diff --git a/.changeset/soft-suits-swim.md b/.changeset/soft-suits-swim.md
new file mode 100644
index 000000000..7fe95af0a
--- /dev/null
+++ b/.changeset/soft-suits-swim.md
@@ -0,0 +1,5 @@
+---
+'@lion/ui': patch
+---
+
+[form-core] make sure renamed Required validator are identified as such, while remaining compatible with multiple versions
diff --git a/packages/ui/components/form-core/src/validate/ValidateMixin.js b/packages/ui/components/form-core/src/validate/ValidateMixin.js
index 0e595596e..ae5ed857f 100644
--- a/packages/ui/components/form-core/src/validate/ValidateMixin.js
+++ b/packages/ui/components/form-core/src/validate/ValidateMixin.js
@@ -420,6 +420,22 @@ export const ValidateMixinImplementation = superclass =>
       await this.__executeValidators();
     }
 
+    /**
+     * @param {Validator} validator
+     * @returns {boolean}
+     */
+    #isInstanceOfRequiredValidator(validator) {
+      // walk prototype and check if validatorName is 'Required'
+      let validatorLvlInPrototype = validator;
+      while (validatorLvlInPrototype) {
+        const ctor = /** @type {typeof Validator} */ (validatorLvlInPrototype.constructor);
+        if (ctor.validatorName === 'Required') return true;
+
+        validatorLvlInPrototype = Object.getPrototypeOf(validatorLvlInPrototype);
+      }
+      return false;
+    }
+
     /**
      * @desc step a1-3 + b (as explained in `validate()`)
      */
@@ -482,7 +498,7 @@ export const ValidateMixinImplementation = superclass =>
       for (const v of this._allValidators) {
         if (/** @type {MetaValidator} */ (v)?.executeOnResults) {
           metaValidators.push(/** @type {MetaValidator} */ (v));
-        } else if (/** @type {typeof Validator} */ (v.constructor)?.validatorName === 'Required') {
+        } else if (this.#isInstanceOfRequiredValidator(v)) {
           // Required validator was already handled
         } else if (/** @type {typeof Validator} */ (v.constructor).async) {
           asyncValidators.push(v);
diff --git a/packages/ui/components/form-core/test-suites/ValidateMixin.suite.js b/packages/ui/components/form-core/test-suites/ValidateMixin.suite.js
index af8914abd..f65db5128 100644
--- a/packages/ui/components/form-core/test-suites/ValidateMixin.suite.js
+++ b/packages/ui/components/form-core/test-suites/ValidateMixin.suite.js
@@ -130,6 +130,7 @@ export function runValidateMixinSuite(customConfig) {
         expect(el.hasFeedbackFor).to.deep.equal(['error']);
       });
 
+      // TODO: keep this use case for backwards compatibility or just required extending Required?
       it('determines whether the "Required" validator was already handled by judging the validatorName', async () => {
         class BundledValidator extends EventTarget {
           static ['_$isValidator$'] = true;
@@ -163,9 +164,7 @@ export function runValidateMixinSuite(customConfig) {
         }
 
         class BundledRequired extends BundledValidator {
-          static get validatorName() {
-            return 'Required';
-          }
+          static validatorName = 'Required';
         }
 
         const el = /** @type {ValidateElement} */ (
@@ -180,6 +179,23 @@ export function runValidateMixinSuite(customConfig) {
         expect(el.hasFeedbackFor).to.deep.equal([]);
       });
 
+      it('determines whether the "Required" validator was already handled by judging the validatorName', async () => {
+        class MyRequired extends Required {
+          static validatorName = 'SomethingOtherThanRequired';
+        }
+
+        const el = /** @type {ValidateElement} */ (
+          await fixture(html`
+            <${tag}
+            .validators=${[new MyRequired()]}
+            .modelValue=${'myValue'}
+          >${lightDom}</${tag}>
+          `)
+        );
+
+        expect(el.hasFeedbackFor).to.deep.equal([]);
+      });
+
       it('determines whether the passed Validators are ResultValidators judging by the presence of "executeOnResults"', async () => {
         class ValidateElementWithSuccessType extends ValidateElement {
           static get validationTypes() {