diff --git a/.changeset/wicked-kids-unite.md b/.changeset/wicked-kids-unite.md
new file mode 100644
index 000000000..dc0322023
--- /dev/null
+++ b/.changeset/wicked-kids-unite.md
@@ -0,0 +1,5 @@
+---
+"@tma.js/sdk": patch
+---
+
+Fix miniApp.requestContact data parser
diff --git a/packages/sdk/src/mini-app/contactParser.ts b/packages/sdk/src/mini-app/contactParser.ts
index 16a15b39d..34958b82c 100644
--- a/packages/sdk/src/mini-app/contactParser.ts
+++ b/packages/sdk/src/mini-app/contactParser.ts
@@ -17,7 +17,7 @@ export const contactParser = searchParams<RequestedContact>({
       from: 'first_name',
     },
     lastName: {
-      type: string(),
+      type: string().optional(),
       from: 'last_name',
     },
   }),
diff --git a/packages/sdk/src/mini-app/types.ts b/packages/sdk/src/mini-app/types.ts
index ef370e003..820a0ba0d 100644
--- a/packages/sdk/src/mini-app/types.ts
+++ b/packages/sdk/src/mini-app/types.ts
@@ -31,7 +31,7 @@ export interface RequestedContact {
     userId: number;
     phoneNumber: string;
     firstName: string;
-    lastName: string;
+    lastName?: string;
   };
   authDate: Date;
   hash: string;