diff --git a/src/main/java/CredentialRepository.java b/src/main/java/CredentialRepository.java
index 7b5dab2..a1837f2 100644
--- a/src/main/java/CredentialRepository.java
+++ b/src/main/java/CredentialRepository.java
@@ -60,13 +60,19 @@ public class CredentialRepository implements CredentialRepositoryInterface{
 
 
     @Override
-    public void updatePassword(int index) {
+    public void updatePassword(int index, String newPassword) {
 
+        try{
+
+        }
+        catch (IndexOutOfBoundsException outOfBoundsException)
+        {
 
+        }
 
     }
 
-    public void updateUsername(int index){
+    public void updateUsername(int index, String newUsername){
 
     }
 
diff --git a/src/main/java/CredentialRepositoryInterface.java b/src/main/java/CredentialRepositoryInterface.java
index da4696c..afff4b0 100644
--- a/src/main/java/CredentialRepositoryInterface.java
+++ b/src/main/java/CredentialRepositoryInterface.java
@@ -3,8 +3,8 @@ public interface CredentialRepositoryInterface {
     int createNewCredential(String name, String password);
     Credential getCredentialsViaName(String needle);
     Credential getCredentialsViaId(int id);
-    void updatePassword(int index);
-    void updateUsername(int index);
+    void updatePassword(int index, String newPassword);
+    void updateUsername(int indexl, String newUsername);
     void delete(int index);
 
 }
diff --git a/src/test/java/CredentialRepositoryTest.java b/src/test/java/CredentialRepositoryTest.java
index 9159b87..7ce26d3 100644
--- a/src/test/java/CredentialRepositoryTest.java
+++ b/src/test/java/CredentialRepositoryTest.java
@@ -49,13 +49,12 @@ class CredentialRepositoryTest {
 
     }
 
-}
+    @Test
+    void testUpdatePassword(){
 
+      //  this.credentialRepository.createNewCredential("mock", "mock");
+     //   this.credentialRepository.updatePassword(0);
 
-      /*
-        Exception failed = Assertions.assertThrows(Exception.class, () -> {
-            this.credentialRepository.createNewCredential(null,null);
-        });
+    }
 
-        Assertions.assertEquals("kein leeres Objekt erstellen", failed.getMessage());
-        */
\ No newline at end of file
+}