diff --git a/.yarn/cache/typescript-npm-5.4.5-8568a42232-53c879c6fa.zip b/.yarn/cache/typescript-npm-5.4.5-8568a42232-53c879c6fa.zip
deleted file mode 100644
index a84ee9078d..0000000000
Binary files a/.yarn/cache/typescript-npm-5.4.5-8568a42232-53c879c6fa.zip and /dev/null differ
diff --git a/.yarn/cache/typescript-npm-5.6.3-cc9b3687b0-ba302f8822.zip b/.yarn/cache/typescript-npm-5.6.3-cc9b3687b0-ba302f8822.zip
new file mode 100644
index 0000000000..feac5f41f6
Binary files /dev/null and b/.yarn/cache/typescript-npm-5.6.3-cc9b3687b0-ba302f8822.zip differ
diff --git a/.yarn/cache/typescript-patch-6609a90948-ade87bce23.zip b/.yarn/cache/typescript-patch-6609a90948-ade87bce23.zip
new file mode 100644
index 0000000000..8c492947d5
Binary files /dev/null and b/.yarn/cache/typescript-patch-6609a90948-ade87bce23.zip differ
diff --git a/.yarn/cache/typescript-patch-75f7179b67-2373c693f3.zip b/.yarn/cache/typescript-patch-75f7179b67-2373c693f3.zip
deleted file mode 100644
index 7a3890fb27..0000000000
Binary files a/.yarn/cache/typescript-patch-75f7179b67-2373c693f3.zip and /dev/null differ
diff --git a/apps/web/package.json b/apps/web/package.json
index ea10eee4f9..b94825c711 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -136,7 +136,7 @@
     "tailwindcss": "^3.4.15",
     "tailwindcss-animate": "^1.0.7",
     "ts-unused-exports": "^10.1.0",
-    "typescript": "^5.4.5"
+    "typescript": "^5.6.3"
   },
   "packageManager": "yarn@3.6.1",
   "engines": {
diff --git a/apps/web/src/components/equations-app/equation-task.tsx b/apps/web/src/components/equations-app/equation-task.tsx
index 4f61eeea32..7961e215f5 100644
--- a/apps/web/src/components/equations-app/equation-task.tsx
+++ b/apps/web/src/components/equations-app/equation-task.tsx
@@ -794,7 +794,7 @@ function findActions(
           }
           return op
         })
-        .filter((x) => x !== null) as Action[]
+        .filter((x) => x !== null)
     }
   }
   throw new Error('invalid input')
diff --git a/apps/web/src/components/equations-app/equations-app-v2.tsx b/apps/web/src/components/equations-app/equations-app-v2.tsx
index bc2387a47a..4e5aa695a0 100644
--- a/apps/web/src/components/equations-app/equations-app-v2.tsx
+++ b/apps/web/src/components/equations-app/equations-app-v2.tsx
@@ -138,7 +138,7 @@ function readSolved() {
       sessionStorage.getItem('serlo_gleichungs_app_solved') ?? '[]'
     )
     if (Array.isArray(state) && state.every((x) => typeof x === 'number')) {
-      return state as number[]
+      return state
     }
     return []
   } catch (e) {
diff --git a/apps/web/src/components/equations-app/equations-app.tsx b/apps/web/src/components/equations-app/equations-app.tsx
index eafb1c879b..07200b0725 100644
--- a/apps/web/src/components/equations-app/equations-app.tsx
+++ b/apps/web/src/components/equations-app/equations-app.tsx
@@ -963,7 +963,7 @@ function findActions(
           }
           return op
         })
-        .filter((x) => x !== null) as Action[]
+        .filter((x) => x !== null)
     }
   }
   throw new Error('invalid input')
diff --git a/apps/web/src/fetcher/create-breadcrumbs.tsx b/apps/web/src/fetcher/create-breadcrumbs.tsx
index 209bd50359..157c77b28e 100644
--- a/apps/web/src/fetcher/create-breadcrumbs.tsx
+++ b/apps/web/src/fetcher/create-breadcrumbs.tsx
@@ -59,9 +59,7 @@ export function taxonomyParentsToRootToBreadcrumbsData(
 
