diff --git a/component/viewer/build.gradle b/component/viewer/build.gradle
index 30bd5372..8bce2d39 100644
--- a/component/viewer/build.gradle
+++ b/component/viewer/build.gradle
@@ -58,4 +58,7 @@ dependencies {
 
     implementation project(':component:common')
 
+    // TODO-rca: バージョンカタログに切り出す
+    implementation "com.hendraanggrian.material:collapsingtoolbarlayout-subtitle:1.10.0"
+
 }
\ No newline at end of file