diff --git a/apps/web/modules/ee/contacts/lib/attribute-storage.ts b/apps/web/modules/ee/contacts/lib/attribute-storage.ts
index 7c9716ab5bb0..81671b11716f 100644
--- a/apps/web/modules/ee/contacts/lib/attribute-storage.ts
+++ b/apps/web/modules/ee/contacts/lib/attribute-storage.ts
@@ -54,7 +54,6 @@ export const prepareNewSDKAttributeForStorage = (
 };
 
 const handleStringType = (value: TRawValue): TAttributeStorageColumns => {
-  // String type - only use value column
   let stringValue: string;
 
   if (value instanceof Date) {
diff --git a/apps/web/modules/ee/contacts/lib/attributes.test.ts b/apps/web/modules/ee/contacts/lib/attributes.test.ts
index 1e57bd488107..1bd612876cd3 100644
--- a/apps/web/modules/ee/contacts/lib/attributes.test.ts
+++ b/apps/web/modules/ee/contacts/lib/attributes.test.ts
@@ -437,4 +437,22 @@ describe("updateAttributes", () => {
     expect(result.success).toBe(true);
     expect(result.messages).toContainEqual({ code: "email_or_userid_required", params: {} });
   });
+
+  test("coerces boolean attribute values to strings", async () => {
+    vi.mocked(getContactAttributeKeys).mockResolvedValue(attributeKeys);
+    vi.mocked(getContactAttributes).mockResolvedValue({ name: "Jane", email: "jane@example.com" });
+    vi.mocked(hasEmailAttribute).mockResolvedValue(false);
+    vi.mocked(hasUserIdAttribute).mockResolvedValue(false);
+    vi.mocked(prisma.$transaction).mockResolvedValue(undefined);
+    vi.mocked(prisma.contactAttribute.deleteMany).mockResolvedValue({ count: 0 });
+
+    const attributes = { name: true, email: "john@example.com" };
+    const result = await updateAttributes(contactId, userId, environmentId, attributes);
+
+    expect(result.success).toBe(true);
+    expect(prisma.$transaction).toHaveBeenCalled();
+    const transactionCall = vi.mocked(prisma.$transaction).mock.calls[0][0];
+    // Both name (coerced from boolean) and email should be upserted
+    expect(transactionCall).toHaveLength(2);
+  });
 });
diff --git a/apps/web/modules/ee/contacts/lib/attributes.ts b/apps/web/modules/ee/contacts/lib/attributes.ts
index ddc66a88477b..61f4c13d80c1 100644
--- a/apps/web/modules/ee/contacts/lib/attributes.ts
+++ b/apps/web/modules/ee/contacts/lib/attributes.ts
@@ -130,7 +130,12 @@ export const updateAttributes = async (
   const messages: TAttributeUpdateMessage[] = [];
   const errors: TAttributeUpdateMessage[] = [];
 
-  // Convert email and userId to strings for lookup (they should always be strings, but handle numbers gracefully)
+  // Coerce boolean values to strings (SDK may send booleans for string attributes)
+  const coercedAttributes: Record<string, string | number> = {};
+  for (const [key, value] of Object.entries(contactAttributesParam)) {
+    coercedAttributes[key] = typeof value === "boolean" ? String(value) : value;
+  }
+
   const emailValue =
     contactAttributesParam.email === null || contactAttributesParam.email === undefined
       ? null
@@ -154,7 +159,7 @@ export const updateAttributes = async (
   const userIdExists = !!existingUserIdAttribute;
 
   // Remove email and/or userId from attributes if they already exist on another contact
-  let contactAttributes = { ...contactAttributesParam };
+  let contactAttributes = { ...coercedAttributes };
 
   // Determine what the final email and userId values will be after this update
   // Only consider a value as "submitted" if it was explicitly included in the attributes
diff --git a/packages/types/contact-attribute.ts b/packages/types/contact-attribute.ts
index 777b5ededfaf..238defb2afa6 100644
--- a/packages/types/contact-attribute.ts
+++ b/packages/types/contact-attribute.ts
@@ -16,5 +16,5 @@ export type TContactAttribute = z.infer<typeof ZContactAttribute>;
 export const ZContactAttributes = z.record(z.string());
 export type TContactAttributes = z.infer<typeof ZContactAttributes>;
 
-export const ZContactAttributesInput = z.record(z.union([z.string(), z.number()]));
+export const ZContactAttributesInput = z.record(z.union([z.string(), z.number(), z.boolean()]));
 export type TContactAttributesInput = z.infer<typeof ZContactAttributesInput>;