diff --git a/packages/cli/src/components/sequoia-subscribe.js b/packages/cli/src/components/sequoia-subscribe.js
index 0244a4c..f5f2f0a 100644
--- a/packages/cli/src/components/sequoia-subscribe.js
+++ b/packages/cli/src/components/sequoia-subscribe.js
@@ -161,7 +161,7 @@ function storeSubscriberDid(did) {
 		const expires = new Date(
 			Date.now() + 365 * 24 * 60 * 60 * 1000,
 		).toUTCString();
-		document.cookie = `sequoia_did=${encodeURIComponent(did)}; expires=${expires}; path=/; SameSite=Lax`;
+		document.cookie = `sequoia_did=${encodeURIComponent(did)}; Expires=${expires}; Path=/; SameSite=Lax; Secure`;
 	} catch {
 		// Cookie write may fail in some embedded contexts
 	}
@@ -201,7 +201,7 @@ function getStoredSubscriberDid() {
 function clearSubscriberDid() {
 	try {
 		document.cookie =
-			"sequoia_did=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/; SameSite=Lax";
+			"sequoia_did=; Expires=Thu, 01 Jan 1970 00:00:00 GMT; Path=/; SameSite=Lax; Secure";
 	} catch {
 		// ignore
 	}