diff --git a/src/pages/dormitory/_TopIllustContainer.astro b/src/pages/dormitory/_TopIllustContainer.astro
index 02c3760f9..202db04c2 100644
--- a/src/pages/dormitory/_TopIllustContainer.astro
+++ b/src/pages/dormitory/_TopIllustContainer.astro
@@ -6,5 +6,11 @@ const { image } = dormitoryTopIllustInfos[dormitoryTopIllustInfos.length - 1];
 ---
 
 <div class="container is-max-desktop">
-  <Image src={image} alt="トップイラスト" style="object-fit: contain" />
+  <Image
+    src={image}
+    alt="トップイラスト"
+    width={1024}
+    densities={[1, 1.5]}
+    style={{ objectFit: "contain", display: "block" }}
+  />
 </div>
diff --git a/src/pages/nemo/index.astro b/src/pages/nemo/index.astro
index 240b51887..750106962 100644
--- a/src/pages/nemo/index.astro
+++ b/src/pages/nemo/index.astro
@@ -30,6 +30,8 @@ const voicevoxIconImageUrl = `url(${(await getImage({ src: voicevoxIconImage }))
           <Image
             src={teaserImage}
             alt="VOICEVOX Nemoを利用中のソフトウェアのスクリーンショット"
+            width={720}
+            densities={[1, 1.5]}
             style={{ objectFit: "contain", display: "block" }}
           />
         </div>
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