diff --git a/src/elements/core/dom.ts b/src/elements/core/dom.ts
index 5920d373a4..52975d08b3 100644
--- a/src/elements/core/dom.ts
+++ b/src/elements/core/dom.ts
@@ -1,9 +1,7 @@
 export * from './dom/breakpoint.js';
 export * from './dom/find-referenced-element.js';
-export * from './dom/get-document-writing-mode.js';
 export * from './dom/host-context.js';
 export * from './dom/input-element.js';
 export * from './dom/set-or-remove-attribute.js';
 export * from './dom/platform.js';
 export * from './dom/scroll.js';
-export * from './dom/ssr.js';
diff --git a/src/elements/core/dom/get-document-writing-mode.ts b/src/elements/core/dom/get-document-writing-mode.ts
deleted file mode 100644
index 32e04634aa..0000000000
--- a/src/elements/core/dom/get-document-writing-mode.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { isServer } from 'lit';
-
-/**
- * @deprecated use :dir() selector instead
- */
-export const getDocumentWritingMode = (): string =>
-  (!isServer && document.documentElement.getAttribute('dir')) || 'ltr';
diff --git a/src/elements/core/dom/ssr.ts b/src/elements/core/dom/ssr.ts
deleted file mode 100644
index b7aa96e9e3..0000000000
--- a/src/elements/core/dom/ssr.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import type { LitElement } from 'lit';
-
-const localNameCache = new Map<unknown, string>();
-
-/**
- * In SSR the local/tag name is not available on the class instance, but it is available
- * in the shim customElements registry.
- *
- * https://github.com/lit/lit/blob/main/packages/labs/ssr-dom-shim/src.ts (See CustomElementRegistryShim)
- *
- * Can be removed once https://github.com/lit/lit/pull/4553 is merged/released.
- *
- * @deprecated Will be removed with next major version
- */
-export function getLocalName(element: LitElement): string {
-  if (localNameCache.has(element.constructor)) {
-    return localNameCache.get(element.constructor)!;
-  }
-
-  const definitions = // eslint-disable-next-line @typescript-eslint/naming-convention
-    (customElements as unknown as { __definitions: Map<string, { ctor: unknown }> }).__definitions;
-  for (const [key, value] of definitions) {
-    if (value.ctor === element.constructor) {
-      localNameCache.set(element.constructor, key);
-      return key;
-    }
-  }
-  throw new Error(`Given element ${element.constructor.name} has not been registered yet.`);
-}
diff --git a/src/elements/core/eventing.ts b/src/elements/core/eventing.ts
index 3afa9c472a..cff041920a 100644
--- a/src/elements/core/eventing.ts
+++ b/src/elements/core/eventing.ts
@@ -3,6 +3,5 @@ export * from './eventing/event-emitter.js';
 export * from './eventing/event-target.js';
 export * from './eventing/form-element-handlers.js';
 export * from './eventing/forward-event.js';
-export * from './eventing/handler-repository.js';
 export * from './eventing/is-event-prevented.js';
 export * from './eventing/throttle.js';
diff --git a/src/elements/core/eventing/form-element-handlers.ts b/src/elements/core/eventing/form-element-handlers.ts
index 20545463c8..b3a5c85f2c 100644
--- a/src/elements/core/eventing/form-element-handlers.ts
+++ b/src/elements/core/eventing/form-element-handlers.ts
@@ -1,5 +1,3 @@
-import type { HandlerAspect } from './handler-repository.js';
-
 /**
  * Prevents scrolling from pressing Space
  * @param event The origin event.
@@ -9,12 +7,3 @@ export function preventScrollOnSpacebarPress(event: KeyboardEvent): void {
     event.preventDefault();
   }
 }
-
-/**
- * Handler to prevent scrolling on space bar click.
- *
- * @deprecated TODO: remove once radio button became form element
- */
-export const formElementHandlerAspect: HandlerAspect = ({ host, signal }) => {
-  host.addEventListener('keydown', preventScrollOnSpacebarPress, { signal });
-};
diff --git a/src/elements/core/eventing/handler-repository.ts b/src/elements/core/eventing/handler-repository.ts
deleted file mode 100644
index 05a5ea5a5e..0000000000
--- a/src/elements/core/eventing/handler-repository.ts
+++ /dev/null
@@ -1,45 +0,0 @@
-/**
- * @deprecated
- * TODO: remove once radio button became form element
- */
-export interface HandlerAspectParams {
-  host: HTMLElement;
-  signal: AbortSignal;
-}
-
-/**
- * @deprecated
- * TODO: remove once radio button became form element
- */
-export interface HandlerAspect {
-  (params: HandlerAspectParams): void;
-}
-
-/**
- * @deprecated
- * TODO: remove once radio button became form element
- */
-export class HandlerRepository {
-  private _aspects: HandlerAspect[];
-  private _controller?: AbortController;
-
-  public constructor(
-    private readonly _host: HTMLElement,
-    ...aspects: HandlerAspect[]
-  ) {
-    this._aspects = aspects;
-  }
-
-  public connect(): void {
-    this._controller?.abort();
-    this._controller = new AbortController();
-    const params: HandlerAspectParams = { host: this._host, signal: this._controller.signal };
-    for (const aspect of this._aspects) {
-      aspect(params);
-    }
-  }
-
-  public disconnect(): void {
-    this._controller?.abort();
-  }
-}
diff --git a/src/elements/core/mixins/disabled-mixin.ts b/src/elements/core/mixins/disabled-mixin.ts
index e6803edb63..045fe5c492 100644
--- a/src/elements/core/mixins/disabled-mixin.ts
+++ b/src/elements/core/mixins/disabled-mixin.ts
@@ -97,33 +97,3 @@ export const SbbDisabledTabIndexActionMixin = <
   > &
     T;
 };
-
-/**
- * Extends `SbbDisabledMixin` with the `aria-disabled` attribute.
