diff --git a/src/routes/api/v2/license/+server.ts b/src/routes/api/v2/license/+server.ts
index 761aea5..b21644f 100644
--- a/src/routes/api/v2/license/+server.ts
+++ b/src/routes/api/v2/license/+server.ts
@@ -50,6 +50,17 @@ export const POST: RequestHandler = async ({ request }) => {
 		throw error(400, 'key does not belong to specified user');
 	}
 
+	// Record that this active key was validated. A failure to record the
+	// timestamp should not fail an otherwise valid validation.
+	try {
+		await prisma.licenseKey.update({
+			where: { id: storedKey.id },
+			data: { lastValidatedAt: new Date() }
+		});
+	} catch (err) {
+		console.error('Failed to record license key validation:', err);
+	}
+
 	return jsonOk(
 		serializeLicense({
 			key: storedKey.key,
diff --git a/src/routes/api/v2/license/server.spec.ts b/src/routes/api/v2/license/server.spec.ts
index 3770aa4..3fde419 100644
--- a/src/routes/api/v2/license/server.spec.ts
+++ b/src/routes/api/v2/license/server.spec.ts
@@ -4,7 +4,7 @@ import { _clearRateLimits } from '$lib/server/v2-rate-limit';
 
 vi.mock('$lib/db', () => ({
 	prisma: {
-		licenseKey: { findFirst: vi.fn() },
+		licenseKey: { findFirst: vi.fn(), update: vi.fn() },
 		user: { findUnique: vi.fn() }
 	}
 }));
@@ -15,6 +15,7 @@ import { POST } from './+server';
 type POSTEvent = Parameters<typeof POST>[0];
 
 const mockKeyFindFirst = prisma.licenseKey.findFirst as ReturnType<typeof vi.fn>;
+const mockKeyUpdate = prisma.licenseKey.update as ReturnType<typeof vi.fn>;
 const mockUserFindUnique = prisma.user.findUnique as ReturnType<typeof vi.fn>;
 
 function licenseRequest(body: unknown): Request {
@@ -66,6 +67,10 @@ describe('POST /api/v2/license', () => {
 			email_address: 'user@example.com'
 		});
 		expect(Object.keys(body)).not.toContain('subscription_level');
+		expect(mockKeyUpdate).toHaveBeenCalledWith({
+			where: { id: storedKey.id },
+			data: { lastValidatedAt: expect.any(Date) }
+		});
 	});
 
 	it('rejects a missing license_key', async () => {
@@ -104,6 +109,7 @@ describe('POST /api/v2/license', () => {
 			400,
 			'license key is not active'
 		);
+		expect(mockKeyUpdate).not.toHaveBeenCalled();
 	});
 
 	it('rejects a nonexistent user', async () => {