diff --git a/xwords4/android/app/build.gradle b/xwords4/android/app/build.gradle
index ad96ea300..319f92bfd 100644
--- a/xwords4/android/app/build.gradle
+++ b/xwords4/android/app/build.gradle
@@ -80,7 +80,7 @@ android {
         } else {
             minSdkVersion 14
         }
-        targetSdkVersion 31     // must match ../build.gradle
+        targetSdkVersion 30     // must match ../build.gradle
         versionCode VERSION_CODE_BASE
         versionName VERSION_NAME
     }
diff --git a/xwords4/android/build.gradle b/xwords4/android/build.gradle
index 4660d6692..523c749bd 100644
--- a/xwords4/android/build.gradle
+++ b/xwords4/android/build.gradle
@@ -32,7 +32,7 @@ subprojects {
     afterEvaluate {project ->
         if (project.hasProperty("android")) {
             android {
-                compileSdkVersion 31 // must match app/build.gradle
+                compileSdkVersion 30 // must match app/build.gradle
             }
         }
     }