   // get the subject from the secondary menu data so we link to the correct landing pages
   const subject = secondaryMenus.find(
-    // this is probably a bug in our code, but for now we ignore it:
-    // eslint-disable-next-line no-constant-binary-expression
-    (menu) => menu.rootId === breadcrumbs[0]?.id ?? term.id
+    (menu) => menu.rootId === (breadcrumbs[0]?.id || term.id)
   )
 
   if (subject) {
diff --git a/apps/web/src/pages/___exercise_folder_dashboard/[id].tsx b/apps/web/src/pages/___exercise_folder_dashboard/[id].tsx
index a4af0b0e6c..c652006f97 100644
--- a/apps/web/src/pages/___exercise_folder_dashboard/[id].tsx
+++ b/apps/web/src/pages/___exercise_folder_dashboard/[id].tsx
@@ -1,5 +1,3 @@
-/* eslint-disable @typescript-eslint/no-unsafe-argument */
-/* eslint-disable @typescript-eslint/no-unsafe-call */
 /* eslint-disable @typescript-eslint/no-unsafe-assignment */
 /* eslint-disable @typescript-eslint/no-unsafe-member-access */
 import { faMagnifyingGlass } from '@fortawesome/free-solid-svg-icons'
@@ -235,8 +233,8 @@ export default function Page() {
                   <span className="ml-4 text-sm text-gray-500">
                     Gesamtquote:{' '}
                     {(
-                      (data.versions[start].solved! /
-                        data.versions[start].visits!) *
+                      (data.versions[start].solved /
+                        data.versions[start].visits) *
                       100
                     ).toFixed(2)}
                     %
@@ -246,7 +244,7 @@ export default function Page() {
                 data.versions[start].medianTimeCount !== undefined && (
                   <span className="ml-4 text-sm text-gray-500">
                     Median Arbeitszeit:{' '}
-                    {Math.round(data.versions[start].medianTime! / 1000 / 60)}{' '}
+                    {Math.round(data.versions[start].medianTime / 1000 / 60)}{' '}
                     min ({data.versions[start].medianTimeCount})
                   </span>
                 )}
@@ -269,8 +267,8 @@ export default function Page() {
                       <span className="ml-4 text-sm text-gray-500">
                         Gesamtquote:{' '}
                         {(
-                          (data.versions[end].solved! /
-                            data.versions[end].visits!) *
+                          (data.versions[end].solved /
+                            data.versions[end].visits) *
                           100
                         ).toFixed(2)}
                         %
@@ -280,7 +278,7 @@ export default function Page() {
                     data.versions[end].medianTimeCount !== undefined && (
                       <span className="ml-4 text-sm text-gray-500">
                         Median Arbeitszeit:{' '}
-                        {Math.round(data.versions[end].medianTime! / 1000 / 60)}{' '}
+                        {Math.round(data.versions[end].medianTime / 1000 / 60)}{' '}
                         min ({data.versions[end].medianTimeCount})
                       </span>
                     )}
@@ -328,6 +326,7 @@ export default function Page() {
                 </a>
                 ){' '}
                 {renderSolved(
+                  // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
                   entry.__id,
                   data.versions[i].start,
                   data.versions[i].end,
@@ -360,7 +359,8 @@ export default function Page() {
                   )
                 </p>
                 {entry.children
-                  ? entry.children.map((child: any) => {
+                  ? // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+                    entry.children.map((child: any) => {
                       return (
                         <p key={child.__id} className="my-2 ml-5">
                           Teilaufgabe {child.__id} (
@@ -382,6 +382,7 @@ export default function Page() {
                           </a>
                           ){' '}
                           {renderSolved(
+                            // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
                             child.__id,
                             data.versions[i].start,
                             data.versions[i].end,
diff --git a/e2e-tests/tsconfig.json b/e2e-tests/tsconfig.json
index a87ba62fe8..393337d61b 100644
--- a/e2e-tests/tsconfig.json
+++ b/e2e-tests/tsconfig.json
@@ -3,8 +3,8 @@
     "files": true
   },
   "compilerOptions": {
-    "target": "es2018",
-    "lib": ["es2018", "DOM"],
+    "target": "ES2018",
+    "lib": ["ES2018", "DOM"],
     "esModuleInterop": true,
     "module": "commonjs",
     "strictNullChecks": false,
diff --git a/packages/editor/package.json b/packages/editor/package.json
index 0b9ca57ea8..83a4b312d7 100644
--- a/packages/editor/package.json
+++ b/packages/editor/package.json
@@ -124,7 +124,7 @@
     "ts-debounce": "^4.0.0",
     "ts-jest": "^29.2.5",
     "ts-key-enum": "^2.0.13",
-    "typescript": "^5.4.5",
+    "typescript": "^5.6.3",
     "uuid": "^11.0.3",
     "vite": "^5.4.11",
     "vite-plugin-dts": "4.3.0",
diff --git a/packages/editor/src/core/sub-document/editor.tsx b/packages/editor/src/core/sub-document/editor.tsx
index af66371001..6c5d7de067 100644
--- a/packages/editor/src/core/sub-document/editor.tsx
+++ b/packages/editor/src/core/sub-document/editor.tsx
@@ -124,6 +124,7 @@ export function SubDocumentEditor({ id, pluginProps }: SubDocumentProps) {
     const defaultConfig =
       typeof plugin.config === 'function' ? plugin.config() : plugin.config
     const overrideConfig = (pluginProps && pluginProps.config) || {}
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
     const config = R.mergeDeepRight(defaultConfig, overrideConfig)
 
