit-html": "^3.3.3",
-    "lodash": "^4.18.1",
     "luxon": "^3.7.2",
     "mdx-embed": "^1.1.2",
     "mime": "^4.1.0",
diff --git a/frontend/src/app/core/setup/init-vendors.ts b/frontend/src/app/core/setup/init-vendors.ts
index e22dbf32f04..e6e7d3446fa 100644
--- a/frontend/src/app/core/setup/init-vendors.ts
+++ b/frontend/src/app/core/setup/init-vendors.ts
@@ -30,9 +30,6 @@
 //
 // dependencies required by classic (Rails) and Angular application.
 
-// Lodash
-import lodash from 'lodash';
-
 import moment from 'moment';
 import './init-moment-locales';
 
@@ -42,12 +39,5 @@ import '@openproject/primer-view-components/app/assets/javascripts/primer_view_c
 import URI from 'urijs';
 import 'urijs/src/URITemplate';
 
-declare global {
-  interface Window {
-    _:typeof lodash;
-  }
-}
-
-window._ = lodash;
 window.moment = moment;
 window.URI = URI;
diff --git a/frontend/src/test-setup.ts b/frontend/src/test-setup.ts
index 1f790269d7e..6722f6db937 100644
--- a/frontend/src/test-setup.ts
+++ b/frontend/src/test-setup.ts
@@ -1,5 +1,4 @@
 import { I18n } from 'i18n-js';
-import lodash from 'lodash';
 import '@testing-library/jest-dom/vitest';
 import { afterEach, vi } from 'vitest';
 import { registerDialogStreamAction } from 'core-turbo/dialog-stream-action';
@@ -15,11 +14,6 @@ afterEach(() => {
 
 window.I18n = new I18n();
 
-// Production code expects `_` to be available globally (set in init-vendors.ts).
-// Mirror that here so production modules pulled in by spec compilation can run.
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-(window as any)._ = lodash;
-
 // jsdom does not implement CSS.escape; production helpers (e.g. getMetaElement)
 // call it unconditionally.
 if (typeof CSS === 'undefined' || typeof CSS.escape !== 'function') {
diff --git a/frontend/src/typings/shims.d.ts b/frontend/src/typings/shims.d.ts
index f4f9959e862..be31ebb7027 100644
--- a/frontend/src/typings/shims.d.ts
+++ b/frontend/src/typings/shims.d.ts
@@ -14,7 +14,6 @@
 import { Injector } from '@angular/core';
 
 import { OpenProject } from 'core-app/core/setup/globals/openproject';
-import * as TLodash from 'lodash';
 import { Screenfull } from 'screenfull';
 import { ErrorReporterBase } from 'core-app/core/errors/error-reporter-base';
 import { I18n } from 'i18n-js';
@@ -24,7 +23,6 @@ declare module 'dom-autoscroller';
 declare module 'core-vendor/enjoyhint';
 
 declare global {
-  const _:typeof TLodash;
   const I18n:I18n;
 }