diff --git a/packages/playwright-core/src/protocol/serializers.ts b/packages/playwright-core/src/protocol/serializers.ts
index 5ceeb3bb0e..d43747237f 100644
--- a/packages/playwright-core/src/protocol/serializers.ts
+++ b/packages/playwright-core/src/protocol/serializers.ts
@@ -71,6 +71,8 @@ function innerParseSerializedValue(value: SerializedValue, handles: any[] | unde
     return new Date(value.d);
   if (value.u !== undefined)
     return new URL(value.u);
+  if (value.bi !== undefined)
+    return BigInt(value.bi);
   if (value.r !== undefined)
     return new RegExp(value.r.p, value.r.f);
 
@@ -133,6 +135,8 @@ function innerSerializeValue(value: any, handleSerializer: (value: any) => Handl
     return { n: value };
   if (typeof value === 'string')
     return { s: value };
+  if (typeof value === 'bigint')
+    return { bi: value.toString() };
   if (isError(value)) {
     const error = value;
     if ('captureStackTrace' in globalThis.Error) {
diff --git a/packages/playwright-core/src/protocol/validator.ts b/packages/playwright-core/src/protocol/validator.ts
index 378d8bda70..c7aa380f7f 100644
--- a/packages/playwright-core/src/protocol/validator.ts
+++ b/packages/playwright-core/src/protocol/validator.ts
@@ -57,6 +57,7 @@ scheme.SerializedValue = tObject({
   v: tOptional(tEnum(['null', 'undefined', 'NaN', 'Infinity', '-Infinity', '-0'])),
   d: tOptional(tString),
   u: tOptional(tString),
+  bi: tOptional(tString),
   r: tOptional(tObject({
     p: tString,
     f: tString,
diff --git a/packages/playwright-core/src/server/isomorphic/utilityScriptSerializers.ts b/packages/playwright-core/src/server/isomorphic/utilityScriptSerializers.ts
index c65b68b8e4..f356bf6906 100644
--- a/packages/playwright-core/src/server/isomorphic/utilityScriptSerializers.ts
+++ b/packages/playwright-core/src/server/isomorphic/utilityScriptSerializers.ts
@@ -19,6 +19,7 @@ export type SerializedValue =
     { v: 'null' | 'undefined' | 'NaN' | 'Infinity' | '-Infinity' | '-0' } |
     { d: string } |
     { u: string } |
+    { bi: string } |
     { r: { p: string, f: string} } |
     { a: SerializedValue[], id: number } |
     { o: { k: string, v: SerializedValue }[], id: number } |
@@ -91,6 +92,8 @@ export function source() {
         return new Date(value.d);
       if ('u' in value)
         return new URL(value.u);
+      if ('bi' in value)
+        return BigInt(value.bi);
       if ('r' in value)
         return new RegExp(value.r.p, value.r.f);
       if ('a' in value) {
@@ -157,6 +160,8 @@ export function source() {
       return value;
     if (typeof value === 'string')
       return value;
+    if (typeof value === 'bigint')
+      return { bi: value.toString() };
 
     if (isError(value)) {
       const error = value;
diff --git a/packages/protocol/src/channels.ts b/packages/protocol/src/channels.ts
index 76cee1e207..d008c2c005 100644
--- a/packages/protocol/src/channels.ts
+++ b/packages/protocol/src/channels.ts
@@ -179,6 +179,7 @@ export type SerializedValue = {
   v?: 'null' | 'undefined' | 'NaN' | 'Infinity' | '-Infinity' | '-0',
   d?: string,
   u?: string,
+  bi?: string,
   r?: {
     p: string,
     f: string,
diff --git a/packages/protocol/src/protocol.yml b/packages/protocol/src/protocol.yml
index 7be9a814cd..12eed0c925 100644
--- a/packages/protocol/src/protocol.yml
+++ b/packages/protocol/src/protocol.yml
@@ -80,6 +80,8 @@ SerializedValue:
     d: string?
     # String representation of the URL.
     u: string?
+    # String representation of BigInt.
+    bi: string?
     # Regular expression pattern and flags.
     r:
       type: object?
diff --git a/tests/page/page-evaluate.spec.ts b/tests/page/page-evaluate.spec.ts
index d6af07678f..db1120d6fe 100644
--- a/tests/page/page-evaluate.spec.ts
+++ b/tests/page/page-evaluate.spec.ts
@@ -94,6 +94,11 @@ it('should transfer arrays as arrays, not objects', async ({ page }) => {
   expect(result).toBe(true);
 });
 
+it('should transfer bigint', async ({ page }) => {
+  expect(await page.evaluate(() => 42n)).toBe(42n);
+  expect(await page.evaluate(a => a, 17n)).toBe(17n);
+});
+
 it('should transfer maps as empty objects', async ({ page }) => {
   const result = await page.evaluate(a => a.x.constructor.name + ' ' + JSON.stringify(a.x), { x: new Map([[1, 2]]) });
   expect(result).toBe('Object {}');