- * For a11y purposes, keeps the element focusable even when disabled.
- * @deprecated Will be removed with next major version
- */
-// eslint-disable-next-line @typescript-eslint/naming-convention
-export const SbbFocusableDisabledActionMixin = <T extends AbstractConstructor<LitElement>>(
-  superClass: T,
-): AbstractConstructor<SbbDisabledMixinType> & T => {
-  abstract class SbbFocusableDisabledAction
-    extends SbbDisabledMixin(superClass)
-    implements SbbDisabledMixinType
-  {
-    protected override willUpdate(changedProperties: PropertyValues<this>): void {
-      super.willUpdate(changedProperties);
-
-      if (!changedProperties.has('disabled')) {
-        return;
-      }
-
-      if (this.disabled) {
-        this.setAttribute('aria-disabled', 'true');
-      } else {
-        this.removeAttribute('aria-disabled');
-      }
-    }
-  }
-  return SbbFocusableDisabledAction as AbstractConstructor<SbbDisabledMixinType> & T;
-};
diff --git a/src/elements/core/observers.ts b/src/elements/core/observers.ts
deleted file mode 100644
index 1c1b0d8ee2..0000000000
--- a/src/elements/core/observers.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export * from './observers/intersection-observer.js';
-export * from './observers/mutation-observer.js';
-export * from './observers/resize-observer.js';
diff --git a/src/elements/core/observers/intersection-observer.ts b/src/elements/core/observers/intersection-observer.ts
deleted file mode 100644
index 8494fb700d..0000000000
--- a/src/elements/core/observers/intersection-observer.ts
+++ /dev/null
@@ -1,31 +0,0 @@
-/**
- * @deprecated use lit observers, will be removed with next major version
- */
-export class NodeIntersectionObserver implements IntersectionObserver {
-  public root!: Element | Document | null;
-  public rootMargin!: string;
-  public thresholds!: number[];
-
-  public disconnect(): void {
-    // noop
-  }
-
-  public observe(): void {
-    // noop
-  }
-
-  public takeRecords(): any {
-    // noop
-  }
-
-  public unobserve(): void {
-    // noop
-  }
-}
-
-/**
- * @deprecated use lit observers, will be removed with next major version
- */
-// eslint-disable-next-line @typescript-eslint/naming-convention
-export const AgnosticIntersectionObserver =
-  typeof IntersectionObserver === 'undefined' ? NodeIntersectionObserver : IntersectionObserver;
diff --git a/src/elements/core/observers/mutation-observer.ts b/src/elements/core/observers/mutation-observer.ts
deleted file mode 100644
index e09862fd42..0000000000
--- a/src/elements/core/observers/mutation-observer.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * @deprecated use lit observers, will be removed with next major version
- */
-export class NodeMutationObserver implements MutationObserver {
-  public disconnect(): void {
-    // Noop
-  }
-
-  public observe(_target: Node, _options?: MutationObserverInit): void {
-    // Noop
-  }
-
-  public takeRecords(): MutationRecord[] {
-    return [];
-  }
-}
-
-/**
- * @deprecated use lit observers, will be removed with next major version
- */
-// eslint-disable-next-line @typescript-eslint/naming-convention
-export const AgnosticMutationObserver: typeof MutationObserver =
-  typeof MutationObserver === 'undefined' ? NodeMutationObserver : MutationObserver;
diff --git a/src/elements/core/observers/resize-observer.ts b/src/elements/core/observers/resize-observer.ts
deleted file mode 100644
index c11f4ba04e..0000000000
--- a/src/elements/core/observers/resize-observer.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * @deprecated use lit observers, will be removed with next major version
- */
-export class NodeResizeObserver implements ResizeObserver {
-  public disconnect(): any {
-    // noop
-  }
-
-  public observe(): any {
-    // noop
-  }
-
-  public unobserve(): any {
-    // noop
-  }
-}
-
-/**
- * @deprecated use lit observers, will be removed with next major version
- */
-// eslint-disable-next-line @typescript-eslint/naming-convention
-export const AgnosticResizeObserver =
-  typeof ResizeObserver === 'undefined' ? NodeResizeObserver : ResizeObserver;