diff --git a/pom.xml b/pom.xml
index a97e4b1..cd48b43 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,7 +10,7 @@
     </parent>
     <groupId>de.samply</groupId>
     <artifactId>directory_sync_service</artifactId>
-    <version>1.5.4</version>
+    <version>1.5.5</version>
     <name>directory_sync_service</name>
     <description>Directory sync</description>
     <url>https://github.com/samply/directory_sync_service</url>
diff --git a/src/main/java/de/samply/directory_sync_service/directory/DirectoryCalls.java b/src/main/java/de/samply/directory_sync_service/directory/DirectoryCalls.java
index c47a500..b3cda34 100644
--- a/src/main/java/de/samply/directory_sync_service/directory/DirectoryCalls.java
+++ b/src/main/java/de/samply/directory_sync_service/directory/DirectoryCalls.java
@@ -88,7 +88,9 @@ public boolean endpointExists(String endpoint) {
   protected String executeRequest(HttpUriRequest request) {
     String result = null;
     try {
+      logger.debug("executeRequest: execute request" );
       CloseableHttpResponse response = httpClient.execute(request);
+      logger.debug("executeRequest: request executed" );
       if (response.getStatusLine().getStatusCode() < 300) {
         HttpEntity httpEntity = response.getEntity();
         if (httpEntity == null)
diff --git a/src/main/java/de/samply/directory_sync_service/directory/MergeDirectoryCollectionGetToDirectoryCollectionPut.java b/src/main/java/de/samply/directory_sync_service/directory/MergeDirectoryCollectionGetToDirectoryCollectionPut.java
index e4e1b97..9c5aaf3 100644
--- a/src/main/java/de/samply/directory_sync_service/directory/MergeDirectoryCollectionGetToDirectoryCollectionPut.java
+++ b/src/main/java/de/samply/directory_sync_service/directory/MergeDirectoryCollectionGetToDirectoryCollectionPut.java
@@ -53,7 +53,7 @@ public static boolean merge(DirectoryCollectionGet directoryCollectionGet, Direc
    * @return The DirectoryCollectionPut object with merged data, or null if an exception occurs.
    */
   private static DirectoryCollectionPut merge(String collectionId, DirectoryCollectionGet directoryCollectionGet, DirectoryCollectionPut directoryCollectionPut) {
-    logger.info("Merging DirectoryCollectionGet into DirectoryCollectionPut for collectionId: " + collectionId);
+    logger.debug("Merging DirectoryCollectionGet into DirectoryCollectionPut for collectionId: " + collectionId);
     try {
       directoryCollectionPut.setName(collectionId, directoryCollectionGet.getName(collectionId));
       directoryCollectionPut.setDescription(collectionId, directoryCollectionGet.getDescription(collectionId));
diff --git a/src/main/java/de/samply/directory_sync_service/directory/graphql/DirectoryCallsGraphql.java b/src/main/java/de/samply/directory_sync_service/directory/graphql/DirectoryCallsGraphql.java
index b69e79e..00310b0 100644
--- a/src/main/java/de/samply/directory_sync_service/directory/graphql/DirectoryCallsGraphql.java
+++ b/src/main/java/de/samply/directory_sync_service/directory/graphql/DirectoryCallsGraphql.java
@@ -49,7 +49,9 @@ public boolean endpointIsValidGraphql(String endpoint) {
     logger.debug("endpointIsValidGraphql: url: " + url);
     HttpGet request = new HttpGet(url);
 
+    logger.debug("endpointIsValidGraphql: execute request");
     String response = executeRequest(request);
+    logger.debug("endpointIsValidGraphql: finished executing request");
     if (response == null) {
       logger.warn("endpointIsValidGraphql: HTTP response is null");
       return false;
@@ -57,12 +59,15 @@ public boolean endpointIsValidGraphql(String endpoint) {
 
     try {
       // Use gson to turn the response into a JSON object
+      logger.debug("endpointIsValidGraphql: turn response into JSON");
       JsonObject jsonResponse = gson.fromJson(response, JsonObject.class);
       if (jsonResponse == null) {
         logger.warn("endpointIsValidGraphql: jsonResponse is null");
         return false;
       }
 
+      logger.debug("endpointIsValidGraphql: check response for error");
+
       // Check if the response contains an error
       if (jsonResponse.has("errors")) {
         logger.warn("endpointIsValidGraphql: jsonResponse has the following errors:");
@@ -77,6 +82,8 @@ public boolean endpointIsValidGraphql(String endpoint) {
       return false;
     }
 
+    logger.debug("endpointIsValidGraphql: all good, returning true");
+
     return true;
   }