diff --git a/app/src/main/java/jp/juggler/subwaytooter/appsetting/AppSettingItem.kt b/app/src/main/java/jp/juggler/subwaytooter/appsetting/AppSettingItem.kt
index e174da2f..06d573f9 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/appsetting/AppSettingItem.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/appsetting/AppSettingItem.kt
@@ -784,7 +784,9 @@ val appSettingRoot = AppSettingItem(null, SettingType.Section, R.string.app_sett
         sw(PrefB.bpEmojioneShortcode, R.string.emojione_shortcode_support) {
             desc = R.string.emojione_shortcode_support_desc
         }
-        sw(PrefB.bpUseTwemoji, R.string.use_twemoji_emoji)
+        sw(PrefB.bpUseTwemoji, R.string.use_twemoji_emoji){
+            enabled = Build.VERSION.SDK_INT >= 31
+        }
 
         sw(PrefB.bpKeepReactionSpace, R.string.keep_reaction_space)
     }
diff --git a/app/src/main/java/jp/juggler/subwaytooter/pref/PrefB.kt b/app/src/main/java/jp/juggler/subwaytooter/pref/PrefB.kt
index fa8378de..0791c1af 100644
--- a/app/src/main/java/jp/juggler/subwaytooter/pref/PrefB.kt
+++ b/app/src/main/java/jp/juggler/subwaytooter/pref/PrefB.kt
@@ -1,5 +1,6 @@
 package jp.juggler.subwaytooter.pref
 
+import android.os.Build
 import jp.juggler.subwaytooter.pref.impl.BooleanPref
 
 object PrefB {
@@ -321,7 +322,8 @@ object PrefB {
 
     val bpUseTwemoji = BooleanPref(
         "UseTwemoji",
-        false
+        // Android 12 以上ではデフォルトfalse
+        Build.VERSION.SDK_INT < 31
     )
 
     val bpKeepReactionSpace = BooleanPref(