diff --git a/src/web/app/common/views/components/url-preview.vue b/src/web/app/common/views/components/url-preview.vue
index 91f0a85fb3..e91e510550 100644
--- a/src/web/app/common/views/components/url-preview.vue
+++ b/src/web/app/common/views/components/url-preview.vue
@@ -1,6 +1,6 @@
 <template>
 <iframe v-if="youtubeId" type="text/html" height="250"
-	:src="`http://www.youtube.com/embed/${youtubeId}?origin=${misskeyUrl}`"
+	:src="`https://www.youtube.com/embed/${youtubeId}?origin=${misskeyUrl}`"
 	frameborder="0"/>
 <div v-else>
 	<a class="mk-url-preview" :href="url" target="_blank" :title="url" v-if="!fetching">