diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e89d809..3306145 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
   build:
     strategy:
       matrix:
-        minecraft: [ "1.19.2", "1.20.1", "1.20.4", "1.21" ]
+        minecraft: [ "1.19.2", "1.20.1", "1.20.4", "1.21.1" ]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
diff --git a/common/src/main/java/cn/zbx1425/worldcomment/data/CommentCommand.java b/common/src/main/java/cn/zbx1425/worldcomment/data/CommentCommand.java
index 7ce963d..b0ed7d5 100644
--- a/common/src/main/java/cn/zbx1425/worldcomment/data/CommentCommand.java
+++ b/common/src/main/java/cn/zbx1425/worldcomment/data/CommentCommand.java
@@ -44,7 +44,7 @@ public static void executeCommandServer(CommentEntry comment, ServerWorldData wo
                     case "domainisnot" -> predicateIsPositive = false;
                     default -> { return; }
                 };
-                ImageUploader uploader = ImageUploader.parseUploaderList(Main.SERVER_CONFIG.parseUploaderConfig()).getFirst();
+                ImageUploader uploader = ImageUploader.parseUploaderList(Main.SERVER_CONFIG.parseUploaderConfig()).get(0);
                 for (CommentEntry commentEntry : worldData.comments.timeIndex.values()) {
                     if (commentEntry.image.url.isEmpty()) continue;
                     URI imageUrl;
diff --git a/common/src/main/java/cn/zbx1425/worldcomment/data/persist/FileSerializer.java b/common/src/main/java/cn/zbx1425/worldcomment/data/persist/FileSerializer.java
index 7e37870..b099580 100644
--- a/common/src/main/java/cn/zbx1425/worldcomment/data/persist/FileSerializer.java
+++ b/common/src/main/java/cn/zbx1425/worldcomment/data/persist/FileSerializer.java
@@ -84,7 +84,7 @@ public void update(CommentEntry existingEntry) throws IOException {
     public void updateRegion(List<CommentEntry> regionEntries) throws IOException {
         synchronized (this) {
             if (regionEntries.isEmpty()) return;
-            CommentEntry pivot = regionEntries.getFirst();
+            CommentEntry pivot = regionEntries.get(0);
             try {
                 Files.createDirectory(getLevelPath(pivot.level));
             } catch (FileAlreadyExistsException ignored) {