diff --git a/DroidCafeInput/app/src/main/res/layout/content_main.xml b/DroidCafeInput/app/src/main/res/layout/content_main.xml
index 86695c33..229b4c13 100644
--- a/DroidCafeInput/app/src/main/res/layout/content_main.xml
+++ b/DroidCafeInput/app/src/main/res/layout/content_main.xml
@@ -15,7 +15,7 @@
   ~ limitations under the License.
   -->
 
-<android.support.constraint.ConstraintLayout
+<androidx.constraintlayout.widget.ConstraintLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -112,4 +112,4 @@
         app:layout_constraintStart_toEndOf="@+id/froyo"
         app:layout_constraintTop_toTopOf="@+id/froyo" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>