diff --git a/Commons.iml b/Commons.iml
index bcd242c..a4fff0e 100644
--- a/Commons.iml
+++ b/Commons.iml
@@ -23,7 +23,7 @@
     <orderEntry type="library" name="Maven: org.apache.commons:commons-lang3:3.1" level="project" />
     <orderEntry type="library" name="Maven: commons-io:commons-io:2.5" level="project" />
     <orderEntry type="library" name="Maven: joda-time:joda-time:2.9.4" level="project" />
-    <orderEntry type="library" name="Maven: com.github.theholywaffle:teamspeak3-api:1.0.14-SNAPSHOT" level="project" />
+    <orderEntry type="library" name="Maven: com.github.theholywaffle:teamspeak3-api:1.0.13" level="project" />
     <orderEntry type="library" name="Maven: org.apache.logging.log4j:log4j-api:2.6.2" level="project" />
     <orderEntry type="library" name="Maven: org.apache.logging.log4j:log4j-core:2.6.2" level="project" />
     <orderEntry type="library" name="Maven: net.gpedro.integrations.slack:slack-webhook:1.2.1" level="project" />
diff --git a/pom.xml b/pom.xml
index 337d1f0..46de0d1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -70,13 +70,17 @@
     </build>
 
     <repositories>
-        <repository>
+        <!--<repository>
             <id>TeamSpeak-3-Java-API-mvn-repo</id>
             <url>https://raw.githubusercontent.com/TheHolyWaffle/TeamSpeak-3-Java-API/mvn-repo/</url>
             <snapshots>
                 <enabled>true</enabled>
                 <updatePolicy>always</updatePolicy>
             </snapshots>
+        </repository>-->
+        <repository>
+            <id>univentoEU</id>
+            <url>http://dev.joethei.de:8081/repository/public/</url>
         </repository>
     </repositories>
 
@@ -135,7 +139,7 @@
         <dependency>
             <groupId>com.github.theholywaffle</groupId>
             <artifactId>teamspeak3-api</artifactId>
-            <version>[1.0.0,2.0.0)</version>
+            <version>1.0.13</version>
         </dependency>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
diff --git a/src/main/java/eu/univento/commons/security/SecurityHandler.java b/src/main/java/eu/univento/commons/security/SecurityHandler.java
index 575d64b..6271057 100644
--- a/src/main/java/eu/univento/commons/security/SecurityHandler.java
+++ b/src/main/java/eu/univento/commons/security/SecurityHandler.java
@@ -2,7 +2,9 @@ package eu.univento.commons.security;
 
 import eu.univento.commons.Commons;
 
+import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.function.Consumer;
 
 /**
@@ -13,18 +15,27 @@ public class SecurityHandler {
 
     private Commons commons;
 
+    private ArrayList<String> cache = new ArrayList<>();
+
     public SecurityHandler(Commons commons) {
         this.commons = commons;
-    }
-
-    public void isValidServer(String ip, Consumer<Boolean> consumer) {
-        commons.getDatabaseManager().getAsyncMySQL().query("SELECT * FROM Servers WHERE ip='" + ip + "';", resultSet -> {
+        load(resultSet -> {
             try {
-                consumer.accept(resultSet.next());
+                while (resultSet.next()) {
+                    cache.add(resultSet.getString("ip"));
+                }
+                resultSet.close();
             } catch (SQLException e) {
                 e.printStackTrace();
-                consumer.accept(false);
             }
         });
     }
+
+    public boolean isValidServer(String ip) {
+        return cache.contains(ip);
+    }
+
+    private void load(Consumer<ResultSet> consumer) {
+        commons.getDatabaseManager().getAsyncMySQL().query("SELECT * FROM Servers;", consumer);
+    }
 }
\ No newline at end of file