     const onChange = (
@@ -153,6 +154,7 @@ export function SubDocumentEditor({ id, pluginProps }: SubDocumentProps) {
 
     const isInlineChildEditor =
       Object.hasOwn(config, 'isInlineChildEditor') &&
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
       (config.isInlineChildEditor as boolean)
 
     const isTemplatePlugin = document.plugin.startsWith('type-')
@@ -176,6 +178,7 @@ export function SubDocumentEditor({ id, pluginProps }: SubDocumentProps) {
           containerRef={containerRef}
           id={id}
           focused={focused}
+          // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
           config={config}
           // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
           state={state}
diff --git a/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/blank.ts b/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/blank.ts
index 3069699f75..91dca66b38 100644
--- a/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/blank.ts
+++ b/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/blank.ts
@@ -23,7 +23,7 @@ export function isBlankActive(editor: SlateEditor) {
 
 export function getBlankElement(editor: SlateEditor): Blank | undefined {
   const [match] = Array.from(SlateEditor.nodes(editor, { match: matchBlanks }))
-  return match && (match[0] as Blank)
+  return match && match[0]
 }
 
 export function toggleBlank(editor: SlateEditor) {
diff --git a/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/link.ts b/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/link.ts
index 65d499decc..e430ca937e 100644
--- a/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/link.ts
+++ b/packages/editor/src/editor-ui/plugin-toolbar/text-controls/utils/link.ts
@@ -13,7 +13,7 @@ export function isLinkActive(editor: SlateEditor) {
 
 export function getLinkElement(editor: SlateEditor): Link | undefined {
   const [match] = Array.from(SlateEditor.nodes(editor, { match: matchLinks }))
-  return match && (match[0] as Link)
+  return match && match[0]
 }
 
 export function toggleLink(editor: SlateEditor) {
diff --git a/packages/editor/src/plugins/box/renderer.tsx b/packages/editor/src/plugins/box/renderer.tsx
index ddfd9b2c12..a6cd5c7a18 100644
--- a/packages/editor/src/plugins/box/renderer.tsx
+++ b/packages/editor/src/plugins/box/renderer.tsx
@@ -51,7 +51,7 @@ export function BoxRenderer({
   const isAttention = boxType === 'attention'
 
   const icon = boxTypeIcons[boxType] ? (
-    <FaIcon className="mr-1" icon={boxTypeIcons[boxType]!} />
+    <FaIcon className="mr-1" icon={boxTypeIcons[boxType]} />
   ) : null
 
