diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index bc7b26a..1c3026b 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -46,5 +46,10 @@
       <option name="name" value="maven3" />
       <option name="url" value="https://repo.maven.apache.org/maven2/" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="maven4" />
+      <option name="name" value="maven4" />
+      <option name="url" value="https://maven.maxhenkel.de/repository/public" />
+    </remote-repository>
   </component>
 </project>
\ No newline at end of file
diff --git a/src/main/java/land/chipmunk/chayapak/chomens_bot/util/PersistentDataUtilities.java b/src/main/java/land/chipmunk/chayapak/chomens_bot/util/PersistentDataUtilities.java
index 2d606bb..4fe5cc3 100644
--- a/src/main/java/land/chipmunk/chayapak/chomens_bot/util/PersistentDataUtilities.java
+++ b/src/main/java/land/chipmunk/chayapak/chomens_bot/util/PersistentDataUtilities.java
@@ -32,7 +32,6 @@ public class PersistentDataUtilities {
         init();
 
         future = Main.executor.scheduleAtFixedRate(() -> {
-            // TODO: thread-safe
             try {
                 if (queue.isEmpty()) return;
 
@@ -91,23 +90,23 @@ public class PersistentDataUtilities {
         } catch (IOException ignored) {}
     }
 
-    public static synchronized void put (String property, JsonElement value) {
-        queue.put(property, value);
+    public static void put (String property, JsonElement value) {
+        Main.executorService.submit(() -> queue.put(property, value));
     }
 
-    public static synchronized void put (String property, String value) {
-        queue.put(property, new JsonPrimitive(value));
+    public static void put (String property, String value) {
+        Main.executorService.submit(() -> queue.put(property, new JsonPrimitive(value)));
     }
 
-    public static synchronized void put (String property, boolean value) {
-        queue.put(property, new JsonPrimitive(value));
+    public static void put (String property, boolean value) {
+        Main.executorService.submit(() -> queue.put(property, new JsonPrimitive(value)));
     }
 
-    public static synchronized void put (String property, int value) {
-        queue.put(property, new JsonPrimitive(value));
+    public static void put (String property, int value) {
+        Main.executorService.submit(() -> queue.put(property, new JsonPrimitive(value)));
     }
 
-    public static synchronized void put (String property, char value) {
-        queue.put(property, new JsonPrimitive(value));
+    public static void put (String property, char value) {
+        Main.executorService.submit(() -> queue.put(property, new JsonPrimitive(value)));
     }
 }