diff --git a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/config/modules/function/RegionFormatConfig.java b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/config/modules/function/RegionFormatConfig.java
index f184adb..dab13f2 100644
--- a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/config/modules/function/RegionFormatConfig.java
+++ b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/config/modules/function/RegionFormatConfig.java
@@ -10,7 +10,7 @@ import io.nanachiyo0721.shiroha.config.flags.DoNotLoad;
 import io.nanachiyo0721.shiroha.config.flags.HotReloadUnsupported;
 import io.nanachiyo0721.shiroha.enums.EnumConfigCategory;
 import io.nanachiyo0721.shiroha.enums.EnumRegionFormat;
-import io.nanachiyo0721.shiroha.utils.BufferedLinearRegionFileFlusher;
+import io.nanachiyo0721.shiroha.data.BufferedLinearRegionFileFlusher;
 import net.minecraft.server.MinecraftServer;
 import org.jetbrains.annotations.Nullable;
 
diff --git a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFile.java b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFile.java
index 5b1d439..a5d8645 100644
--- a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFile.java
+++ b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFile.java
@@ -4,7 +4,6 @@ import ca.spottedleaf.concurrentutil.util.ConcurrentUtil;
 import ca.spottedleaf.moonrise.patches.chunk_system.io.MoonriseRegionFileIO;
 import com.github.luben.zstd.Zstd;
 import com.github.luben.zstd.ZstdInputStream;
-import io.nanachiyo0721.shiroha.utils.BufferedLinearRegionFileFlusher;
 import net.jpountz.lz4.LZ4Compressor;
 import net.jpountz.lz4.LZ4Factory;
 import net.jpountz.lz4.LZ4FastDecompressor;
diff --git a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/BufferedLinearRegionFileFlusher.java b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFileFlusher.java
similarity index 97%
rename from shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/BufferedLinearRegionFileFlusher.java
rename to shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFileFlusher.java
index e29836a..082a08c 100644
--- a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/BufferedLinearRegionFileFlusher.java
+++ b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFileFlusher.java
@@ -1,10 +1,9 @@
-package io.nanachiyo0721.shiroha.utils;
+package io.nanachiyo0721.shiroha.data;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import com.mojang.logging.LogUtils;
 import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 import it.unimi.dsi.fastutil.objects.ObjectArraySet;
-import io.nanachiyo0721.shiroha.data.BufferedLinearRegionFile;
 import org.apache.commons.lang3.Validate;
 import org.slf4j.Logger;