   return (
diff --git a/packages/eslint-config/package.json b/packages/eslint-config/package.json
index 8227c534a7..1b4187160f 100644
--- a/packages/eslint-config/package.json
+++ b/packages/eslint-config/package.json
@@ -16,6 +16,6 @@
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-react": "^7.37.2",
     "eslint-plugin-react-hooks": "^5.0.0",
-    "typescript": "^5.4.5"
+    "typescript": "^5.6.3"
   }
 }
diff --git a/packages/typescript-config/base.json b/packages/typescript-config/base.json
index 3ada562945..db2159178e 100644
--- a/packages/typescript-config/base.json
+++ b/packages/typescript-config/base.json
@@ -21,7 +21,7 @@
     "resolveJsonModule": true,
     "skipLibCheck": true,
     "strict": true,
-    "target": "es6"
+    "target": "ES2018"
   },
   "exclude": ["node_modules"]
 }
diff --git a/packages/typescript-config/editor.json b/packages/typescript-config/editor.json
index 44924d9ed8..6e3e20dada 100644
--- a/packages/typescript-config/editor.json
+++ b/packages/typescript-config/editor.json
@@ -3,6 +3,7 @@
   "display": "React Library",
   "extends": "./base.json",
   "compilerOptions": {
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "target": "ES2018"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index e9e20a539d..e7db64357f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5877,7 +5877,7 @@ __metadata:
     ts-debounce: ^4.0.0
     ts-jest: ^29.2.5
     ts-key-enum: ^2.0.13
-    typescript: ^5.4.5
+    typescript: ^5.6.3
     uuid: ^11.0.3
     vite: ^5.4.11
     vite-plugin-dts: 4.3.0
@@ -5897,7 +5897,7 @@ __metadata:
     eslint-plugin-import: ^2.31.0
     eslint-plugin-react: ^7.37.2
     eslint-plugin-react-hooks: ^5.0.0
-    typescript: ^5.4.5
+    typescript: ^5.6.3
   languageName: unknown
   linkType: soft
 
@@ -6007,7 +6007,7 @@ __metadata:
     tippy.js: ^6.3.7
     ts-debounce: ^4.0.0
     ts-unused-exports: ^10.1.0
-    typescript: ^5.4.5
+    typescript: ^5.6.3
     use-query-params: ^2.2.1
   languageName: unknown
   linkType: soft
@@ -18865,13 +18865,13 @@ react-mathquill@Entkenntnis/tmp-react-mathquill:
   languageName: node
   linkType: hard
 
-"typescript@npm:^5.4.5":
-  version: 5.4.5
-  resolution: "typescript@npm:5.4.5"
+"typescript@npm:^5.6.3":
+  version: 5.6.3
+  resolution: "typescript@npm:5.6.3"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 53c879c6fa1e3bcb194b274d4501ba1985894b2c2692fa079db03c5a5a7140587a1e04e1ba03184605d35f439b40192d9e138eb3279ca8eee313c081c8bcd9b0
+  checksum: ba302f8822777ebefb28b554105f3e074466b671e7444ec6b75dadc008a62f46f373d9e57ceced1c433756d06c8b7dc569a7eefdf3a9573122a49205ff99021a
   languageName: node
   linkType: hard
 
@@ -18885,13 +18885,13 @@ react-mathquill@Entkenntnis/tmp-react-mathquill:
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@^5.4.5#~builtin<compat/typescript>":
-  version: 5.4.5
-  resolution: "typescript@patch:typescript@npm%3A5.4.5#~builtin<compat/typescript>::version=5.4.5&hash=14eedb"
+"typescript@patch:typescript@^5.6.3#~builtin<compat/typescript>":
+  version: 5.6.3
+  resolution: "typescript@patch:typescript@npm%3A5.6.3#~builtin<compat/typescript>::version=5.6.3&hash=14eedb"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 2373c693f3b328f3b2387c3efafe6d257b057a142f9a79291854b14ff4d5367d3d730810aee981726b677ae0fd8329b23309da3b6aaab8263dbdccf1da07a3ba
+  checksum: ade87bce2363ee963eed0e4ca8a312ea02c81873ebd53609bc3f6dc0a57f6e61ad7e3fb8cbb7f7ab8b5081cbee801b023f7c4823ee70b1c447eae050e6c7622b
   languageName: node
   linkType: hard